[PATCH] D83818: [AArch64] fjcvtzs,rmif,cfinv,setf* all clobber nzcv

[Jon Roelofs via Phabricator via llvm-commits]

jroelofs created this revision.
jroelofs added reviewers: t.p.northover, aemerson.
Herald added subscribers: llvm-commits, danielkiss, hiraditya, kristof.beyls.
Herald added a project: LLVM.

Adding these defs will prevent these instructions from being scheduled within an nzcv live range.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D83818

Files:
  llvm/lib/Target/AArch64/AArch64InstrFormats.td
  llvm/lib/Target/AArch64/AArch64InstrInfo.td


Index: llvm/lib/Target/AArch64/AArch64InstrInfo.td
===================================================================
--- llvm/lib/Target/AArch64/AArch64InstrInfo.td
+++ llvm/lib/Target/AArch64/AArch64InstrInfo.td
@@ -1025,7 +1025,7 @@
 }
 
 // v8.3a floating point conversion for javascript
-let Predicates = [HasJS, HasFPARMv8] in
+let Predicates = [HasJS, HasFPARMv8], Defs = [NZCV] in
 def FJCVTZS  : BaseFPToIntegerUnscaled<0b01, 0b11, 0b110, FPR64, GPR32,
                                       "fjcvtzs",
                                       [(set GPR32:$Rd,
@@ -1034,7 +1034,7 @@
 } // HasJS, HasFPARMv8
 
 // v8.4 Flag manipulation instructions
-let Predicates = [HasFMI] in {
+let Predicates = [HasFMI], Defs = [NZCV], Uses = [NZCV] in {
 def CFINV : SimpleSystemI<0, (ins), "cfinv", "">, Sched<[WriteSys]> {
   let Inst{20-5} = 0b0000001000000000;
 }
Index: llvm/lib/Target/AArch64/AArch64InstrFormats.td
===================================================================
--- llvm/lib/Target/AArch64/AArch64InstrFormats.td
+++ llvm/lib/Target/AArch64/AArch64InstrFormats.td
@@ -1939,6 +1939,7 @@
     : I<(outs), iops, asm, ops, "", []>,
       Sched<[WriteI, ReadI, ReadI]> {
   let Uses = [NZCV];
+  let Defs = [NZCV];
   bits<5> Rn;
   let Inst{31}    = sf;
   let Inst{30-15} = 0b0111010000000000;


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