diff options
| author | Simon Dardis <simon.dardis@imgtec.com> | 2017-07-13 11:28:05 +0000 |
|---|---|---|
| committer | Simon Dardis <simon.dardis@imgtec.com> | 2017-07-13 11:28:05 +0000 |
| commit | 892ccd7f071ccad24610114cbe2e467310d7db71 (patch) | |
| tree | b7b4fb63ca44edd3e9d766d0f3fdb9d217efc724 /test/CodeGen/Mips/dsp-patterns.ll | |
| parent | d4a91bbb192c735de95a6e7701cd44e3270b8b00 (diff) | |
Reland "[mips] Fix multiprecision arithmetic."
For multiprecision arithmetic on MIPS, rather than using ISD::ADDE / ISD::ADDC,
get SelectionDAG to break down the operation into ISD::ADDs and ISD::SETCCs.
For MIPS, only the DSP ASE has a carry flag, so in the general case it is not
useful to directly support ISD::{ADDE, ADDC, SUBE, SUBC} nodes.
Also improve the generation code in such cases for targets with
TargetLoweringBase::ZeroOrOneBooleanContent by directly using the result of the
comparison node rather than using it in selects. Similarly for ISD::SUBE /
ISD::SUBC.
Address optimization breakage by moving the generation of MIPS specific integer
multiply-accumulate nodes to before legalization.
This revolves PR32713 and PR33424.
Thanks to Simonas Kazlauskas and Pirama Arumuga Nainar for reporting the issue!
Reviewers: slthakur
Differential Revision: https://reviews.llvm.org/D33494
The previous version of this patch was too aggressive in producing fused
integer multiple-addition instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307906 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/Mips/dsp-patterns.ll')
| -rw-r--r-- | test/CodeGen/Mips/dsp-patterns.ll | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/test/CodeGen/Mips/dsp-patterns.ll b/test/CodeGen/Mips/dsp-patterns.ll index 837c0d8bfc5..250d3eff37d 100644 --- a/test/CodeGen/Mips/dsp-patterns.ll +++ b/test/CodeGen/Mips/dsp-patterns.ll @@ -1,5 +1,5 @@ -; RUN: llc -march=mips -mattr=dsp < %s | FileCheck %s -check-prefix=R1 -; RUN: llc -march=mips -mattr=dspr2 < %s | FileCheck %s -check-prefix=R2 +; RUN: llc -march=mips -mcpu=mips32r2 -mattr=dsp < %s | FileCheck %s -check-prefix=R1 +; RUN: llc -march=mips -mcpu=mips32r2 -mattr=dspr2 < %s | FileCheck %s -check-prefix=R2 ; R1-LABEL: test_lbux: ; R1: lbux ${{[0-9]+}} |