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9969458b16
This means we can do cheap DSE for heap memory. Nothing is done if the pointer excapes or has a load. The churn in the tests is mostly due to objectsize, since we want to make sure we don't delete the malloc call before evaluating the objectsize (otherwise it becomes -1/0) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159876 91177308-0d34-0410-b5e6-96231b3b80d8
42 lines
919 B
LLVM
42 lines
919 B
LLVM
; RUN: opt < %s -instcombine -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"
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target triple = "x86_64-apple-darwin10.0"
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declare noalias i8* @malloc(i64) nounwind
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declare void @free(i8*)
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; PR5130
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define i1 @test1() {
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%A = call noalias i8* @malloc(i64 4) nounwind
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%B = icmp eq i8* %A, null
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store i8 0, i8* %A
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call void @free(i8* %A)
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ret i1 %B
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; CHECK: @test1
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; CHECK: ret i1 false
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}
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; CHECK: @test2
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define noalias i8* @test2() nounwind {
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entry:
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; CHECK: @malloc
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%A = call noalias i8* @malloc(i64 4) nounwind
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; CHECK: icmp eq
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%tobool = icmp eq i8* %A, null
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; CHECK: br i1
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br i1 %tobool, label %return, label %if.end
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if.end:
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; CHECK: store
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store i8 7, i8* %A
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br label %return
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return:
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; CHECK: phi
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%retval.0 = phi i8* [ %A, %if.end ], [ null, %entry ]
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ret i8* %retval.0
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}
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