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
143 lines
3.6 KiB
LLVM
143 lines
3.6 KiB
LLVM
; RUN: opt < %s -passes='print<phi-values>' -disable-output 2>&1 | FileCheck %s
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; This test uses a long chain of phis that take themselves as an operand, which causes
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; phi values analysis to segfault if it's not careful about that kind of thing.
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; CHECK-LABEL: PHI Values for function: fn
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define void @fn(ptr %arg, i1 %arg1) {
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entry:
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br label %while1.cond
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while1.cond:
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; CHECK: PHI %phi1 has values:
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; CHECK: ptr %arg
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%phi1 = phi ptr [ %arg, %entry ], [ %phi2, %while1.then ]
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br i1 %arg1, label %while1.end, label %while1.body
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while1.body:
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br i1 %arg1, label %while1.then, label %while1.if
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while1.if:
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br label %while1.then
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while1.then:
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; CHECK: PHI %phi2 has values:
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; CHECK: ptr %arg
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%phi2 = phi ptr [ %arg, %while1.if ], [ %phi1, %while1.body ]
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br label %while1.cond
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while1.end:
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br label %while2.cond1
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while2.cond1:
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; CHECK: PHI %phi3 has values:
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; CHECK: ptr %arg
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%phi3 = phi ptr [ %phi1, %while1.end ], [ %phi5, %while2.then ]
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br i1 %arg1, label %while2.end, label %while2.body1
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while2.body1:
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br i1 %arg1, label %while2.cond2, label %while2.then
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while2.cond2:
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; CHECK: PHI %phi4 has values:
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; CHECK: ptr %arg
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%phi4 = phi ptr [ %phi3, %while2.body1 ], [ %phi4, %while2.if ]
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br i1 %arg1, label %while2.then, label %while2.if
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while2.if:
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br label %while2.cond2
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while2.then:
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; CHECK: PHI %phi5 has values:
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; CHECK: ptr %arg
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%phi5 = phi ptr [ %phi3, %while2.body1 ], [ %phi4, %while2.cond2 ]
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br label %while2.cond1
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while2.end:
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br label %while3.cond1
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while3.cond1:
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; CHECK: PHI %phi6 has values:
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; CHECK: ptr %arg
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%phi6 = phi ptr [ %phi3, %while2.end ], [ %phi7, %while3.cond2 ]
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br i1 %arg1, label %while3.end, label %while3.cond2
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while3.cond2:
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; CHECK: PHI %phi7 has values:
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; CHECK: ptr %arg
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%phi7 = phi ptr [ %phi6, %while3.cond1 ], [ %phi7, %while3.body ]
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br i1 %arg1, label %while3.cond1, label %while3.body
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while3.body:
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br label %while3.cond2
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while3.end:
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br label %while4.cond1
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while4.cond1:
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; CHECK: PHI %phi8 has values:
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; CHECK: ptr %arg
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%phi8 = phi ptr [ %phi6, %while3.end ], [ %phi10, %while4.then ]
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br i1 %arg1, label %while4.end, label %while4.if
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while4.if:
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br i1 %arg1, label %while4.cond2, label %while4.then
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while4.cond2:
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; CHECK: PHI %phi9 has values:
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; CHECK: ptr %arg
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%phi9 = phi ptr [ %phi8, %while4.if ], [ %phi9, %while4.body ]
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br i1 %arg1, label %while4.then, label %while4.body
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while4.body:
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br label %while4.cond2
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while4.then:
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; CHECK: PHI %phi10 has values:
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; CHECK: ptr %arg
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%phi10 = phi ptr [ %phi8, %while4.if ], [ %phi9, %while4.cond2 ]
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br label %while4.cond1
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while4.end:
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br label %while5.cond
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while5.cond:
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; CHECK: PHI %phi11 has values:
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; CHECK: ptr %arg
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%phi11 = phi ptr [ %phi8, %while4.end ], [ %phi13, %while5.then ]
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br i1 %arg1, label %while5.end, label %while5.body1
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while5.body1:
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br i1 %arg1, label %while5.if, label %while5.then
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while5.if:
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; CHECK: PHI %phi12 has values:
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; CHECK: ptr %arg
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%phi12 = phi ptr [ %phi11, %while5.body1 ], [ %phi12, %while5.body2 ]
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br i1 %arg1, label %while5.then, label %while5.body2
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while5.body2:
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br label %while5.if
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while5.then:
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; CHECK: PHI %phi13 has values:
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; CHECK: ptr %arg
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%phi13 = phi ptr [ %phi11, %while5.body1 ], [ %phi12, %while5.if ]
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br label %while5.cond
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while5.end:
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br label %while6.cond1
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while6.cond1:
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; CHECK: PHI %phi14 has values:
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; CHECK: ptr %arg
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%phi14 = phi ptr [ %phi11, %while5.end ], [ %phi14, %while6.cond1 ]
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br i1 %arg1, label %while6.cond2, label %while6.cond1
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while6.cond2:
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; CHECK: PHI %phi15 has values:
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; CHECK: ptr %arg
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%phi15 = phi ptr [ %phi14, %while6.cond1 ], [ %phi15, %while6.cond2 ]
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br label %while6.cond2
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}
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