8516f54e6a
This is a mostly-target-independent variadic function optimisation and lowering pass. It is only enabled for AMDGPU in this initial commit. The purpose is to make C style variadic functions a zero cost abstraction. They are lowered to equivalent IR which is then amenable to other optimisations. This is inherently slightly target specific but much less so than one might expect - the C varargs interface heavily constrains the ABI design divergence. The pass is primarily tested from webassembly. This is because wasm has a straightforward variadic lowering strategy which coincides exactly with what this pass transforms code into and a struct passing convention with few cases to check. Adding further targets conventions is straightforward and elided from this patch primarily to simplify the review. Implemented in other branches are Linux X86, AMD64, AArch64 and NVPTX. Testing for targets that have existing lowering for va_arg from clang is most efficiently done by checking that clang | opt completely elides the variadic syntax from test cases. The lowering produces a struct for each call site which can be inspected to check the various alignment and indirections are correct. AMDGPU presently has no variadic support other than some ad hoc printf handling. Combined with the pass being inactive on all other targets landing this represents strict increase in capability with zero risk. Testing and refining will continue post commit. In addition to the compiler tests included here, a self contained x64 clang/musl toolchain was constructed using the "lowering" instead of the systemv ABI and used to build various C programs like lua and libxml2.
527 lines
16 KiB
LLVM
527 lines
16 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -verify-machineinstrs | FileCheck %s
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; REQUIRES: webassembly-registered-target
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target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
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target triple = "wasm32-unknown-unknown"
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; Function Attrs: nounwind
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define void @pass_s0() {
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; CHECK-LABEL: pass_s0:
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; CHECK: .functype pass_s0 () -> ()
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; CHECK-NEXT: # %bb.0: # %entry
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; CHECK-NEXT: i32.const 0
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; CHECK-NEXT: call sink
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; CHECK-NEXT: # fallthrough-return
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entry:
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tail call void (...) @sink()
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ret void
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}
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declare void @sink(...)
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; Function Attrs: nounwind
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define void @pass_s1(i8 %x.coerce) {
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; CHECK-LABEL: pass_s1:
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; CHECK: .functype pass_s1 (i32) -> ()
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; CHECK-NEXT: .local i32
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; CHECK-NEXT: # %bb.0: # %entry
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; CHECK-NEXT: global.get __stack_pointer
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.sub
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; CHECK-NEXT: local.tee 1
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: local.get 0
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: call sink
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: # fallthrough-return
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entry:
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tail call void (...) @sink(i8 %x.coerce)
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ret void
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}
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; Function Attrs: nounwind
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define void @pass_s2(i16 %x.coerce) {
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; CHECK-LABEL: pass_s2:
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; CHECK: .functype pass_s2 (i32) -> ()
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; CHECK-NEXT: .local i32
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; CHECK-NEXT: # %bb.0: # %entry
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; CHECK-NEXT: global.get __stack_pointer
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.sub
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; CHECK-NEXT: local.tee 1
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: local.get 0
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: call sink
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: # fallthrough-return
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entry:
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tail call void (...) @sink(i16 %x.coerce)
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ret void
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}
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; Function Attrs: nounwind
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define void @pass_s3(i32 %x.coerce) {
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; CHECK-LABEL: pass_s3:
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; CHECK: .functype pass_s3 (i32) -> ()
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; CHECK-NEXT: .local i32
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; CHECK-NEXT: # %bb.0: # %entry
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; CHECK-NEXT: global.get __stack_pointer
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.sub
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; CHECK-NEXT: local.tee 1
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: local.get 0
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: call sink
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: # fallthrough-return
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entry:
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tail call void (...) @sink(i32 %x.coerce)
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ret void
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}
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; Function Attrs: nounwind
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define void @pass_s4(i64 %x.coerce) {
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; CHECK-LABEL: pass_s4:
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; CHECK: .functype pass_s4 (i64) -> ()
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; CHECK-NEXT: .local i32
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; CHECK-NEXT: # %bb.0: # %entry
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; CHECK-NEXT: global.get __stack_pointer
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.sub
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; CHECK-NEXT: local.tee 1
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: local.get 0
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; CHECK-NEXT: i64.store 0
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: call sink
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: # fallthrough-return
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entry:
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tail call void (...) @sink(i64 %x.coerce)
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ret void
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}
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; Function Attrs: nounwind
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define void @pass_s5(<4 x i32> noundef %x) {
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; CHECK-LABEL: pass_s5:
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; CHECK: .functype pass_s5 (i32, i32, i32, i32) -> ()
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; CHECK-NEXT: .local i32
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; CHECK-NEXT: # %bb.0: # %entry
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; CHECK-NEXT: global.get __stack_pointer
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.sub
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; CHECK-NEXT: local.tee 4
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: local.get 4
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; CHECK-NEXT: local.get 3
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; CHECK-NEXT: i32.store 12
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; CHECK-NEXT: local.get 4
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: i32.store 8
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; CHECK-NEXT: local.get 4
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: i32.store 4
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; CHECK-NEXT: local.get 4
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; CHECK-NEXT: local.get 0
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 4
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; CHECK-NEXT: call sink
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; CHECK-NEXT: local.get 4
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: # fallthrough-return
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entry:
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tail call void (...) @sink(<4 x i32> noundef %x)
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ret void
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}
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; Function Attrs: nounwind
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define void @pass_int_s0(i32 noundef %i) {
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; CHECK-LABEL: pass_int_s0:
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; CHECK: .functype pass_int_s0 (i32) -> ()
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; CHECK-NEXT: .local i32
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; CHECK-NEXT: # %bb.0: # %entry
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; CHECK-NEXT: global.get __stack_pointer
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.sub
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; CHECK-NEXT: local.tee 1
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: local.get 0
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: call sink
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: # fallthrough-return
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entry:
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tail call void (...) @sink(i32 noundef %i)
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ret void
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}
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; Function Attrs: nounwind
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define void @pass_int_s1(i32 noundef %i, i8 %x.coerce) {
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; CHECK-LABEL: pass_int_s1:
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; CHECK: .functype pass_int_s1 (i32, i32) -> ()
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; CHECK-NEXT: .local i32
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; CHECK-NEXT: # %bb.0: # %entry
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; CHECK-NEXT: global.get __stack_pointer
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.sub
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; CHECK-NEXT: local.tee 2
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: i32.store 4
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: local.get 0
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: call sink
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: # fallthrough-return
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entry:
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tail call void (...) @sink(i32 noundef %i, i8 %x.coerce)
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ret void
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}
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; Function Attrs: nounwind
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define void @pass_int_s2(i32 noundef %i, i16 %x.coerce) {
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; CHECK-LABEL: pass_int_s2:
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; CHECK: .functype pass_int_s2 (i32, i32) -> ()
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; CHECK-NEXT: .local i32
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; CHECK-NEXT: # %bb.0: # %entry
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; CHECK-NEXT: global.get __stack_pointer
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.sub
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; CHECK-NEXT: local.tee 2
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: i32.store 4
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: local.get 0
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: call sink
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: # fallthrough-return
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entry:
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tail call void (...) @sink(i32 noundef %i, i16 %x.coerce)
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ret void
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}
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; Function Attrs: nounwind
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define void @pass_int_s3(i32 noundef %i, i32 %x.coerce) {
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; CHECK-LABEL: pass_int_s3:
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; CHECK: .functype pass_int_s3 (i32, i32) -> ()
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; CHECK-NEXT: .local i32
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; CHECK-NEXT: # %bb.0: # %entry
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; CHECK-NEXT: global.get __stack_pointer
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.sub
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; CHECK-NEXT: local.tee 2
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: i32.store 4
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: local.get 0
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: call sink
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: # fallthrough-return
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entry:
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tail call void (...) @sink(i32 noundef %i, i32 %x.coerce)
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ret void
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}
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; Function Attrs: nounwind
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define void @pass_int_s4(i32 noundef %i, i64 %x.coerce) {
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; CHECK-LABEL: pass_int_s4:
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; CHECK: .functype pass_int_s4 (i32, i64) -> ()
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; CHECK-NEXT: .local i32
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; CHECK-NEXT: # %bb.0: # %entry
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; CHECK-NEXT: global.get __stack_pointer
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.sub
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; CHECK-NEXT: local.tee 2
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: i64.store 8
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: local.get 0
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: call sink
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: # fallthrough-return
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entry:
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tail call void (...) @sink(i32 noundef %i, i64 %x.coerce)
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ret void
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}
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; Function Attrs: nounwind
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define void @pass_int_s5(i32 noundef %i, <4 x i32> noundef %x) {
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; CHECK-LABEL: pass_int_s5:
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; CHECK: .functype pass_int_s5 (i32, i32, i32, i32, i32) -> ()
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; CHECK-NEXT: .local i32
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; CHECK-NEXT: # %bb.0: # %entry
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; CHECK-NEXT: global.get __stack_pointer
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; CHECK-NEXT: i32.const 32
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; CHECK-NEXT: i32.sub
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; CHECK-NEXT: local.tee 5
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: local.get 5
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; CHECK-NEXT: i32.const 28
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: local.get 4
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 5
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; CHECK-NEXT: i32.const 24
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: local.get 3
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 5
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; CHECK-NEXT: i32.const 20
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 5
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 5
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; CHECK-NEXT: local.get 0
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 5
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; CHECK-NEXT: call sink
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; CHECK-NEXT: local.get 5
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; CHECK-NEXT: i32.const 32
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: # fallthrough-return
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entry:
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tail call void (...) @sink(i32 noundef %i, <4 x i32> noundef %x)
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ret void
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}
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; Function Attrs: nounwind
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define void @pass_asc(i8 %x1.coerce, i16 %x2.coerce, i32 %x3.coerce, i64 %x4.coerce, <4 x i32> noundef %x5) {
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; CHECK-LABEL: pass_asc:
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; CHECK: .functype pass_asc (i32, i32, i32, i64, i32, i32, i32, i32) -> ()
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; CHECK-NEXT: .local i32
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; CHECK-NEXT: # %bb.0: # %entry
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; CHECK-NEXT: global.get __stack_pointer
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; CHECK-NEXT: i32.const 48
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; CHECK-NEXT: i32.sub
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; CHECK-NEXT: local.tee 8
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: local.get 8
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; CHECK-NEXT: i32.const 44
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: local.get 7
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 8
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; CHECK-NEXT: i32.const 40
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: local.get 6
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 8
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; CHECK-NEXT: i32.const 36
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: local.get 5
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 8
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; CHECK-NEXT: i32.const 32
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: local.get 4
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 8
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; CHECK-NEXT: i32.const 16
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: local.get 3
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; CHECK-NEXT: i64.store 0
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; CHECK-NEXT: local.get 8
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; CHECK-NEXT: local.get 2
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; CHECK-NEXT: i32.store 8
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; CHECK-NEXT: local.get 8
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; CHECK-NEXT: local.get 1
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; CHECK-NEXT: i32.store 4
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; CHECK-NEXT: local.get 8
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; CHECK-NEXT: local.get 0
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 8
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; CHECK-NEXT: call sink
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; CHECK-NEXT: local.get 8
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; CHECK-NEXT: i32.const 48
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: # fallthrough-return
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entry:
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tail call void (...) @sink(i8 %x1.coerce, i16 %x2.coerce, i32 %x3.coerce, i64 %x4.coerce, <4 x i32> noundef %x5)
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ret void
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}
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; Function Attrs: nounwind
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define void @pass_dsc(<4 x i32> noundef %x0, i64 %x1.coerce, i32 %x2.coerce, i16 %x3.coerce, i8 %x4.coerce) {
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; CHECK-LABEL: pass_dsc:
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; CHECK: .functype pass_dsc (i32, i32, i32, i32, i64, i32, i32, i32) -> ()
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; CHECK-NEXT: .local i32
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; CHECK-NEXT: # %bb.0: # %entry
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; CHECK-NEXT: global.get __stack_pointer
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; CHECK-NEXT: i32.const 48
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; CHECK-NEXT: i32.sub
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; CHECK-NEXT: local.tee 8
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; CHECK-NEXT: global.set __stack_pointer
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; CHECK-NEXT: local.get 8
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; CHECK-NEXT: i32.const 32
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: local.get 7
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 8
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; CHECK-NEXT: i32.const 28
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: local.get 6
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 8
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; CHECK-NEXT: i32.const 24
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: local.get 5
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; CHECK-NEXT: i32.store 0
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; CHECK-NEXT: local.get 8
|
|
; CHECK-NEXT: i32.const 16
|
|
; CHECK-NEXT: i32.add
|
|
; CHECK-NEXT: local.get 4
|
|
; CHECK-NEXT: i64.store 0
|
|
; CHECK-NEXT: local.get 8
|
|
; CHECK-NEXT: local.get 3
|
|
; CHECK-NEXT: i32.store 12
|
|
; CHECK-NEXT: local.get 8
|
|
; CHECK-NEXT: local.get 2
|
|
; CHECK-NEXT: i32.store 8
|
|
; CHECK-NEXT: local.get 8
|
|
; CHECK-NEXT: local.get 1
|
|
; CHECK-NEXT: i32.store 4
|
|
; CHECK-NEXT: local.get 8
|
|
; CHECK-NEXT: local.get 0
|
|
; CHECK-NEXT: i32.store 0
|
|
; CHECK-NEXT: local.get 8
|
|
; CHECK-NEXT: call sink
|
|
; CHECK-NEXT: local.get 8
|
|
; CHECK-NEXT: i32.const 48
|
|
; CHECK-NEXT: i32.add
|
|
; CHECK-NEXT: global.set __stack_pointer
|
|
; CHECK-NEXT: # fallthrough-return
|
|
entry:
|
|
tail call void (...) @sink(<4 x i32> noundef %x0, i64 %x1.coerce, i32 %x2.coerce, i16 %x3.coerce, i8 %x4.coerce)
|
|
ret void
|
|
}
|
|
|
|
; Function Attrs: nounwind
|
|
define void @pass_multiple(i32 noundef %i, i8 %x1.coerce, i16 %x2.coerce, i32 %x3.coerce, i64 %x4.coerce, <4 x i32> noundef %x5) {
|
|
; CHECK-LABEL: pass_multiple:
|
|
; CHECK: .functype pass_multiple (i32, i32, i32, i32, i64, i32, i32, i32, i32) -> ()
|
|
; CHECK-NEXT: .local i32
|
|
; CHECK-NEXT: # %bb.0: # %entry
|
|
; CHECK-NEXT: global.get __stack_pointer
|
|
; CHECK-NEXT: i32.const 48
|
|
; CHECK-NEXT: i32.sub
|
|
; CHECK-NEXT: local.tee 9
|
|
; CHECK-NEXT: global.set __stack_pointer
|
|
; CHECK-NEXT: local.get 9
|
|
; CHECK-NEXT: local.get 4
|
|
; CHECK-NEXT: i64.store 40
|
|
; CHECK-NEXT: local.get 9
|
|
; CHECK-NEXT: local.get 2
|
|
; CHECK-NEXT: i32.store 36
|
|
; CHECK-NEXT: local.get 9
|
|
; CHECK-NEXT: local.get 0
|
|
; CHECK-NEXT: i32.store 32
|
|
; CHECK-NEXT: local.get 9
|
|
; CHECK-NEXT: i32.const 32
|
|
; CHECK-NEXT: i32.add
|
|
; CHECK-NEXT: call sink
|
|
; CHECK-NEXT: local.get 9
|
|
; CHECK-NEXT: i32.const 28
|
|
; CHECK-NEXT: i32.add
|
|
; CHECK-NEXT: local.get 8
|
|
; CHECK-NEXT: i32.store 0
|
|
; CHECK-NEXT: local.get 9
|
|
; CHECK-NEXT: i32.const 24
|
|
; CHECK-NEXT: i32.add
|
|
; CHECK-NEXT: local.get 7
|
|
; CHECK-NEXT: i32.store 0
|
|
; CHECK-NEXT: local.get 9
|
|
; CHECK-NEXT: i32.const 20
|
|
; CHECK-NEXT: i32.add
|
|
; CHECK-NEXT: local.get 6
|
|
; CHECK-NEXT: i32.store 0
|
|
; CHECK-NEXT: local.get 9
|
|
; CHECK-NEXT: i32.const 16
|
|
; CHECK-NEXT: i32.add
|
|
; CHECK-NEXT: local.get 5
|
|
; CHECK-NEXT: i32.store 0
|
|
; CHECK-NEXT: local.get 9
|
|
; CHECK-NEXT: local.get 3
|
|
; CHECK-NEXT: i32.store 8
|
|
; CHECK-NEXT: local.get 9
|
|
; CHECK-NEXT: local.get 1
|
|
; CHECK-NEXT: i32.store 4
|
|
; CHECK-NEXT: local.get 9
|
|
; CHECK-NEXT: local.get 0
|
|
; CHECK-NEXT: i32.store 0
|
|
; CHECK-NEXT: local.get 9
|
|
; CHECK-NEXT: call sink
|
|
; CHECK-NEXT: local.get 9
|
|
; CHECK-NEXT: i32.const 48
|
|
; CHECK-NEXT: i32.add
|
|
; CHECK-NEXT: global.set __stack_pointer
|
|
; CHECK-NEXT: # fallthrough-return
|
|
entry:
|
|
tail call void (...) @sink(i32 noundef %i, i16 %x2.coerce, i64 %x4.coerce)
|
|
tail call void (...) @sink(i32 noundef %i, i8 %x1.coerce, i32 %x3.coerce, <4 x i32> noundef %x5)
|
|
ret void
|
|
}
|
|
|