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[SLPVectorizer] Try different vectorization factors for store chains

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...and set max vector register size based on target 

This patch is based on discussion on the llvmdev mailing list:
http://lists.cs.uiuc.edu/pipermail/llvmdev/2015-July/087405.html

and also solves:
https://llvm.org/bugs/show_bug.cgi?id=17170

Several FIXME/TODO items are noted in comments as potential improvements.

Differential Revision: http://reviews.llvm.org/D10950



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241760 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjay Patel
2015-07-08 23:40:55 +00:00
parent 6e999b0a30
commit c1c43c15cc
6 changed files with 76 additions and 31 deletions
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29
test/Transforms/SLPVectorizer/X86/cse.ll
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@@ -12,11 +12,8 @@ target triple = "i386-apple-macosx10.8.0"
;CHECK-LABEL: @test(
;CHECK: load <2 x double>
;CHECK: fadd <2 x double>
;CHECK: store <2 x double>
;CHECK: insertelement <2 x double>
;CHECK: fadd <2 x double>
;CHECK: store <2 x double>
;CHECK: fadd <4 x double>
;CHECK: store <4 x double>
;CHECK: ret i32
define i32 @test(double* nocapture %G) {
@@ -48,11 +45,12 @@ entry:
; A[2] = A[2] * 7.6 * n + 3.0;
; A[3] = A[3] * 7.4 * n + 4.0;
;}
;CHECK-LABEL: @foo(
;CHECK: insertelement <2 x double>
;CHECK: insertelement <2 x double>
;CHECK-NOT: insertelement <2 x double>
;CHECK: ret
; CHECK-LABEL: @foo(
; CHECK: load <4 x double>
; CHECK: fmul <4 x double>
; CHECK: fmul <4 x double>
; CHECK: fadd <4 x double>
; CHECK: store <4 x double>
define i32 @foo(double* nocapture %A, i32 %n) {
entry:
%0 = load double, double* %A, align 8
@@ -140,11 +138,12 @@ define i32 @test2(double* nocapture %G, i32 %k) {
; A[2] = A[2] * 7.9 * n + 6.0;
; A[3] = A[3] * 7.9 * n + 6.0;
;}
;CHECK-LABEL: @foo4(
;CHECK: insertelement <2 x double>
;CHECK: insertelement <2 x double>
;CHECK-NOT: insertelement <2 x double>
;CHECK: ret
; CHECK-LABEL: @foo4(
; CHECK: load <4 x double>
; CHECK: fmul <4 x double>
; CHECK: fmul <4 x double>
; CHECK: fadd <4 x double>
; CHECK: store <4 x double>
define i32 @foo4(double* nocapture %A, i32 %n) {
entry:
%0 = load double, double* %A, align 8