[DAG] TargetLowering::isBinOp() - add ISD::SSUBSAT/USUBSAT

Add to the generic non-commutative binop list.

Author: RKSimon

llvm/include/llvm/CodeGen/TargetLowering.h

@@ -2458,6 +2458,8 @@ class TargetLoweringBase {
     case ISD::UDIV:
     case ISD::SREM:
     case ISD::UREM:
+    case ISD::SSUBSAT:
+    case ISD::USUBSAT:
     case ISD::FSUB:
     case ISD::FDIV:
     case ISD::FREM:

llvm/test/CodeGen/AMDGPU/ssubsat.ll

@@ -226,8 +226,8 @@ define <3 x i16> @v_ssubsat_v3i16(<3 x i16> %lhs, <3 x i16> %rhs) {
 ; GFX9-LABEL: v_ssubsat_v3i16:
 ; GFX9:       ; %bb.0:
 ; GFX9-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
-; GFX9-NEXT:    v_pk_sub_i16 v0, v0, v2 clamp
 ; GFX9-NEXT:    v_pk_sub_i16 v1, v1, v3 clamp
+; GFX9-NEXT:    v_pk_sub_i16 v0, v0, v2 clamp
 ; GFX9-NEXT:    s_setpc_b64 s[30:31]
   %result = call <3 x i16> @llvm.ssub.sat.v3i16(<3 x i16> %lhs, <3 x i16> %rhs)
   ret <3 x i16> %result

llvm/test/CodeGen/AMDGPU/usubsat.ll

@@ -147,8 +147,8 @@ define <3 x i16> @v_usubsat_v3i16(<3 x i16> %lhs, <3 x i16> %rhs) {
 ; GFX9-LABEL: v_usubsat_v3i16:
 ; GFX9:       ; %bb.0:
 ; GFX9-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
-; GFX9-NEXT:    v_pk_sub_u16 v0, v0, v2 clamp
 ; GFX9-NEXT:    v_pk_sub_u16 v1, v1, v3 clamp
+; GFX9-NEXT:    v_pk_sub_u16 v0, v0, v2 clamp
 ; GFX9-NEXT:    s_setpc_b64 s[30:31]
   %result = call <3 x i16> @llvm.usub.sat.v3i16(<3 x i16> %lhs, <3 x i16> %rhs)
   ret <3 x i16> %result