mirror of
https://git.proxmox.com/git/llvm-toolchain
synced 2025-06-14 21:10:25 +00:00
54 lines
2.3 KiB
Diff
54 lines
2.3 KiB
Diff
From f94d12b6108b944199b715f31f25a022f75d2feb Mon Sep 17 00:00:00 2001
|
|
From: Yichao Yu <yyc1992@gmail.com>
|
|
Date: Sat, 10 Jun 2017 08:45:13 -0400
|
|
Subject: [PATCH 4/4] Enable support for floating-point division reductions
|
|
|
|
Similar to fsub, fdiv can also be vectorized using fmul.
|
|
---
|
|
lib/Transforms/Utils/LoopUtils.cpp | 1 +
|
|
test/Transforms/LoopVectorize/float-reduction.ll | 22 ++++++++++++++++++++++
|
|
2 files changed, 23 insertions(+)
|
|
|
|
Index: llvm-toolchain-6.0-6.0.1/lib/Transforms/Utils/LoopUtils.cpp
|
|
===================================================================
|
|
--- llvm-toolchain-6.0-6.0.1.orig/lib/Transforms/Utils/LoopUtils.cpp
|
|
+++ llvm-toolchain-6.0-6.0.1/lib/Transforms/Utils/LoopUtils.cpp
|
|
@@ -513,6 +513,7 @@ RecurrenceDescriptor::isRecurrenceInstr(
|
|
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:
|
|
Index: llvm-toolchain-6.0-6.0.1/test/Transforms/LoopVectorize/float-reduction.ll
|
|
===================================================================
|
|
--- llvm-toolchain-6.0-6.0.1.orig/test/Transforms/LoopVectorize/float-reduction.ll
|
|
+++ llvm-toolchain-6.0-6.0.1/test/Transforms/LoopVectorize/float-reduction.ll
|
|
@@ -44,3 +44,25 @@ for.body:
|
|
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
|
|
+}
|