d4207ba0f6
Summary: MRI::eliminateFrameIndex can emit several instructions to do address calculations; these can usually be stackified. Because instructions with FI operands can have subsequent operands which may be expression trees, find the top of the leftmost tree and insert the code before it, to keep the LIFO property. Also use stackified registers when writing back the SP value to memory in the epilog; it's unnecessary because SP will not be used after the epilog, and it results in better code. Differential Revision: http://reviews.llvm.org/D18234 llvm-svn: 263725
123 lines
4.8 KiB
LLVM
123 lines
4.8 KiB
LLVM
; RUN: llc < %s -asm-verbose=false -verify-machineinstrs | FileCheck %s
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; RUN: llc < %s -asm-verbose=false -verify-machineinstrs -fast-isel | FileCheck %s
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target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
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target triple = "wasm32-unknown-unknown"
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%SmallStruct = type { i32 }
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%OddStruct = type { i32, i8, i32 }
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%AlignedStruct = type { double, double }
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%BigStruct = type { double, double, double, double, double, double, double, double, double, double, double, i8, i8, i8 }
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%EmptyStruct = type { }
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%BigArray = type { [33 x i8] }
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declare void @ext_func(%SmallStruct*)
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declare void @ext_func_empty(%EmptyStruct* byval)
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declare void @ext_byval_func(%SmallStruct* byval)
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declare void @ext_byval_func_align8(%SmallStruct* byval align 8)
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declare void @ext_byval_func_alignedstruct(%AlignedStruct* byval)
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declare void @ext_byval_func_bigarray(%BigArray* byval)
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declare void @ext_byval_func_empty(%EmptyStruct* byval)
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; CHECK-LABEL: byval_arg
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define void @byval_arg(%SmallStruct* %ptr) {
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; CHECK: .param i32
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; Subtract 16 from SP (SP is 16-byte aligned)
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; CHECK: i32.const $push[[L1:.+]]=, __stack_pointer
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; CHECK-NEXT: i32.load $push[[L2:.+]]=, 0($pop[[L1]])
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; CHECK-NEXT: i32.const $push[[L3:.+]]=, 16
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; CHECK-NEXT: i32.sub [[SP:.+]]=, $pop[[L2]], $pop[[L3]]
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; Ensure SP is stored back before the call
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; CHECK-NEXT: i32.const $push[[L4:.+]]=, __stack_pointer
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; CHECK-NEXT: i32.store {{.*}}=, 0($pop[[L4]]), [[SP]]
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; Copy the SmallStruct argument to the stack (SP+12, original SP-4)
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; CHECK-NEXT: i32.load $push[[L4:.+]]=, 0($0)
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; CHECK-NEXT: i32.store {{.*}}=, 12([[SP]]), $pop[[L4]]
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; Pass a pointer to the stack slot to the function
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; CHECK-NEXT: i32.const $push[[L5:.+]]=, 12
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; CHECK-NEXT: i32.add $push[[ARG:.+]]=, [[SP]], $pop[[L5]]
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; CHECK-NEXT: call ext_byval_func@FUNCTION, $pop[[ARG]]
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call void @ext_byval_func(%SmallStruct* byval %ptr)
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; Restore the stack
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; CHECK-NEXT: i32.const $push[[L7:.+]]=, __stack_pointer
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; CHECK-NEXT: i32.const $push[[L6:.+]]=, 16
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; CHECK-NEXT: i32.add $push[[L8:.+]]=, [[SP]], $pop[[L6]]
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; CHECK-NEXT: i32.store {{.*}}=, 0($pop[[L7]]), $pop[[L8]]
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; CHECK-NEXT: return
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ret void
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}
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; CHECK-LABEL: byval_arg_align8
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define void @byval_arg_align8(%SmallStruct* %ptr) {
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; CHECK: .param i32
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; Don't check the entire SP sequence, just enough to get the alignment.
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; CHECK: i32.const $push[[L1:.+]]=, 16
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; CHECK-NEXT: i32.sub [[SP:.+]]=, {{.+}}, $pop[[L1]]
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; Copy the SmallStruct argument to the stack (SP+8, original SP-8)
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; CHECK: i32.load $push[[L4:.+]]=, 0($0):p2align=3
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; CHECK-NEXT: i32.store {{.*}}=, 8([[SP]]):p2align=3, $pop[[L4]]
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; Pass a pointer to the stack slot to the function
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; CHECK-NEXT: i32.const $push[[L5:.+]]=, 8
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; CHECK-NEXT: i32.add $push[[ARG:.+]]=, [[SP]], $pop[[L5]]
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; CHECK-NEXT: call ext_byval_func_align8@FUNCTION, $pop[[ARG]]
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call void @ext_byval_func_align8(%SmallStruct* byval align 8 %ptr)
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ret void
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}
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; CHECK-LABEL: byval_arg_double
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define void @byval_arg_double(%AlignedStruct* %ptr) {
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; CHECK: .param i32
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; Subtract 16 from SP (SP is 16-byte aligned)
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; CHECK: i32.const $push[[L1:.+]]=, 16
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; CHECK-NEXT: i32.sub [[SP:.+]]=, {{.+}}, $pop[[L1]]
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; Copy the AlignedStruct argument to the stack (SP+0, original SP-16)
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; Just check the last load/store pair of the memcpy
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; CHECK: i64.load $push[[L4:.+]]=, 0($0)
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; CHECK-NEXT: i64.store {{.*}}=, 0([[SP]]), $pop[[L4]]
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; Pass a pointer to the stack slot to the function
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; CHECK-NEXT: call ext_byval_func_alignedstruct@FUNCTION, [[SP]]
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tail call void @ext_byval_func_alignedstruct(%AlignedStruct* byval %ptr)
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ret void
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}
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; CHECK-LABEL: byval_param
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define void @byval_param(%SmallStruct* byval align 32 %ptr) {
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; CHECK: .param i32
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; %ptr is just a pointer to a struct, so pass it directly through
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; CHECK: call ext_func@FUNCTION, $0
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call void @ext_func(%SmallStruct* %ptr)
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ret void
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}
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; CHECK-LABEL: byval_empty_caller
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define void @byval_empty_caller(%EmptyStruct* %ptr) {
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; CHECK: .param i32
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; CHECK: call ext_byval_func_empty@FUNCTION, $0
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call void @ext_byval_func_empty(%EmptyStruct* byval %ptr)
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ret void
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}
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; CHECK-LABEL: byval_empty_callee
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define void @byval_empty_callee(%EmptyStruct* byval %ptr) {
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; CHECK: .param i32
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; CHECK: call ext_func_empty@FUNCTION, $0
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call void @ext_func_empty(%EmptyStruct* %ptr)
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ret void
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}
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; Call memcpy for "big" byvals.
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; CHECK-LABEL: big_byval:
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; CHECK: i32.const $push[[L1:.+]]=, __stack_pointer
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; CHECK-NEXT: i32.load $push[[L2:.+]]=, 0($pop[[L1]])
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; CHECK-NEXT: i32.const $push[[L3:.+]]=, 131072
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; CHECK-NEXT: i32.sub [[SP:.+]]=, $pop[[L2]], $pop[[L3]]
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; CHECK: i32.call ${{[^,]+}}=, memcpy@FUNCTION,
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; CHECK-NEXT: call big_byval_callee@FUNCTION,
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%big = type [131072 x i8]
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declare void @big_byval_callee(%big* byval align 1)
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define void @big_byval(%big* byval align 1 %x) {
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call void @big_byval_callee(%big* byval align 1 %x)
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ret void
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}
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