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[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 :(.

llvm-svn: 212634
This commit is contained in:
Adam Nemet 2014-07-09 18:22:33 +00:00
parent 1ce0c37bf0
commit 2820a5b9e9
2 changed files with 40 additions and 1 deletions
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6
llvm/lib/Target/X86/X86TargetTransformInfo.cpp
View File

@ -144,13 +144,17 @@ unsigned X86TTI::getNumberOfRegisters(bool Vector) const {
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;

35
llvm/test/Transforms/LoopVectorize/X86/avx512.ll Normal file
View File

@ -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
}