57 lines
2.3 KiB
Diff
57 lines
2.3 KiB
Diff
From f94d12b6108b944199b715f31f25a022f75d2feb Mon Sep 17 00:00:00 2001
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From: Yichao Yu <yyc1992@gmail.com>
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Date: Sat, 10 Jun 2017 08:45:13 -0400
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Subject: [PATCH 4/4] Enable support for floating-point division reductions
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Similar to fsub, fdiv can also be vectorized using fmul.
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---
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lib/Transforms/Utils/LoopUtils.cpp | 1 +
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test/Transforms/LoopVectorize/float-reduction.ll | 22 ++++++++++++++++++++++
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2 files changed, 23 insertions(+)
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diff --git a/lib/Transforms/Utils/LoopUtils.cpp b/lib/Transforms/Utils/LoopUtils.cpp
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index 3c522786641..a4aced53a95 100644
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--- a/lib/Transforms/Utils/LoopUtils.cpp
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+++ b/lib/Transforms/Utils/LoopUtils.cpp
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@@ -451,6 +451,7 @@ RecurrenceDescriptor::isRecurrenceInstr(Instruction *I, RecurrenceKind Kind,
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return InstDesc(Kind == RK_IntegerOr, I);
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case Instruction::Xor:
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return InstDesc(Kind == RK_IntegerXor, I);
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+ case Instruction::FDiv:
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case Instruction::FMul:
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return InstDesc(Kind == RK_FloatMult, I, UAI);
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case Instruction::FSub:
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diff --git a/test/Transforms/LoopVectorize/float-reduction.ll b/test/Transforms/LoopVectorize/float-reduction.ll
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index f3b95d0ead7..669c54d55a2 100644
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--- a/test/Transforms/LoopVectorize/float-reduction.ll
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+++ b/test/Transforms/LoopVectorize/float-reduction.ll
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@@ -44,3 +44,25 @@ for.body: ; preds = %for.body, %entry
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for.end: ; preds = %for.body
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ret float %sub
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}
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+
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+;CHECK-LABEL: @foodiv(
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+;CHECK: fdiv fast <4 x float>
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+;CHECK: ret
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+define float @foodiv(float* nocapture %A, i32* nocapture %n) nounwind uwtable readonly ssp {
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+entry:
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+ br label %for.body
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+
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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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+ %sum.04 = phi float [ 1.000000e+00, %entry ], [ %sub, %for.body ]
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+ %arrayidx = getelementptr inbounds float, float* %A, i64 %indvars.iv
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+ %0 = load float, float* %arrayidx, align 4
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+ %sub = fdiv fast float %sum.04, %0
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+ %indvars.iv.next = add i64 %indvars.iv, 1
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+ %lftr.wideiv = trunc i64 %indvars.iv.next to i32
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+ %exitcond = icmp eq i32 %lftr.wideiv, 200
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+ br i1 %exitcond, label %for.end, label %for.body
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+
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+for.end: ; preds = %for.body
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+ ret float %sub
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+}
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--
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2.14.1
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