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ff44ba6c52
`IVVisitor::visitCast` used to have the invariant that if the instruction it was passed was a sext or zext instruction, the result of the instruction would be wider than the induction variable. This is no longer true after rL275037, so this change teaches `IndVarSimplify` s implementation of `IVVisitor::visitCast` to work with the relaxed invariant. A corresponding change to SimplifyIndVar to preserve the said invariant after rL275037 would also work, but given how `IVVisitor::visitCast` is spelled (no indication of said invariant), I figured the current fix is cleaner. Fixes PR28935. llvm-svn: 278584
21 lines
489 B
LLVM
21 lines
489 B
LLVM
; RUN: opt -S -indvars < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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declare i16 @fn1(i16 returned, i64)
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define void @fn2() {
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; CHECK-LABEL: @fn2(
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entry:
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br label %for.cond
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for.cond:
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%f.0 = phi i64 [ undef, %entry ], [ %inc, %for.cond ]
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%conv = trunc i64 %f.0 to i16
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%call = tail call i16 @fn1(i16 %conv, i64 %f.0)
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%conv2 = zext i16 %call to i32
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%inc = add nsw i64 %f.0, 1
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br label %for.cond
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}
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