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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
60 lines
2.4 KiB
LLVM
60 lines
2.4 KiB
LLVM
; RUN: llvm-reduce %s -o %t --abort-on-invalid-reduction --delta-passes=operands-skip --test FileCheck --test-arg %s --test-arg --match-full-lines --test-arg --check-prefix=INTERESTING --test-arg --input-file
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; RUN: FileCheck %s --input-file %t --check-prefixes=REDUCED
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; INTERESTING: store i32 43, ptr {{(%imm|%indirect)}}, align 4
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; REDUCED: store i32 43, ptr %imm, align 4
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; INTERESTING: store i32 44, ptr {{(%imm|%indirect|%phi)}}, align 4
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; REDUCED: store i32 44, ptr %phi, align 4
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; INTERESTING: store i32 45, ptr {{(%imm|%indirect|%phi|%val)}}, align 4
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; REDUCED: store i32 45, ptr %val, align 4
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; INTERESTING: store i32 46, ptr {{(%imm|%indirect|%phi|%val|@Global)}}, align 4
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; REDUCED: store i32 46, ptr @Global, align 4
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; INTERESTING: store i32 47, ptr {{(%imm|%indirect|%phi|%val|@Global|%arg2)}}, align 4
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; REDUCED: store i32 47, ptr %arg2, align 4
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; INTERESTING: store i32 48, ptr {{(%imm|%indirect|%phi|%val|@Global|%arg2|%arg1)}}, align 4
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; REDUCED: store i32 48, ptr %arg1, align 4
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; INTERESTING: store i32 49, ptr {{(%imm|%indirect|%phi|%val|@Global|%arg2|%arg1|null)}}, align 4
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; REDUCED: store i32 49, ptr null, align 4
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; REDUCED: store i32 50, ptr %arg1, align 4
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; REDUCED: store i32 51, ptr %arg1, align 4
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@Global = global i32 42
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define void @func(ptr %arg1, ptr %arg2, i1 %arg) {
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entry:
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%val = getelementptr i32, ptr getelementptr (i32, ptr @Global, i32 1), i32 2
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br i1 %arg, label %branch, label %loop
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branch:
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%nondominating1 = getelementptr i32, ptr %val, i32 3
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br label %loop
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loop:
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%phi = phi ptr [ null, %entry ], [ %nondominating1, %branch ], [ %nondominating2, %loop ]
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%imm = getelementptr i32, ptr %phi, i32 4
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%indirect = getelementptr i32, ptr %imm, i32 5
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store i32 43, ptr %imm, align 4 ; Don't reduce to %indirect (not "more reduced" than %imm)
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store i32 44, ptr %imm, align 4 ; Reduce to %phi
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store i32 45, ptr %imm, align 4 ; Reduce to %val
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store i32 46, ptr %imm, align 4 ; Reduce to @Global
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store i32 47, ptr %imm, align 4 ; Reduce to %arg1
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store i32 48, ptr %imm, align 4 ; Reduce to %arg2
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store i32 49, ptr %imm, align 4 ; Reduce to null
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%nondominating2 = getelementptr i32, ptr %indirect, i32 6
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br i1 %arg, label %loop, label %exit
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exit:
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store i32 50, ptr %arg2, align 4 ; Reduce to %arg1 (compactify function arguments)
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store i32 51, ptr %arg1, align 4 ; Don't reduce
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ret void
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}
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