[llvm] AMDGPU/GlobalISel: RegBankLegalize rules for 64 bit s_min/max and u_min/max (PR #202076)

[Petar Avramovic via llvm-commits]

https://github.com/petar-avramovic created https://github.com/llvm/llvm-project/pull/202076

None

>From 7ac94f8992a209d225f4574e17456e87d94332f7 Mon Sep 17 00:00:00 2001
From: Petar Avramovic <Petar.Avramovic at amd.com>
Date: Sat, 6 Jun 2026 21:00:55 +0200
Subject: [PATCH] AMDGPU/GlobalISel: RegBankLegalize rules for 64 bit s_min/max
 and u_min/max

---
 llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp | 8 ++++++--
 llvm/test/CodeGen/AMDGPU/GlobalISel/minmaxabs-i64.ll  | 2 +-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp b/llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp
index e5bab2bbdfa25..d025dd518b96a 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp
@@ -655,7 +655,9 @@ RegBankLegalizeRules::RegBankLegalizeRules(const GCNSubtarget &_ST,
       .Uni(S32, {{Sgpr32}, {Sgpr32, Sgpr32}})
       .Div(S32, {{Vgpr32}, {Vgpr32, Vgpr32}})
       .Uni(V2S16, {{SgprV2S16}, {SgprV2S16, SgprV2S16}, UnpackMinMax})
-      .Div(V2S16, {{VgprV2S16}, {VgprV2S16, VgprV2S16}});
+      .Div(V2S16, {{VgprV2S16}, {VgprV2S16, VgprV2S16}})
+      .Uni(S64, {{UniInVgprS64}, {Vgpr64, Vgpr64}})
+      .Div(S64, {{Vgpr64}, {Vgpr64, Vgpr64}});
 
   addRulesForGOpcs({G_UMIN, G_UMAX}, Standard)
       .Uni(S16, {{Sgpr32Trunc}, {Sgpr32ZExt, Sgpr32ZExt}})
@@ -663,7 +665,9 @@ RegBankLegalizeRules::RegBankLegalizeRules(const GCNSubtarget &_ST,
       .Uni(S32, {{Sgpr32}, {Sgpr32, Sgpr32}})
       .Div(S32, {{Vgpr32}, {Vgpr32, Vgpr32}})
       .Uni(V2S16, {{SgprV2S16}, {SgprV2S16, SgprV2S16}, UnpackMinMax})
-      .Div(V2S16, {{VgprV2S16}, {VgprV2S16, VgprV2S16}});
+      .Div(V2S16, {{VgprV2S16}, {VgprV2S16, VgprV2S16}})
+      .Uni(S64, {{UniInVgprS64}, {Vgpr64, Vgpr64}})
+      .Div(S64, {{Vgpr64}, {Vgpr64, Vgpr64}});
 
   addRulesForGOpcs({G_IMPLICIT_DEF})
       .Any({{UniS1}, {{Sgpr32Trunc}, {}}})
diff --git a/llvm/test/CodeGen/AMDGPU/GlobalISel/minmaxabs-i64.ll b/llvm/test/CodeGen/AMDGPU/GlobalISel/minmaxabs-i64.ll
index 6a7725d19086a..74f6aaa2bd7e2 100644
--- a/llvm/test/CodeGen/AMDGPU/GlobalISel/minmaxabs-i64.ll
+++ b/llvm/test/CodeGen/AMDGPU/GlobalISel/minmaxabs-i64.ll
@@ -1,5 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -global-isel -mtriple=amdgcn-unknown-amdhsa -mcpu=gfx1250 < %s | FileCheck %s
+; RUN: llc -global-isel -new-reg-bank-select -mtriple=amdgcn-unknown-amdhsa -mcpu=gfx1250 < %s | FileCheck %s
 
 declare i64 @llvm.umin.i64(i64, i64)
 declare i64 @llvm.umax.i64(i64, i64)