45fa0fd758
This is a fix for PR27844. When replacing uses of unsafe allocas, emit the new location immediately after each use. Without this, the pointer stays live from the function entry to the last use, while it's usually cheaper to recalculate. llvm-svn: 272969
23 lines
720 B
LLVM
23 lines
720 B
LLVM
; Test that unsafe alloca address calculation is done immediately before each use.
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; RUN: opt -safe-stack -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s
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; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s
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define void @f() safestack {
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entry:
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%x0 = alloca i32, align 4
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%x1 = alloca i32, align 4
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; CHECK: %[[A:.*]] = getelementptr i8, i8* %{{.*}}, i32 -4
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; CHECK: %[[X0:.*]] = bitcast i8* %[[A]] to i32*
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; CHECK: call void @use(i32* %[[X0]])
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call void @use(i32* %x0)
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; CHECK: %[[B:.*]] = getelementptr i8, i8* %{{.*}}, i32 -8
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; CHECK: %[[X1:.*]] = bitcast i8* %[[B]] to i32*
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; CHECK: call void @use(i32* %[[X1]])
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call void @use(i32* %x1)
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ret void
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}
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declare void @use(i32*)
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