address comments

Author: AlexMaclean

llvm/lib/Target/NVPTX/NVPTXInstrInfo.td

@@ -731,14 +731,14 @@ def fpround_oneuse : PatFrag<(ops node:$a), (fpround node:$a), [{
   return N->hasOneUse();
 }]>;
 
-def : Pat<(v2bf16 (build_vector (bf16 (fpround_oneuse Float32Regs:$a)),
-                                (bf16 (fpround_oneuse Float32Regs:$b)))),
-          (CVT_bf16x2_f32 Float32Regs:$b, Float32Regs:$a, CvtRN)>,
+def : Pat<(v2bf16 (build_vector (bf16 (fpround_oneuse Float32Regs:$lo)),
+                                (bf16 (fpround_oneuse Float32Regs:$hi)))),
+          (CVT_bf16x2_f32 Float32Regs:$hi, Float32Regs:$lo, CvtRN)>,
       Requires<[hasPTX<70>, hasSM<80>, hasBF16Math]>;
 
-def : Pat<(v2f16 (build_vector (f16 (fpround_oneuse Float32Regs:$a)),
-                               (f16 (fpround_oneuse Float32Regs:$b)))),
-          (CVT_f16x2_f32 Float32Regs:$b, Float32Regs:$a, CvtRN)>,
+def : Pat<(v2f16 (build_vector (f16 (fpround_oneuse Float32Regs:$lo)),
+                               (f16 (fpround_oneuse Float32Regs:$hi)))),
+          (CVT_f16x2_f32 Float32Regs:$hi, Float32Regs:$lo, CvtRN)>,
       Requires<[hasPTX<70>, hasSM<80>, useFP16Math]>;
 
 //-----------------------------------