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6eafd532ab
not safe. This is fixed by more aggressively checking that the return slot is not used elsewhere in the function. llvm-svn: 47544
32 lines
1.8 KiB
LLVM
32 lines
1.8 KiB
LLVM
; RUN: llvm-as < %s | opt -gvn -dse | llvm-dis | grep {call.*initialize} | grep memtmp | count 1
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32"
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target triple = "i386-pc-linux-gnu"
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define internal fastcc void @initialize({ x86_fp80, x86_fp80 }* noalias sret %agg.result) nounwind {
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entry:
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%agg.result.03 = getelementptr { x86_fp80, x86_fp80 }* %agg.result, i32 0, i32 0 ; <x86_fp80*> [#uses=1]
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store x86_fp80 0xK00000000000000000000, x86_fp80* %agg.result.03
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%agg.result.15 = getelementptr { x86_fp80, x86_fp80 }* %agg.result, i32 0, i32 1 ; <x86_fp80*> [#uses=1]
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store x86_fp80 0xK00000000000000000000, x86_fp80* %agg.result.15
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ret void
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}
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declare fastcc x86_fp80 @passed_uninitialized({ x86_fp80, x86_fp80 }* %x) nounwind
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define fastcc void @badly_optimized() nounwind {
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entry:
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%z = alloca { x86_fp80, x86_fp80 } ; <{ x86_fp80, x86_fp80 }*> [#uses=2]
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%tmp = alloca { x86_fp80, x86_fp80 } ; <{ x86_fp80, x86_fp80 }*> [#uses=2]
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%memtmp = alloca { x86_fp80, x86_fp80 }, align 8 ; <{ x86_fp80, x86_fp80 }*> [#uses=2]
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call fastcc void @initialize( { x86_fp80, x86_fp80 }* noalias sret %memtmp )
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%tmp1 = bitcast { x86_fp80, x86_fp80 }* %tmp to i8* ; <i8*> [#uses=1]
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%memtmp2 = bitcast { x86_fp80, x86_fp80 }* %memtmp to i8* ; <i8*> [#uses=1]
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call void @llvm.memcpy.i32( i8* %tmp1, i8* %memtmp2, i32 24, i32 8 )
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%z3 = bitcast { x86_fp80, x86_fp80 }* %z to i8* ; <i8*> [#uses=1]
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%tmp4 = bitcast { x86_fp80, x86_fp80 }* %tmp to i8* ; <i8*> [#uses=1]
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call void @llvm.memcpy.i32( i8* %z3, i8* %tmp4, i32 24, i32 8 )
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%tmp5 = call fastcc x86_fp80 @passed_uninitialized( { x86_fp80, x86_fp80 }* %z ) ; <x86_fp80> [#uses=0]
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ret void
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}
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declare void @llvm.memcpy.i32(i8*, i8*, i32, i32) nounwind |