[PATCH] D122489: [AMDGPU] Fix adding modifiers when creating v_cmpx instructions.

[Thomas Symalla via Phabricator via llvm-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG3bd15c03c6d8: [AMDGPU] Fix adding modifiers when creating v_cmpx instructions. (authored by tsymalla).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D122489/new/

https://reviews.llvm.org/D122489

Files:
  llvm/lib/Target/AMDGPU/SIOptimizeExecMasking.cpp
  llvm/test/CodeGen/AMDGPU/vcmp-saveexec-to-vcmpx.mir


Index: llvm/test/CodeGen/AMDGPU/vcmp-saveexec-to-vcmpx.mir
===================================================================
--- llvm/test/CodeGen/AMDGPU/vcmp-saveexec-to-vcmpx.mir
+++ llvm/test/CodeGen/AMDGPU/vcmp-saveexec-to-vcmpx.mir
@@ -1,5 +1,5 @@
-# RUN: llc -march=amdgcn -mcpu=gfx1010 -mattr=-wavefrontsize32,+wavefrontsize64 -run-pass=si-optimize-exec-masking -verify-machineinstrs %s -o - | FileCheck -check-prefix=GCN %s
-# RUN: llc -march=amdgcn -mcpu=gfx1030 -mattr=-wavefrontsize32,+wavefrontsize64 -run-pass=si-optimize-exec-masking -verify-machineinstrs %s -o - | FileCheck -check-prefix=GCN %s
+# RUN: llc -march=amdgcn -mcpu=gfx1010 -mattr=-wavefrontsize32,+wavefrontsize64 -run-pass=si-optimize-exec-masking -verify-machineinstrs %s -o - | FileCheck --check-prefixes=GCN,GFX1010 %s
+# RUN: llc -march=amdgcn -mcpu=gfx1030 -mattr=-wavefrontsize32,+wavefrontsize64 -run-pass=si-optimize-exec-masking -verify-machineinstrs %s -o - | FileCheck --check-prefixes=GCN,GFX1030 %s
 
 ---
 
@@ -22,3 +22,22 @@
     $sgpr2_sgpr3 = COPY $exec, implicit-def $exec
     $sgpr2_sgpr3 = S_AND_B64 killed renamable $sgpr2_sgpr3, killed renamable $sgpr0_sgpr1, implicit-def dead $scc
     $exec = S_MOV_B64_term killed renamable $sgpr2_sgpr3
+...
+
+---
+# Check if the modifiers are preserved when generating the V_CMPX instruction.
+
+# GCN-LABEL: name: vcmp_saveexec_to_mov_vcmpx_check_abs
+# GFX1010: V_CMP_LT_F32_e64
+# GFX1010: S_AND_SAVEEXEC_B64
+# GFX1030: S_MOV_B64
+# GFX1030-NEXT: V_CMPX_LT_F32_nosdst_e64 0, 953267991, 2
+name: vcmp_saveexec_to_mov_vcmpx_check_abs
+tracksRegLiveness: true
+body: |
+  bb.0:
+    liveins: $vgpr0
+    renamable $sgpr0_sgpr1 = V_CMP_LT_F32_e64 0, 953267991, 2, $vgpr0, 0, implicit $mode, implicit $exec
+    $sgpr2_sgpr3 = COPY $exec, implicit-def $exec
+    $sgpr2_sgpr3 = S_AND_B64 killed renamable $sgpr2_sgpr3, killed renamable $sgpr0_sgpr1, implicit-def dead $scc
+    $exec = S_MOV_B64_term killed renamable $sgpr2_sgpr3
Index: llvm/lib/Target/AMDGPU/SIOptimizeExecMasking.cpp
===================================================================
--- llvm/lib/Target/AMDGPU/SIOptimizeExecMasking.cpp
+++ llvm/lib/Target/AMDGPU/SIOptimizeExecMasking.cpp
@@ -451,20 +451,19 @@
   auto Builder = BuildMI(*VCmp.getParent(), std::next(InsertPosIt),
                          VCmp.getDebugLoc(), TII->get(NewOpcode));
 
-  if (AMDGPU::getNamedOperandIdx(NewOpcode, AMDGPU::OpName::src0_modifiers) !=
-      -1)
-    Builder.addImm(0);
+  auto TryAddImmediateValueFromNamedOperand =
+      [&](unsigned OperandName) -> void {
+    if (auto *Mod = TII->getNamedOperand(VCmp, OperandName))
+      Builder.addImm(Mod->getImm());
+  };
 
+  TryAddImmediateValueFromNamedOperand(AMDGPU::OpName::src0_modifiers);
   Builder.add(*Src0);
 
-  if (AMDGPU::getNamedOperandIdx(NewOpcode, AMDGPU::OpName::src1_modifiers) !=
-      -1)
-    Builder.addImm(0);
-
+  TryAddImmediateValueFromNamedOperand(AMDGPU::OpName::src1_modifiers);
   Builder.add(*Src1);
 
-  if (AMDGPU::getNamedOperandIdx(NewOpcode, AMDGPU::OpName::clamp) != -1)
-    Builder.addImm(0);
+  TryAddImmediateValueFromNamedOperand(AMDGPU::OpName::clamp);
 
   return true;
 }


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