[AMDGPU] Global ISel for packed fp32 instructions (#65803)

Author: rampitec

llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp

@@ -872,6 +872,11 @@ AMDGPULegalizerInfo::AMDGPULegalizerInfo(const GCNSubtarget &ST_,
     FDIVActions.customFor({S16});
   }
 
+  if (ST.hasPackedFP32Ops()) {
+    FPOpActions.legalFor({V2S32});
+    FPOpActions.clampMaxNumElementsStrict(0, S32, 2);
+  }
+
   auto &MinNumMaxNum = getActionDefinitionsBuilder({
       G_FMINNUM, G_FMAXNUM, G_FMINNUM_IEEE, G_FMAXNUM_IEEE});
 

llvm/lib/Target/AMDGPU/SIInstructions.td

@@ -2720,6 +2720,13 @@ def : GCNPat<
   (V_MUL_F32_e64 0, (i32 CONST.FP32_NEG_ONE), $src_mods, $src)
 >;
 
+let SubtargetPredicate = HasPackedFP32Ops in {
+def : GCNPat<
+  (fcanonicalize (v2f32 (VOP3PMods v2f32:$src, i32:$src_mods))),
+  (V_PK_MUL_F32 0, CONST.FP32_ONE, $src_mods, $src)
+>;
+}
+
 // TODO: Handle fneg like other types.
 def : GCNPat<
   (fcanonicalize (f64 (VOP3Mods f64:$src, i32:$src_mods))),