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d649b976d0
Original commit message: calculate builtin_object_size if argument is a removable pointer This patch fixes calculating correct value for builtin_object_size function when pointer is used only in builtin_object_size function call and never after that. Patch by Strahinja Petrovic. Differential Revision: http://reviews.llvm.org/D17337 Reland the original change with a small modification (first do a null check and then do the cast) to satisfy ubsan. llvm-svn: 263011
35 lines
979 B
LLVM
35 lines
979 B
LLVM
; RUN: opt -instcombine -S < %s | FileCheck %s
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; int foo() {
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; struct V { char buf1[10];
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; int b;
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; char buf2[10];
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; } var;
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;
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; char *p = &var.buf1[1];
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; return __builtin_object_size (p, 0);
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; }
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%struct.V = type { [10 x i8], i32, [10 x i8] }
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define i32 @foo() #0 {
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entry:
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%var = alloca %struct.V, align 4
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%0 = bitcast %struct.V* %var to i8*
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call void @llvm.lifetime.start(i64 28, i8* %0) #3
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%buf1 = getelementptr inbounds %struct.V, %struct.V* %var, i32 0, i32 0
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%arrayidx = getelementptr inbounds [10 x i8], [10 x i8]* %buf1, i64 0, i64 1
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%1 = call i64 @llvm.objectsize.i64.p0i8(i8* %arrayidx, i1 false)
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%conv = trunc i64 %1 to i32
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call void @llvm.lifetime.end(i64 28, i8* %0) #3
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ret i32 %conv
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; CHECK: ret i32 27
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; CHECK-NOT: ret i32 -1
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}
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declare void @llvm.lifetime.start(i64, i8* nocapture) #1
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declare i64 @llvm.objectsize.i64.p0i8(i8*, i1) #2
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declare void @llvm.lifetime.end(i64, i8* nocapture) #1
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