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[NVPTX] enable NaryReassociate in NVPTX

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Summary:
We run NaryReassociate right after SLSR because SLSR enables many
opportunities for NaryReassociate. For example, in nary-slsr.ll

  foo((a + b) + c);
  foo((a + b * 2) + c);
  foo((a + b * 3) + c);   // 2 muls and 6 adds

after SLSR:

  ab = a + b;
  foo(ab + c);
  ab2 = ab + b;
  foo(ab2 + c);
  ab3 = ab2 + b;
  foo(ab3 + c);           // 6 adds

after NaryReassociate:

  abc = (a + b) + c;
  foo(abc);
  ab2c = abc + b;
  foo(ab2c);
  ab3c = ab2c + b;
  foo(ab3c);              // 4 adds

Test Plan: nary-slsr.ll

Reviewers: jholewinski, eliben

Reviewed By: eliben

Subscribers: jholewinski, llvm-commits

Differential Revision: http://reviews.llvm.org/D9066

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235688 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jingyue Wu 2015-04-24 02:54:06 +00:00
parent 9dd5b1fbd8
commit d83b3b1a8d
3 changed files with 51 additions and 0 deletions
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2
lib/Target/NVPTX/NVPTXTargetMachine.cpp
View File

@ -179,6 +179,8 @@ void NVPTXPassConfig::addIRPasses() {
addPass(createGVNPass());
else
addPass(createEarlyCSEPass());
// Run NaryReassociate after EarlyCSE/GVN to be more effective.
addPass(createNaryReassociatePass());
}
bool NVPTXPassConfig::addInstSelector() {

2
test/Transforms/NaryReassociate/NVPTX/lit.local.cfg Normal file
View File

@ -0,0 +1,2 @@
if not 'NVPTX' in config.root.targets:
config.unsupported = True

47
test/Transforms/NaryReassociate/NVPTX/nary-slsr.ll Normal file
View File

@ -0,0 +1,47 @@
; RUN: opt < %s -slsr -nary-reassociate -S | FileCheck %s
; RUN: llc < %s -march=nvptx64 -mcpu=sm_20 | FileCheck %s --check-prefix=PTX
target datalayout = "e-i64:64-v16:16-v32:32-n16:32:64"
; foo((a + b) + c);
; foo((a + b * 2) + c);
; foo((a + b * 3) + c);
; =>
; abc = (a + b) + c;
; foo(abc);
; ab2c = abc + b;
; foo(ab2c);
; ab3c = ab2c + b;
; foo(ab3c);
define void @nary_reassociate_after_slsr(i32 %a, i32 %b, i32 %c) {
; CHECK-LABEL: @nary_reassociate_after_slsr(
; PTX-LABEL: .visible .func nary_reassociate_after_slsr(
; PTX: ld.param.u32 [[b:%r[0-9]+]], [nary_reassociate_after_slsr_param_1];
%ab = add i32 %a, %b
%abc = add i32 %ab, %c
call void @foo(i32 %abc)
; CHECK: call void @foo(i32 %abc)
; PTX: st.param.b32 [param0+0], [[abc:%r[0-9]+]];
%b2 = shl i32 %b, 1
%ab2 = add i32 %a, %b2
%ab2c = add i32 %ab2, %c
; CHECK-NEXT: %ab2c = add i32 %abc, %b
; PTX: add.s32 [[ab2c:%r[0-9]+]], [[abc]], [[b]]
call void @foo(i32 %ab2c)
; CHECK-NEXT: call void @foo(i32 %ab2c)
; PTX: st.param.b32 [param0+0], [[ab2c]];
%b3 = mul i32 %b, 3
%ab3 = add i32 %a, %b3
%ab3c = add i32 %ab3, %c
; CHECK-NEXT: %ab3c = add i32 %ab2c, %b
; PTX: add.s32 [[ab3c:%r[0-9]+]], [[ab2c]], [[b]]
call void @foo(i32 %ab3c)
; CHECK-NEXT: call void @foo(i32 %ab3c)
; PTX: st.param.b32 [param0+0], [[ab3c]];
ret void
}
declare void @foo(i32)