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[X86] Add the mem-reg form of CMP to the macro fusion shouldScheduleAdjacent. 

Unlike the other arithmetic instructions the mem-reg form of compare is just a load and not a RMW operation. According to the Intel optimization manual, this form is also supported by macro fusion.

llvm-svn: 339498
This commit is contained in:
Craig Topper 2018-08-11 06:42:50 +00:00
parent 616eeb827d
commit c6cf169940
1 changed files with 4 additions and 0 deletions
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4
llvm/lib/Target/X86/X86MacroFusion.cpp
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@ -111,20 +111,24 @@ static bool shouldScheduleAdjacent(const TargetInstrInfo &TII,
case X86::CMP16ri8:
case X86::CMP16rm:
case X86::CMP16rr:
case X86::CMP16mr:
case X86::CMP32i32:
case X86::CMP32ri:
case X86::CMP32ri8:
case X86::CMP32rm:
case X86::CMP32rr:
case X86::CMP32mr:
case X86::CMP64i32:
case X86::CMP64ri32:
case X86::CMP64ri8:
case X86::CMP64rm:
case X86::CMP64rr:
case X86::CMP64mr:
case X86::CMP8i8:
case X86::CMP8ri:
case X86::CMP8rm:
case X86::CMP8rr:
case X86::CMP8mr:
case X86::ADD16i16:
case X86::ADD16ri:
case X86::ADD16ri8: