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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2; RUN: opt -passes=instcombine -S < %s | FileCheck %s3 4; int foo() {5; struct V { char buf1[10];6; int b;7; char buf2[10];8; } var;9;10; char *p = &var.buf1[1];11; return __builtin_object_size (p, 0);12; }13 14%struct.V = type { [10 x i8], i32, [10 x i8] }15 16define i32 @foo() #0 {17; CHECK-LABEL: @foo(18; CHECK-NEXT: ret i32 2719;20 %var = alloca %struct.V, align 421 call void @llvm.lifetime.start.p0(ptr %var) #322 %arrayidx = getelementptr inbounds [10 x i8], ptr %var, i64 0, i64 123 %t1 = call i64 @llvm.objectsize.i64.p0(ptr %arrayidx, i1 false)24 %conv = trunc i64 %t1 to i3225 call void @llvm.lifetime.end.p0(ptr %var) #326 ret i32 %conv27}28 29; This used to crash while erasing instructions:30; https://bugs.llvm.org/show_bug.cgi?id=4372331 32define void @PR43723() {33; CHECK-LABEL: @PR43723(34; CHECK-NEXT: ret void35;36 %tab = alloca [10 x i8], align 1637 call void @llvm.memset.p0.i64(ptr align 16 %tab, i8 9, i64 10, i1 false)38 %t1 = call ptr @llvm.invariant.start.p0(i64 10, ptr align 16 %tab)39 call void @llvm.invariant.end.p0(ptr %t1, i64 10, ptr align 16 %tab)40 ret void41 42 uselistorder ptr %tab, { 1, 0, 2 }43}44 45define void @unknown_use_of_invariant_start(ptr %p) {46; CHECK-LABEL: @unknown_use_of_invariant_start(47; CHECK-NEXT: ret void48;49 %tab = alloca [10 x i8], align 1650 call void @llvm.memset.p0.i64(ptr align 16 %tab, i8 9, i64 10, i1 false)51 %t1 = call ptr @llvm.invariant.start.p0(i64 10, ptr align 16 %tab)52 call void @llvm.invariant.end.p0(ptr %t1, i64 10, ptr align 16 %tab)53 store ptr %t1, ptr %p54 ret void55}56 57define ptr @minimal_invariant_start_use(i8 %x) {58; CHECK-LABEL: @minimal_invariant_start_use(59; CHECK-NEXT: ret ptr poison60;61 %a = alloca i862 %i = call ptr @llvm.invariant.start.p0(i64 1, ptr %a)63 ret ptr %i64}65 66declare void @llvm.lifetime.start.p0(ptr nocapture) #167declare i64 @llvm.objectsize.i64.p0(ptr, i1) #268declare void @llvm.lifetime.end.p0(ptr nocapture) #169declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #070declare ptr @llvm.invariant.start.p0(i64 immarg, ptr nocapture) #071declare void @llvm.invariant.end.p0(ptr, i64 immarg, ptr nocapture) #072