================
@@ -2615,6 +2618,15 @@ bool SPIRVInstructionSelector::selectDiscard(Register
ResVReg,
.constrainAllUses(TII, TRI, RBI);
}
+bool SPIRVInstructionSelector::selectFwidth(Register ResVReg,
+ const SPIRVType *ResType,
+ MachineInstr &I) const {
+ return BuildMI(*I.getParent(), I, I.getDebugLoc(), TII.get(SPIRV::OpFwidth))
+ .addDef(ResVReg)
+ .addUse(GR.getSPIRVTypeID(ResType))
+ .addUse(I.getOperand(2).getReg());
+}
+
----------------
Alexander-Johnston wrote:
Renamed the selector for the DpdCoarse insts to `selectDerivativeInst` and sent
the fwidth to it as well, as they all have the same pattern and require
conversion to and from float when they are used with a half. This rule follows
for all the other derivative instructions so far as I can tell.
https://github.com/llvm/llvm-project/pull/161378
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