9681ea9560
Add a pass to lower is.constant and objectsize intrinsics This pass lowers is.constant and objectsize intrinsics not simplified by earlier constant folding, i.e. if the object given is not constant or if not using the optimized pass chain. The result is recursively simplified and constant conditionals are pruned, so that dead blocks are removed even for -O0. This allows inline asm blocks with operand constraints to work all the time. The new pass replaces the existing lowering in the codegen-prepare pass and fallbacks in SDAG/GlobalISEL and FastISel. The latter now assert on the intrinsics. Differential Revision: https://reviews.llvm.org/D65280 llvm-svn: 374784
84 lines
2.7 KiB
LLVM
84 lines
2.7 KiB
LLVM
; RUN: opt -lower-constant-intrinsics -S < %s | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-darwin10.0.0"
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declare i64 @llvm.objectsize.i64(i8*, i1, i1, i1) nounwind readonly
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declare i64 @llvm.objectsize.i64.p1i8(i8 addrspace(1)*, i1, i1, i1) nounwind readonly
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declare void @llvm.trap() nounwind
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; CHECK-LABEL: @test1(
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; objectsize should fold to a constant, which causes the branch to fold to an
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; uncond branch.
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define i32 @test1(i8* %ptr) nounwind ssp noredzone align 2 {
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entry:
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%0 = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false, i1 false, i1 false)
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%1 = icmp ugt i64 %0, 3
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br i1 %1, label %T, label %trap
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; CHECK: entry:
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; CHECK-NOT: label %trap
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trap: ; preds = %0, %entry
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tail call void @llvm.trap() noreturn nounwind
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unreachable
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T:
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; CHECK: ret i32 4
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ret i32 4
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}
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; CHECK-LABEL: @test_objectsize_null_flag(
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define i64 @test_objectsize_null_flag(i8* %ptr) {
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entry:
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; CHECK: ret i64 -1
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%0 = tail call i64 @llvm.objectsize.i64(i8* null, i1 false, i1 true, i1 false)
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ret i64 %0
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}
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; CHECK-LABEL: @test_objectsize_null_flag_min(
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define i64 @test_objectsize_null_flag_min(i8* %ptr) {
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entry:
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; CHECK: ret i64 0
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%0 = tail call i64 @llvm.objectsize.i64(i8* null, i1 true, i1 true, i1 false)
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ret i64 %0
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}
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; Test foldable null pointers because we evaluate them with non-exact modes in
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; CodeGenPrepare.
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; CHECK-LABEL: @test_objectsize_null_flag_noas0(
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define i64 @test_objectsize_null_flag_noas0() {
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entry:
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; CHECK: ret i64 -1
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%0 = tail call i64 @llvm.objectsize.i64.p1i8(i8 addrspace(1)* null, i1 false,
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i1 true, i1 false)
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ret i64 %0
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}
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; CHECK-LABEL: @test_objectsize_null_flag_min_noas0(
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define i64 @test_objectsize_null_flag_min_noas0() {
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entry:
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; CHECK: ret i64 0
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%0 = tail call i64 @llvm.objectsize.i64.p1i8(i8 addrspace(1)* null, i1 true,
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i1 true, i1 false)
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ret i64 %0
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}
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; CHECK-LABEL: @test_objectsize_null_known_flag_noas0
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define i64 @test_objectsize_null_known_flag_noas0() {
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entry:
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; CHECK: ret i64 -1
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%0 = tail call i64 @llvm.objectsize.i64.p1i8(i8 addrspace(1)* null, i1 false,
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i1 false, i1 false)
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ret i64 %0
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}
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; CHECK-LABEL: @test_objectsize_null_known_flag_min_noas0
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define i64 @test_objectsize_null_known_flag_min_noas0() {
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entry:
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; CHECK: ret i64 0
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%0 = tail call i64 @llvm.objectsize.i64.p1i8(i8 addrspace(1)* null, i1 true,
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i1 false, i1 false)
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ret i64 %0
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}
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