[llvm] r212634 - [X86] AVX512: Enable it in the Loop Vectorizer
Adam Nemet
anemet at apple.com
Wed Jul 9 11:22:33 PDT 2014
Author: anemet
Date: Wed Jul 9 13:22:33 2014
New Revision: 212634
URL: http://llvm.org/viewvc/llvm-project?rev=212634&view=rev
Log:
[X86] AVX512: Enable it in the Loop Vectorizer
This lets us experiment with 512-bit vectorization without passing
force-vector-width manually.
The code generated for a simple integer memset loop is properly vectorized.
Disassembly is still broken for it though :(.
Added:
llvm/trunk/test/Transforms/LoopVectorize/X86/avx512.ll
Modified:
llvm/trunk/lib/Target/X86/X86TargetTransformInfo.cpp
Modified: llvm/trunk/lib/Target/X86/X86TargetTransformInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86TargetTransformInfo.cpp?rev=212634&r1=212633&r2=212634&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86TargetTransformInfo.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86TargetTransformInfo.cpp Wed Jul 9 13:22:33 2014
@@ -144,13 +144,17 @@ unsigned X86TTI::getNumberOfRegisters(bo
if (Vector && !ST->hasSSE1())
return 0;
- if (ST->is64Bit())
+ if (ST->is64Bit()) {
+ if (Vector && ST->hasAVX512())
+ return 32;
return 16;
+ }
return 8;
}
unsigned X86TTI::getRegisterBitWidth(bool Vector) const {
if (Vector) {
+ if (ST->hasAVX512()) return 512;
if (ST->hasAVX()) return 256;
if (ST->hasSSE1()) return 128;
return 0;
Added: llvm/trunk/test/Transforms/LoopVectorize/X86/avx512.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopVectorize/X86/avx512.ll?rev=212634&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/LoopVectorize/X86/avx512.ll (added)
+++ llvm/trunk/test/Transforms/LoopVectorize/X86/avx512.ll Wed Jul 9 13:22:33 2014
@@ -0,0 +1,35 @@
+; RUN: opt -mattr=+avx512f --loop-vectorize -S < %s | llc -mattr=+avx512f | FileCheck %s
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.9.0"
+
+; Verify that we generate 512-bit wide vectors for a basic integer memset
+; loop.
+
+; CHECK-LABEL: f:
+; CHECK: vmovdqu32 %zmm{{.}}, (
+; CHECK-NOT: %ymm
+
+define void @f(i32* %a, i32 %n) {
+entry:
+ %cmp4 = icmp sgt i32 %n, 0
+ br i1 %cmp4, label %for.body.preheader, label %for.end
+
+for.body.preheader: ; preds = %entry
+ br label %for.body
+
+for.body: ; preds = %for.body.preheader, %for.body
+ %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ]
+ %arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
+ store i32 %n, i32* %arrayidx, align 4
+ %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+ %lftr.wideiv = trunc i64 %indvars.iv.next to i32
+ %exitcond = icmp eq i32 %lftr.wideiv, %n
+ br i1 %exitcond, label %for.end.loopexit, label %for.body
+
+for.end.loopexit: ; preds = %for.body
+ br label %for.end
+
+for.end: ; preds = %for.end.loopexit, %entry
+ ret void
+}
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