1469d82e1c
As defined in LangRef, branching on `undef` is undefined behavior. This PR aims to remove undefined behavior from tests. As UB tests break Alive2 and may be the root cause of breaking future optimizations. Here's an Alive2 proof for one of the examples: https://alive2.llvm.org/ce/z/TncxhP
150 lines
5.4 KiB
LLVM
150 lines
5.4 KiB
LLVM
; RUN: opt -aa-pipeline=basic-aa -passes='print<memoryssa>,verify<memoryssa>' -disable-output < %s 2>&1 | FileCheck %s
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%struct.hoge = type { i32, %struct.widget }
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%struct.widget = type { i64 }
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define hidden void @quux(ptr %f, i1 %arg) align 2 {
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%tmp = getelementptr inbounds %struct.hoge, ptr %f, i64 0, i32 1, i32 0
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%tmp24 = getelementptr inbounds %struct.hoge, ptr %f, i64 0, i32 1
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br label %bb26
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bb26: ; preds = %bb77, %0
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; CHECK: 3 = MemoryPhi({%0,liveOnEntry},{bb77,2})
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; CHECK-NEXT: br i1 %arg, label %bb68, label %bb77
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br i1 %arg, label %bb68, label %bb77
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bb68: ; preds = %bb26
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; CHECK: MemoryUse(liveOnEntry)
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; CHECK-NEXT: %tmp69 = load i64, ptr null, align 8
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%tmp69 = load i64, ptr null, align 8
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; CHECK: 1 = MemoryDef(3)
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; CHECK-NEXT: store i64 %tmp69, ptr %tmp, align 8
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store i64 %tmp69, ptr %tmp, align 8
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br label %bb77
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bb77: ; preds = %bb68, %bb26
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; CHECK: 2 = MemoryPhi({bb26,3},{bb68,1})
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; CHECK: MemoryUse(2)
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; CHECK-NEXT: %tmp78 = load ptr, ptr %tmp24, align 8
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%tmp78 = load ptr, ptr %tmp24, align 8
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%tmp79 = getelementptr inbounds i64, ptr %tmp78, i64 undef
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br label %bb26
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}
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define hidden void @quux_no_null_opt(ptr %f, i1 %arg) align 2 #0 {
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; CHECK-LABEL: quux_no_null_opt(
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%tmp = getelementptr inbounds %struct.hoge, ptr %f, i64 0, i32 1, i32 0
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%tmp24 = getelementptr inbounds %struct.hoge, ptr %f, i64 0, i32 1
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br label %bb26
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bb26: ; preds = %bb77, %0
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; CHECK: 3 = MemoryPhi({%0,liveOnEntry},{bb77,2})
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; CHECK-NEXT: br i1 %arg, label %bb68, label %bb77
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br i1 %arg, label %bb68, label %bb77
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bb68: ; preds = %bb26
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; CHECK: MemoryUse(3)
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; CHECK-NEXT: %tmp69 = load i64, ptr null, align 8
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%tmp69 = load i64, ptr null, align 8
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; CHECK: 1 = MemoryDef(3)
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; CHECK-NEXT: store i64 %tmp69, ptr %tmp, align 8
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store i64 %tmp69, ptr %tmp, align 8
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br label %bb77
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bb77: ; preds = %bb68, %bb26
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; CHECK: 2 = MemoryPhi({bb26,3},{bb68,1})
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; CHECK: MemoryUse(2)
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; CHECK-NEXT: %tmp78 = load ptr, ptr %tmp24, align 8
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%tmp78 = load ptr, ptr %tmp24, align 8
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%tmp79 = getelementptr inbounds i64, ptr %tmp78, i64 undef
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br label %bb26
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}
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; CHECK-LABEL: define void @quux_skip
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define void @quux_skip(ptr noalias %f, ptr noalias %g, i1 %arg) align 2 {
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%tmp = getelementptr inbounds %struct.hoge, ptr %f, i64 0, i32 1, i32 0
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%tmp24 = getelementptr inbounds %struct.hoge, ptr %f, i64 0, i32 1
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br label %bb26
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bb26: ; preds = %bb77, %0
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; CHECK: 3 = MemoryPhi({%0,liveOnEntry},{bb77,2})
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; CHECK-NEXT: br i1 %arg, label %bb68, label %bb77
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br i1 %arg, label %bb68, label %bb77
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bb68: ; preds = %bb26
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; CHECK: MemoryUse(3)
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; CHECK-NEXT: %tmp69 = load i64, ptr %g, align 8
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%tmp69 = load i64, ptr %g, align 8
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; CHECK: 1 = MemoryDef(3)
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; CHECK-NEXT: store i64 %tmp69, ptr %g, align 8
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store i64 %tmp69, ptr %g, align 8
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br label %bb77
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bb77: ; preds = %bb68, %bb26
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; CHECK: 2 = MemoryPhi({bb26,3},{bb68,1})
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; CHECK: MemoryUse(liveOnEntry)
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; CHECK-NEXT: %tmp78 = load ptr, ptr %tmp24, align 8
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%tmp78 = load ptr, ptr %tmp24, align 8
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br label %bb26
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}
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; CHECK-LABEL: define void @quux_dominated
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define void @quux_dominated(ptr noalias %f, ptr noalias %g, i1 %arg) align 2 {
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%tmp = getelementptr inbounds %struct.hoge, ptr %f, i64 0, i32 1, i32 0
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%tmp24 = getelementptr inbounds %struct.hoge, ptr %f, i64 0, i32 1
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br label %bb26
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bb26: ; preds = %bb77, %0
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; CHECK: 3 = MemoryPhi({%0,liveOnEntry},{bb77,2})
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; CHECK: MemoryUse(3)
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; CHECK-NEXT: load ptr, ptr %tmp24, align 8
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load ptr, ptr %tmp24, align 8
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br i1 %arg, label %bb68, label %bb77
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bb68: ; preds = %bb26
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; CHECK: MemoryUse(3)
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; CHECK-NEXT: %tmp69 = load i64, ptr %g, align 8
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%tmp69 = load i64, ptr %g, align 8
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; CHECK: 1 = MemoryDef(3)
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; CHECK-NEXT: store i64 %tmp69, ptr %g, align 8
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store i64 %tmp69, ptr %g, align 8
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br label %bb77
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bb77: ; preds = %bb68, %bb26
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; CHECK: 4 = MemoryPhi({bb26,3},{bb68,1})
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; CHECK: 2 = MemoryDef(4)
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; CHECK-NEXT: store ptr null, ptr %tmp24, align 8
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store ptr null, ptr %tmp24, align 8
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br label %bb26
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}
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; CHECK-LABEL: define void @quux_nodominate
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define void @quux_nodominate(ptr noalias %f, ptr noalias %g, i1 %arg) align 2 {
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%tmp = getelementptr inbounds %struct.hoge, ptr %f, i64 0, i32 1, i32 0
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%tmp24 = getelementptr inbounds %struct.hoge, ptr %f, i64 0, i32 1
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br label %bb26
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bb26: ; preds = %bb77, %0
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; CHECK: 3 = MemoryPhi({%0,liveOnEntry},{bb77,2})
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; CHECK: MemoryUse(liveOnEntry)
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; CHECK-NEXT: load ptr, ptr %tmp24, align 8
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load ptr, ptr %tmp24, align 8
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br i1 %arg, label %bb68, label %bb77
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bb68: ; preds = %bb26
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; CHECK: MemoryUse(3)
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; CHECK-NEXT: %tmp69 = load i64, ptr %g, align 8
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%tmp69 = load i64, ptr %g, align 8
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; CHECK: 1 = MemoryDef(3)
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; CHECK-NEXT: store i64 %tmp69, ptr %g, align 8
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store i64 %tmp69, ptr %g, align 8
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br label %bb77
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bb77: ; preds = %bb68, %bb26
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; CHECK: 2 = MemoryPhi({bb26,3},{bb68,1})
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; CHECK-NEXT: br label %bb26
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br label %bb26
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}
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attributes #0 = { null_pointer_is_valid }
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