[PATCH] D68854: [X86] add mayRaiseFPException flag and FPCW registers for X87 instructions

[LiuChen via Phabricator via llvm-commits]

LiuChen3 added inline comments.


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Comment at: llvm/lib/Target/X86/X86InstrFPStack.td:708
 def FFREE : FPI<0xDD, MRM0r, (outs), (ins RSTi:$reg), "ffree\t$reg">;
 def FFREEP : FPI<0xDF, MRM0r, (outs), (ins RSTi:$reg), "ffreep\t$reg">;
 
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RKSimon wrote:
> Why did you change this? FFREE/FFREEP leave FPSW in an undefined state
Thanks for your review. I have added 'let Defs = [FPSW]' in class FPI.


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  https://reviews.llvm.org/D68854/new/

https://reviews.llvm.org/D68854