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52782fda9f
We need to keep loop hints from the original loop on the new vector loop.
Failure to do this meant that, for example:
void foo(int *b) {
#pragma clang loop unroll(disable)
for (int i = 0; i < 16; ++i)
b[i] = 1;
}
this loop would be unrolled. Why? Because we'd vectorize it, thus dropping the
hints that unrolling should be disabled, and then we'd unroll it.
llvm-svn: 267970
31 lines
1.2 KiB
LLVM
31 lines
1.2 KiB
LLVM
; RUN: opt -S -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -instsimplify -simplifycfg < %s | FileCheck %s
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; Note: -instsimplify -simplifycfg remove the (now dead) original loop, making
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; it easy to test that the llvm.loop.unroll.disable hint is still present.
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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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; Function Attrs: norecurse nounwind uwtable
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define void @foo(i32* nocapture %b) #0 {
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entry:
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br label %for.body
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for.cond.cleanup: ; preds = %for.body
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ret void
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%arrayidx = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
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store i32 1, i32* %arrayidx, align 4
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv.next, 16
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br i1 %exitcond, label %for.cond.cleanup, label %for.body, !llvm.loop !0
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}
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; CHECK-LABEL: @foo
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; CHECK: = !{!"llvm.loop.unroll.disable"}
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attributes #0 = { norecurse nounwind uwtable }
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!0 = distinct !{!0, !1}
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!1 = !{!"llvm.loop.unroll.disable"}
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