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b1a0559fbb
The loop on IVOperand's incoming values assumes IVOperand to be an induction variable on the loop over which `S Pred X` is invariant; otherwise loop invariant incoming values to IVOperand are not guaranteed to dominate the comparision. This fixes PR26973. llvm-svn: 263827
34 lines
1.0 KiB
LLVM
34 lines
1.0 KiB
LLVM
; RUN: opt -S -indvars < %s | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.11.0"
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@a = common global double* null, align 8
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@b = common global double 0.000000e+00, align 8
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define void @fn1(i32 %p1) {
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; CHECK-LABEL: @fn1(
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entry:
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%ld = load double*, double** @a, align 8
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br label %outer.loop
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outer.loop:
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%iv.outer = phi i32 [ %p1, %entry ], [ %iv.outer.dec, %outer.be ]
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%idxprom = sext i32 %iv.outer to i64
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%arrayidx = getelementptr inbounds double, double* %ld, i64 %idxprom
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%arrayidx.bc = bitcast double* %arrayidx to i64*
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br label %inner.loop
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inner.loop:
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%iv.inner = phi i32 [ %iv.outer, %outer.loop ], [ %iv.inner.dec, %inner.loop ]
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%ld.arr = load i64, i64* %arrayidx.bc, align 8
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store i64 %ld.arr, i64* bitcast (double* @b to i64*), align 8
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%iv.inner.dec = add nsw i32 %iv.inner, -1
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%cmp = icmp slt i32 %iv.outer, %iv.inner.dec
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br i1 %cmp, label %outer.be, label %inner.loop
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outer.be:
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%iv.outer.dec = add nsw i32 %iv.outer, -1
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br label %outer.loop
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}
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