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
51 lines
1.6 KiB
LLVM
51 lines
1.6 KiB
LLVM
; RUN: opt -passes=gvn-hoist -S < %s | FileCheck %s
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; REQUIRES: asserts
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%struct.job_pool.6.7 = type { i32 }
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; CHECK-LABEL: @f(i1 %arg)
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define dso_local void @f(i1 %arg) {
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entry:
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br label %for.cond
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for.cond: ; preds = %for.end, %entry
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br label %for.body
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for.body: ; preds = %for.cond
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br label %if.end
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if.then: ; No predecessors!
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br label %if.end
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if.end: ; preds = %if.then, %for.body
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br i1 false, label %for.body12.lr.ph, label %for.end
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for.body12.lr.ph: ; preds = %if.end
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br label %for.body12
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for.body12: ; preds = %if.end40, %for.body12.lr.ph
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br label %if.then23
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if.then23: ; preds = %for.body12
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br i1 %arg, label %if.then24, label %if.else
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if.then24: ; preds = %if.then23
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%0 = load ptr, ptr undef, align 8
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br label %if.end40
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if.else: ; preds = %if.then23
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%1 = load ptr, ptr undef, align 8
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br label %if.end40
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if.end40: ; preds = %if.else, %if.then24
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br i1 false, label %for.body12, label %for.cond9.for.end_crit_edge
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for.cond9.for.end_crit_edge: ; preds = %if.end40
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br label %for.end
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for.end: ; preds = %for.cond9.for.end_crit_edge, %if.end
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br i1 true, label %if.then45, label %for.cond
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if.then45: ; preds = %for.end
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ret void
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}
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