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Author SHA1 Message Date
Matthias Braun f29b12dca8 ScheduleDAGInstrs: Ignore dependencies of constant physregs 
There is no need to track dependencies for constant physregs, as they
don't change their value no matter in what order you read/write to them.

Differential Revision: https://reviews.llvm.org/D26221

llvm-svn: 286526
 2016-11-10 23:46:44 +00:00
Evgeny Astigeevich fd89fe0dd3 [AArch64][CodeGen] Fix of PR27158: incorrect peephole optimization in AArch64InstrInfo::optimizeCompareInstr 
AArch64InstrInfo::optimizeCompareInstr has bug PR27158 which causes generation of incorrect code.
A compare instruction is substituted with another instruction which does not
produce the same flags as the original compare instruction.
This patch contains:
1. Fix of the bug.
2. A regression test in MIR.
3. A new test to check that SUBS is replaced by SUB.

Differential Revision: http://reviews.llvm.org/D18838

llvm-svn: 266969
 2016-04-21 08:54:08 +00:00