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[mips] Account for constant-zero operands in ADDE nodes.
authorVasileios Kalintiris <Vasileios.Kalintiris@imgtec.com>
Fri, 27 Feb 2015 09:01:39 +0000 (09:01 +0000)
committerVasileios Kalintiris <Vasileios.Kalintiris@imgtec.com>
Fri, 27 Feb 2015 09:01:39 +0000 (09:01 +0000)
commit912e816cc2eea0c9773530f16dcd4ec8b885e32f
treeaf9bce504815dc09b277bf76c358cfc94c132379tree | snapshot
parentf891336a25215a6d0720689ccce8bc31dbe3e9accommit | diff
[mips] Account for constant-zero operands in ADDE nodes.

Summary:
We identify the cases where the operand to an ADDE node is a constant
zero. In such cases, we can avoid generating an extra ADDu instruction
disguised as an identity move alias (ie. addu $r, $r, 0 --> move $r, $r).

Reviewers: dsanders

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D7906

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230742 91177308-0d34-0410-b5e6-96231b3b80d8
lib/Target/Mips/MipsSEISelDAGToDAG.cpp diff | blob | history
test/CodeGen/Mips/check-adde-redundant-moves.ll [new file with mode: 0644] blob
C/C++ LLVM-based compilers that forbids OOTA behaviors