AMDGPU: Handle gfx950 change in mfma_f64_16x16x4 + valu hazard #117262
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This was referenced Nov 21, 2024
arsenm
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@llvm/pr-subscribers-backend-amdgpu Author: Matt Arsenault (arsenm) ChangesIncrease from 11 wait states to 19 Full diff: https://github.com/llvm/llvm-project/pull/117262.diff 2 Files Affected:
diff --git a/llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp b/llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp
index 44afccb0690d0d..99a176731599cc 100644
--- a/llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp
+++ b/llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp
@@ -2603,6 +2603,7 @@ int GCNHazardRecognizer::checkMAIVALUHazards(MachineInstr *MI) {
const int DMFMA16x16WriteVgprMemExpReadWaitStates = 18;
const int DMFMA4x4WriteVgprVALUReadWaitStates = 6;
const int DMFMA16x16WriteVgprVALUReadWaitStates = 11;
+ const int GFX950_DMFMA16x16WriteVgprVALUReadWaitStates = 19;
const int DotWriteSameDotReadSrcAB = 3;
const int DotWriteDifferentVALURead = 3;
const int DMFMABetweenVALUWriteVMEMRead = 2;
@@ -2663,9 +2664,12 @@ int GCNHazardRecognizer::checkMAIVALUHazards(MachineInstr *MI) {
break;
case 8:
case 16:
- NeedWaitStates = IsMemOrExport
- ? DMFMA16x16WriteVgprMemExpReadWaitStates
- : DMFMA16x16WriteVgprVALUReadWaitStates;
+ NeedWaitStates =
+ IsMemOrExport
+ ? DMFMA16x16WriteVgprMemExpReadWaitStates
+ : (ST.hasGFX950Insts()
+ ? GFX950_DMFMA16x16WriteVgprVALUReadWaitStates
+ : DMFMA16x16WriteVgprVALUReadWaitStates);
break;
default:
llvm_unreachable("unexpected dgemm");
diff --git a/llvm/test/CodeGen/AMDGPU/mai-hazards-gfx940.mir b/llvm/test/CodeGen/AMDGPU/mai-hazards-gfx940.mir
index 9681b01f334f9a..d2b2f226404da8 100644
--- a/llvm/test/CodeGen/AMDGPU/mai-hazards-gfx940.mir
+++ b/llvm/test/CodeGen/AMDGPU/mai-hazards-gfx940.mir
@@ -1,4 +1,5 @@
-# RUN: llc -mtriple=amdgcn -mcpu=gfx940 -verify-machineinstrs -run-pass post-RA-hazard-rec %s -o - | FileCheck -check-prefix=GCN %s
+# RUN: llc -mtriple=amdgcn -mcpu=gfx940 -verify-machineinstrs -run-pass post-RA-hazard-rec %s -o - | FileCheck -check-prefixes=GCN,GFX940 %s
+# RUN: llc -mtriple=amdgcn -mcpu=gfx950 -verify-machineinstrs -run-pass post-RA-hazard-rec %s -o - | FileCheck -check-prefixes=GCN,GFX950 %s
# GCN-LABEL: name: valu_write_vgpr_sgemm_mfma_read
# GCN: V_MOV_B32
@@ -803,8 +804,12 @@ body: |
...
# GCN-LABEL: name: dmfma16x16_write_vgpr_valu_read
# GCN: V_MFMA
-# GCN-NEXT: S_NOP 7
-# GCN-NEXT: S_NOP 2
+# GFX940-NEXT: S_NOP 7
+# GFX940-NEXT: S_NOP 2
+
+# GFX950-NEXT: S_NOP 7
+# GFX950-NEXT: S_NOP 7
+# GFX950-NEXT: S_NOP 2
# GCN-NEXT: V_MOV_B32
name: dmfma16x16_write_vgpr_valu_read
body: |
@@ -867,8 +872,13 @@ body: |
...
# GCN-LABEL: name: dmfma16x16_write_vgpr_dot_read
# GCN: V_MFMA
-# GCN-NEXT: S_NOP 7
-# GCN-NEXT: S_NOP 2
+# GFX940-NEXT: S_NOP 7
+# GFX940-NEXT: S_NOP 2
+
+# GFX950-NEXT: S_NOP 7
+# GFX950-NEXT: S_NOP 7
+# GFX950-NEXT: S_NOP 2
+
# GCN-NEXT: V_DOT
name: dmfma16x16_write_vgpr_dot_read
body: |
@@ -1505,8 +1515,12 @@ body: |
...
# GCN-LABEL: name: dmfma16x16_write_agpr_valu_read
# GCN: V_MFMA
-# GCN-NEXT: S_NOP 7
-# GCN-NEXT: S_NOP 2
+# GFX940-NEXT: S_NOP 7
+# GFX940-NEXT: S_NOP 2
+
+# GFX950-NEXT: S_NOP 7
+# GFX950-NEXT: S_NOP 7
+# GFX950-NEXT: S_NOP 2
# GCN-NEXT: V_ACCVGPR_READ_B32_e64
name: dmfma16x16_write_agpr_valu_read
body: |
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Increase from 11 wait states to 19
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Increase from 11 wait states to 19