[llvm] ccf5b3e - [AMDGPU][GlobalISel] Add RegBankLegalize support for G_READSTEADYCOUNTER (#163661)

[via llvm-commits]

Author: vangthao95
Date: 2025-10-16T09:45:33-07:00
New Revision: ccf5b3ed62ac70ccaf4648f06c89d98b3d2a800b

URL: https://github.com/llvm/llvm-project/commit/ccf5b3ed62ac70ccaf4648f06c89d98b3d2a800b
DIFF: https://github.com/llvm/llvm-project/commit/ccf5b3ed62ac70ccaf4648f06c89d98b3d2a800b.diff

LOG: [AMDGPU][GlobalISel] Add RegBankLegalize support for G_READSTEADYCOUNTER (#163661)

Added: 
    

Modified: 
    llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp
    llvm/test/CodeGen/AMDGPU/readsteadycounter.ll

Removed: 
    


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diff  --git a/llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp b/llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp
index bfe2c80c810ef..a67b12a22589c 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp
@@ -901,6 +901,8 @@ RegBankLegalizeRules::RegBankLegalizeRules(const GCNSubtarget &_ST,
 
   addRulesForGOpcs({G_ABS}, Standard).Uni(S16, {{Sgpr32Trunc}, {Sgpr32SExt}});
 
+  addRulesForGOpcs({G_READSTEADYCOUNTER}, Standard).Uni(S64, {{Sgpr64}, {}});
+
   bool hasSALUFloat = ST->hasSALUFloatInsts();
 
   addRulesForGOpcs({G_FADD}, Standard)

diff  --git a/llvm/test/CodeGen/AMDGPU/readsteadycounter.ll b/llvm/test/CodeGen/AMDGPU/readsteadycounter.ll
index ddbae6493aceb..a95d8c788c34c 100644
--- a/llvm/test/CodeGen/AMDGPU/readsteadycounter.ll
+++ b/llvm/test/CodeGen/AMDGPU/readsteadycounter.ll
@@ -1,8 +1,8 @@
 ; RUN: llc -global-isel=0 -mtriple=amdgcn -mcpu=gfx700 < %s | FileCheck %s -check-prefixes=GCN,GFX700
 ; RUN: llc -global-isel=0 -mtriple=amdgcn -mcpu=gfx900 < %s | FileCheck %s -check-prefixes=GCN,GFX900
-; RUN: llc -global-isel=1 -mtriple=amdgcn -mcpu=gfx900 < %s | FileCheck %s -check-prefixes=GCN,GFX900
+; RUN: llc -global-isel=1 -new-reg-bank-select -mtriple=amdgcn -mcpu=gfx900 < %s | FileCheck %s -check-prefixes=GCN,GFX900
 ; RUN: llc -global-isel=0 -mtriple=amdgcn -mcpu=gfx1100 < %s | FileCheck %s -check-prefixes=GCN,GFX1100
-; RUN: llc -global-isel=1 -mtriple=amdgcn -mcpu=gfx1100 < %s | FileCheck %s -check-prefixes=GCN,GFX1100
+; RUN: llc -global-isel=1 -new-reg-bank-select -mtriple=amdgcn -mcpu=gfx1100 < %s | FileCheck %s -check-prefixes=GCN,GFX1100
 
 declare i64 @llvm.readsteadycounter() #0