[llvm-branch-commits] [llvm] 4bc88a0 - Enable support for floating-point division reductions
Valentin Churavy via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Tue Nov 24 15:40:28 PST 2020
Author: Yichao Yu
Date: 2020-11-23T20:00:58-05:00
New Revision: 4bc88a0e9a2ee29959a9053e867ae6f051348554
URL: https://github.com/llvm/llvm-project/commit/4bc88a0e9a2ee29959a9053e867ae6f051348554
DIFF: https://github.com/llvm/llvm-project/commit/4bc88a0e9a2ee29959a9053e867ae6f051348554.diff
LOG: Enable support for floating-point division reductions
Similar to fsub, fdiv can also be vectorized using fmul.
Also http://llvm.org/viewvc/llvm-project?view=revision&revision=215200
Differential Revision: https://reviews.llvm.org/D34078
Co-authored-by: Jameson Nash <jameson at juliacomputing.com>
Added:
Modified:
llvm/lib/Analysis/IVDescriptors.cpp
llvm/test/Transforms/LoopVectorize/float-reduction.ll
Removed:
################################################################################
diff --git a/llvm/lib/Analysis/IVDescriptors.cpp b/llvm/lib/Analysis/IVDescriptors.cpp
index 86cbcb015f0f..a5cc622279c4 100644
--- a/llvm/lib/Analysis/IVDescriptors.cpp
+++ b/llvm/lib/Analysis/IVDescriptors.cpp
@@ -578,6 +578,7 @@ RecurrenceDescriptor::isRecurrenceInstr(Instruction *I, RecurrenceKind Kind,
return InstDesc(Kind == RK_IntegerOr, I);
case Instruction::Xor:
return InstDesc(Kind == RK_IntegerXor, I);
+ case Instruction::FDiv:
case Instruction::FMul:
return InstDesc(Kind == RK_FloatMult, I, UAI);
case Instruction::FSub:
diff --git a/llvm/test/Transforms/LoopVectorize/float-reduction.ll b/llvm/test/Transforms/LoopVectorize/float-reduction.ll
index f3b95d0ead7d..dec854845800 100644
--- a/llvm/test/Transforms/LoopVectorize/float-reduction.ll
+++ b/llvm/test/Transforms/LoopVectorize/float-reduction.ll
@@ -44,3 +44,47 @@ for.body: ; preds = %for.body, %entry
for.end: ; preds = %for.body
ret float %sub
}
+
+;CHECK-LABEL: @foodiv(
+;CHECK: fdiv fast <4 x float>
+;CHECK: ret
+define float @foodiv(float* nocapture %A, i32* nocapture %n) nounwind uwtable readonly ssp {
+entry:
+ br label %for.body
+
+for.body: ; preds = %for.body, %entry
+ %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
+ %sum.04 = phi float [ 1.000000e+00, %entry ], [ %sub, %for.body ]
+ %arrayidx = getelementptr inbounds float, float* %A, i64 %indvars.iv
+ %0 = load float, float* %arrayidx, align 4
+ %sub = fdiv fast float %sum.04, %0
+ %indvars.iv.next = add i64 %indvars.iv, 1
+ %lftr.wideiv = trunc i64 %indvars.iv.next to i32
+ %exitcond = icmp eq i32 %lftr.wideiv, 200
+ br i1 %exitcond, label %for.end, label %for.body
+
+for.end: ; preds = %for.body
+ ret float %sub
+}
+
+;CHECK-LABEL: @foonodiv(
+;CHECK-NOT: fdiv fast <4 x float>
+;CHECK: ret
+define float @foonodiv(float* nocapture %A, i32* nocapture %n) nounwind uwtable readonly ssp {
+entry:
+ br label %for.body
+
+for.body: ; preds = %for.body, %entry
+ %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
+ %sum.04 = phi float [ 1.000000e+00, %entry ], [ %sub, %for.body ]
+ %arrayidx = getelementptr inbounds float, float* %A, i64 %indvars.iv
+ %0 = load float, float* %arrayidx, align 4
+ %sub = fdiv fast float %0, %sum.04
+ %indvars.iv.next = add i64 %indvars.iv, 1
+ %lftr.wideiv = trunc i64 %indvars.iv.next to i32
+ %exitcond = icmp eq i32 %lftr.wideiv, 200
+ br i1 %exitcond, label %for.end, label %for.body
+
+for.end: ; preds = %for.body
+ ret float %sub
+}
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