76 lines
2.4 KiB
LLVM
76 lines
2.4 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; 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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; CHECK-LABEL: @foo(
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; CHECK-NEXT: ret i32 27
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;
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%var = alloca %struct.V, align 4
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%t0 = bitcast %struct.V* %var to i8*
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call void @llvm.lifetime.start.p0i8(i64 28, i8* %t0) #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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%t1 = call i64 @llvm.objectsize.i64.p0i8(i8* %arrayidx, i1 false)
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%conv = trunc i64 %t1 to i32
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call void @llvm.lifetime.end.p0i8(i64 28, i8* %t0) #3
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ret i32 %conv
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}
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; This used to crash while erasing instructions:
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; https://bugs.llvm.org/show_bug.cgi?id=43723
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define void @PR43723() {
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; CHECK-LABEL: @PR43723(
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; CHECK-NEXT: ret void
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;
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%tab = alloca [10 x i8], align 16
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%t0 = bitcast [10 x i8]* %tab to i8*
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call void @llvm.memset.p0i8.i64(i8* align 16 %t0, i8 9, i64 10, i1 false)
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%t1 = call {}* @llvm.invariant.start.p0i8(i64 10, i8* align 16 %t0)
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call void @llvm.invariant.end.p0i8({}* %t1, i64 10, i8* align 16 %t0)
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ret void
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uselistorder i8* %t0, { 1, 0, 2 }
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}
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define void @unknown_use_of_invariant_start({}** %p) {
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; CHECK-LABEL: @unknown_use_of_invariant_start(
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; CHECK-NEXT: ret void
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;
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%tab = alloca [10 x i8], align 16
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%t0 = bitcast [10 x i8]* %tab to i8*
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call void @llvm.memset.p0i8.i64(i8* align 16 %t0, i8 9, i64 10, i1 false)
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%t1 = call {}* @llvm.invariant.start.p0i8(i64 10, i8* align 16 %t0)
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call void @llvm.invariant.end.p0i8({}* %t1, i64 10, i8* align 16 %t0)
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store {}* %t1, {}** %p
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ret void
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}
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define {}* @minimal_invariant_start_use(i8 %x) {
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; CHECK-LABEL: @minimal_invariant_start_use(
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; CHECK-NEXT: ret {}* undef
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;
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%a = alloca i8
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%i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %a)
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ret {}* %i
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}
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declare void @llvm.lifetime.start.p0i8(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.p0i8(i64, i8* nocapture) #1
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declare void @llvm.memset.p0i8.i64(i8* nocapture writeonly, i8, i64, i1 immarg) #0
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declare {}* @llvm.invariant.start.p0i8(i64 immarg, i8* nocapture) #0
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declare void @llvm.invariant.end.p0i8({}*, i64 immarg, i8* nocapture) #0
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