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https://github.com/c64scene-ar/llvm-6502.git
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77e22b7836
PHI nodes can have zero operands in the middle of a transform. It is expected that utilities in Analysis don't freak out when this happens. Note that it is considered invalid to allow these misshapen phi nodes to make it to another pass. This fixes PR22086. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225126 91177308-0d34-0410-b5e6-96231b3b80d8
29 lines
640 B
LLVM
29 lines
640 B
LLVM
; RUN: opt -S -jump-threading < %s | FileCheck %s
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; CHECK-LABEL: @f(
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; CHECK-LABEL: entry:
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; CHECK-NEXT: br label %[[loop:.*]]
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; CHECK: [[loop]]:
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; CHECK-NEXT: br label %[[loop]]
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define void @f() {
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entry:
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br label %for.cond1
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if.end16:
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%phi1 = phi i32 [ undef, %for.cond1 ]
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%g.3 = phi i32 [ %g.1, %for.cond1 ]
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%sext = shl i32 %g.3, 16
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%conv20 = ashr exact i32 %sext, 16
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%tobool21 = icmp eq i32 %phi1, 0
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br i1 %tobool21, label %lor.rhs, label %for.cond1
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for.cond1:
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%g.1 = phi i32 [ 0, %entry ], [ 0, %lor.rhs ], [ %g.3, %if.end16 ]
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br i1 undef, label %lor.rhs, label %if.end16
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lor.rhs:
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br label %for.cond1
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}
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