[llvm] Adding support for G_STRICT_FMA in new reg bank select (PR #170330)

via llvm-commits llvm-commits at lists.llvm.org
Tue Dec 2 09:17:50 PST 2025


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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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<details>
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You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeHelper.cpp llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp --diff_from_common_commit
``````````

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in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp b/llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp
index feda40581..fd18a7f42 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp
@@ -931,17 +931,17 @@ RegBankLegalizeRules::RegBankLegalizeRules(const GCNSubtarget &_ST,
       .Uni(S64, {{Sgpr64}, {}});
 
   addRulesForGOpcs({G_STRICT_FMA}, Standard)
-    .Uni(V2S16, {{UniInVgprV2S16}, {VgprV2S16, VgprV2S16, VgprV2S16}})
-    .Div(V2S16, {{VgprV2S16}, {VgprV2S16, VgprV2S16, VgprV2S16}})
-    .Any({{UniV2S32}, {{UniInVgprV2S32}, {VgprV2S32, VgprV2S32, VgprV2S32}}})
-    .Any({{DivV2S32}, {{VgprV2S32}, {VgprV2S32, VgprV2S32, VgprV2S32}}})
-    .Div(S16, {{Vgpr16}, {Vgpr16, Vgpr16, Vgpr16}})
-    .Div(S32, {{Vgpr32}, {Vgpr32, Vgpr32, Vgpr32}})
-    .Div(S64, {{Vgpr64}, {Vgpr64, Vgpr64, Vgpr64}})
-    .Uni(S16, {{UniInVgprS16}, {Vgpr16, Vgpr16, Vgpr16}})
-    .Uni(S32, {{UniInVgprS32}, {Vgpr32, Vgpr32, Vgpr32}}) 
-    .Uni(S64, {{UniInVgprS64}, {Vgpr64, Vgpr64, Vgpr64}});
-  
+      .Uni(V2S16, {{UniInVgprV2S16}, {VgprV2S16, VgprV2S16, VgprV2S16}})
+      .Div(V2S16, {{VgprV2S16}, {VgprV2S16, VgprV2S16, VgprV2S16}})
+      .Any({{UniV2S32}, {{UniInVgprV2S32}, {VgprV2S32, VgprV2S32, VgprV2S32}}})
+      .Any({{DivV2S32}, {{VgprV2S32}, {VgprV2S32, VgprV2S32, VgprV2S32}}})
+      .Div(S16, {{Vgpr16}, {Vgpr16, Vgpr16, Vgpr16}})
+      .Div(S32, {{Vgpr32}, {Vgpr32, Vgpr32, Vgpr32}})
+      .Div(S64, {{Vgpr64}, {Vgpr64, Vgpr64, Vgpr64}})
+      .Uni(S16, {{UniInVgprS16}, {Vgpr16, Vgpr16, Vgpr16}})
+      .Uni(S32, {{UniInVgprS32}, {Vgpr32, Vgpr32, Vgpr32}})
+      .Uni(S64, {{UniInVgprS64}, {Vgpr64, Vgpr64, Vgpr64}});
+
   addRulesForGOpcs({G_BLOCK_ADDR}).Any({{UniP0}, {{SgprP0}, {}}});
 
   addRulesForGOpcs({G_GLOBAL_VALUE})

``````````

</details>


https://github.com/llvm/llvm-project/pull/170330


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