1; RUN: opt -debug-pass=Executions -phi-values -memcpyopt -instcombine -disable-output < %s 2>&1 | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK-MEMCPY 2; RUN: opt -debug-pass=Executions -memdep -instcombine -disable-output < %s 2>&1 | FileCheck %s -check-prefix=CHECK 3 4; Check that phi values is not run when it's not already available, and that 5; basicaa is not freed after a pass that preserves CFG, as it preserves CFG. 6 7; CHECK: Executing Pass 'Phi Values Analysis' 8; CHECK: Executing Pass 'Basic Alias Analysis (stateless AA impl)' 9; CHECK: Executing Pass 'Memory Dependence Analysis' 10; CHECK-MEMCPY: Executing Pass 'MemCpy Optimization' 11; CHECK-MEMCPY-DAG: Freeing Pass 'MemCpy Optimization' 12; CHECK-DAG: Freeing Pass 'Phi Values Analysis' 13; CHECK-DAG: Freeing Pass 'Memory Dependence Analysis' 14; CHECK-MEMCPY-NOT: Freeing Pass 'Basic Alias Analysis (stateless AA impl)' 15; CHECK-NOT: Executing Pass 'Phi Values Analysis' 16; CHECK-NOT: Executing Pass 'Basic Alias Analysis (stateless AA impl)' 17; CHECK: Executing Pass 'Combine redundant instructions' 18 19target datalayout = "p:8:8-n8" 20 21declare void @otherfn([4 x i8]*) 22declare i32 @__gxx_personality_v0(...) 23declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) 24@c = external global i8*, align 1 25 26; This function is one where if we didn't free basicaa after memcpyopt then the 27; usage of basicaa in instcombine would cause a segfault due to stale phi-values 28; results being used. 29define void @fn(i8* %this, i64* %ptr) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) { 30entry: 31 %arr = alloca [4 x i8], align 8 32 %gep1 = getelementptr inbounds [4 x i8], [4 x i8]* %arr, i64 0, i32 0 33 br i1 undef, label %then, label %if 34 35if: 36 br label %then 37 38then: 39 %phi = phi i64* [ %ptr, %if ], [ null, %entry ] 40 store i8 1, i8* %gep1, align 8 41 %load = load i64, i64* %phi, align 8 42 %gep2 = getelementptr inbounds i8, i8* undef, i64 %load 43 %gep3 = getelementptr inbounds i8, i8* %gep2, i64 40 44 invoke i32 undef(i8* undef) 45 to label %invoke unwind label %lpad 46 47invoke: 48 unreachable 49 50lpad: 51 landingpad { i8*, i32 } 52 catch i8* null 53 call void @otherfn([4 x i8]* nonnull %arr) 54 unreachable 55} 56 57; When running instcombine after memdep, the basicaa used by instcombine uses 58; the phivalues that memdep used. This would then cause a segfault due to 59; instcombine deleting a phi whose values had been cached. 60define void @fn2() { 61entry: 62 %a = alloca i8, align 1 63 %0 = load i8*, i8** @c, align 1 64 %1 = bitcast i8* %0 to i8** 65 br label %for.cond 66 67for.cond: ; preds = %for.body, %entry 68 %d.0 = phi i8** [ %1, %entry ], [ null, %for.body ] 69 br i1 undef, label %for.body, label %for.cond.cleanup 70 71for.body: ; preds = %for.cond 72 store volatile i8 undef, i8* %a, align 1 73 br label %for.cond 74 75for.cond.cleanup: ; preds = %for.cond 76 call void @llvm.lifetime.end.p0i8(i64 1, i8* %a) 77 %2 = load i8*, i8** %d.0, align 1 78 store i8* %2, i8** @c, align 1 79 ret void 80} 81