AMDGPU: Handle gfx950 XDL-write-VGPR-Overlap-Src-AB wait state #126732

VigneshwarJ · 2025-02-11T14:13:49Z

gfx950 needs more additional waitstates from gfx940

llvmbot · 2025-02-11T14:14:24Z

@llvm/pr-subscribers-backend-amdgpu

Author: Vigneshwar Jayakumar (VigneshwarJ)

Changes

gfx950 needs more additional waitstates from gfx940

Full diff: https://github.com/llvm/llvm-project/pull/126732.diff

3 Files Affected:

(modified) llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp (+9-7)
(modified) llvm/test/CodeGen/AMDGPU/mai-hazards-gfx940.mir (+40-20)
(modified) llvm/test/CodeGen/AMDGPU/mai-hazards-mfma-scale.gfx950.mir (+2-2)

diff --git a/llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp b/llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp
index a21702af11a984..73b44680aad5d7 100644
--- a/llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp
+++ b/llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp
@@ -2290,12 +2290,14 @@ GFX940_SMFMA_N_PassWritesVGPROverlappedSrcABWaitStates(int NumPasses) {
   return NumPasses + 2;
 }
 
-static int GFX940_XDL_N_PassWritesVGPROverlappedSrcABWaitStates(int NumPasses) {
-  // 2 pass -> 5
-  // 4 pass -> 7
-  // 8 pass -> 11
-  // 16 pass -> 19
-  return NumPasses + 3;
+static int GFX940_XDL_N_PassWritesVGPROverlappedSrcABWaitStates(int NumPasses,
+                                                                bool IsGFX950) {
+  // xdl def cycles | gfx940 | gfx950
+  // 2 pass         |  5        5
+  // 4 pass         |  7        8
+  // 8 pass         |  11       12
+  // 16 pass        |  19       20
+  return NumPasses + 3 + (NumPasses != 2 && IsGFX950);
 }
 
 int GCNHazardRecognizer::checkMAIHazards90A(MachineInstr *MI) {
@@ -2464,7 +2466,7 @@ int GCNHazardRecognizer::checkMAIHazards90A(MachineInstr *MI) {
           NeedWaitStates =
               isXDL(ST, *MI1)
                   ? GFX940_XDL_N_PassWritesVGPROverlappedSrcABWaitStates(
-                        NumPasses)
+                        NumPasses, ST.hasGFX950Insts())
                   : GFX940_SMFMA_N_PassWritesVGPROverlappedSrcABWaitStates(
                         NumPasses);
           break;
diff --git a/llvm/test/CodeGen/AMDGPU/mai-hazards-gfx940.mir b/llvm/test/CodeGen/AMDGPU/mai-hazards-gfx940.mir
index 52891989b88fbd..1eb7ec4c142f20 100644
--- a/llvm/test/CodeGen/AMDGPU/mai-hazards-gfx940.mir
+++ b/llvm/test/CodeGen/AMDGPU/mai-hazards-gfx940.mir
@@ -417,7 +417,8 @@ body:             |
 # GCN-LABEL: name: xdl_sgemm16x16_mfma_write_agpr_mfma_srca_read_overlap
 # GCN:      V_MFMA
 # GCN-NEXT: S_NOP 7
-# GCN-NEXT: S_NOP 2
+# GFX940-NEXT: S_NOP 2
+# GFX950-NEXT: S_NOP 3
 # GCN-NEXT: V_MFMA
 name:            xdl_sgemm16x16_mfma_write_agpr_mfma_srca_read_overlap
 body:             |
@@ -439,7 +440,8 @@ body:             |
 # GCN-LABEL: name: smfmac32x32_write_agpr_mfma_srca_read_overlap
 # GCN:      V_SMFMAC
 # GCN-NEXT: S_NOP 7
-# GCN-NEXT: S_NOP 2
+# GFX940-NEXT: S_NOP 2
+# GFX950-NEXT: S_NOP 3
 # GCN-NEXT: V_MFMA
 name:            smfmac32x32_write_agpr_mfma_srca_read_overlap
 body:             |
@@ -450,7 +452,8 @@ body:             |
 # GCN-LABEL: name: smfmac32x32_write_agpr_smfmac_srcc_read_overlap
 # GCN:      V_SMFMAC
 # GCN-NEXT: S_NOP 7
-# GCN-NEXT: S_NOP 2
+# GFX940-NEXT: S_NOP 2
+# GFX950-NEXT: S_NOP 3
 # GCN-NEXT: V_SMFMAC
 name:            smfmac32x32_write_agpr_smfmac_srcc_read_overlap
 body:             |
@@ -462,7 +465,8 @@ body:             |
 # GCN:      V_MFMA
 # GCN-NEXT: S_NOP 7
 # GCN-NEXT: S_NOP 7
-# GCN-NEXT: S_NOP 2
+# GFX940-NEXT: S_NOP 2
+# GFX950-NEXT: S_NOP 3
 # GCN-NEXT: V_MFMA
 name:            xdl_sgemm32x32_mfma_write_agpr_mfma_srca_read_overlap
 body:             |
@@ -1715,7 +1719,8 @@ body:             |
 ...
 # GCN-LABEL: name: xdl_sgemm16X16X16_mfma_write_agpr_mfma_srca_read_overlap
 # GCN:      V_MFMA
-# GCN-NEXT: S_NOP 6
+# GFX940-NEXT: S_NOP 6
+# GFX950-NEXT: S_NOP 7
 # GCN-NEXT: V_MFMA
 name:            xdl_sgemm16X16X16_mfma_write_agpr_mfma_srca_read_overlap
 body:             |
@@ -1725,7 +1730,8 @@ body:             |
 ...
 # GCN-LABEL: name: xdl_sgemm16X16X32_mfma_write_agpr_mfma_srcb_read_overlap
 # GCN:      V_MFMA
-# GCN-NEXT: S_NOP 6
+# GFX940-NEXT: S_NOP 6
+# GFX950-NEXT: S_NOP 7
 # GCN-NEXT: V_MFMA
 name:            xdl_sgemm16X16X32_mfma_write_agpr_mfma_srcb_read_overlap
 body:             |
@@ -1735,7 +1741,8 @@ body:             |
 ...
 # GCN-LABEL: name: xdl_sgemm16X16X16_mfma_write_vgpr_dmfma16x16_srca_read_overlap
 # GCN:      V_MFMA
-# GCN-NEXT: S_NOP 6
+# GFX940-NEXT: S_NOP 6
+# GFX950-NEXT: S_NOP 7
 # GCN-NEXT: V_MFMA
 name:            xdl_sgemm16X16X16_mfma_write_vgpr_dmfma16x16_srca_read_overlap
 body:             |
@@ -1826,7 +1833,8 @@ body:             |
 ...
 # GCN-LABEL: name: smfmac16x16x32_mfma_write_vgpr_smfmac_read_idx
 # GCN:      V_SMFMAC
-# GCN-NEXT: S_NOP 6
+# GFX940-NEXT: S_NOP 6
+# GFX950-NEXT: S_NOP 7
 # GCN-NEXT: V_SMFMAC
 name:            smfmac16x16x32_mfma_write_vgpr_smfmac_read_idx
 body:             |
@@ -2188,7 +2196,8 @@ body:             |
 # 4 pass source
 # GCN-LABEL: name: xdl_mfma_4pass_write_vgpr_xdl_mfma_read_overlap_srca
 # GCN:      V_MFMA
-# GCN-NEXT: S_NOP 6
+# GFX940-NEXT: S_NOP 6
+# GFX950-NEXT: S_NOP 7
 # GCN-NEXT: V_MFMA
 name:            xdl_mfma_4pass_write_vgpr_xdl_mfma_read_overlap_srca
 body:             |
@@ -2202,7 +2211,8 @@ body:             |
 # 4 pass source
 # GCN-LABEL: name: xdl_mfma_4pass_write_vgpr_xdl_mfma_read_overlap_srcb
 # GCN:      V_MFMA
-# GCN-NEXT: S_NOP 6
+# GFX940-NEXT: S_NOP 6
+# GFX950-NEXT: S_NOP 7
 # GCN-NEXT: V_MFMA
 name:            xdl_mfma_4pass_write_vgpr_xdl_mfma_read_overlap_srcb
 body:             |
@@ -2276,7 +2286,8 @@ body:             |
 # 4 pass source
 # GCN-LABEL: name: xdl_mfma_4pass_write_vgpr_sgemm_mfma_read_overlap_srca
 # GCN:      V_MFMA
-# GCN-NEXT: S_NOP 6
+# GFX940-NEXT: S_NOP 6
+# GFX950-NEXT: S_NOP 7
 # GCN-NEXT: V_MFMA
 name:            xdl_mfma_4pass_write_vgpr_sgemm_mfma_read_overlap_srca
 body:             |
@@ -2290,7 +2301,8 @@ body:             |
 # 4 pass source
 # GCN-LABEL: name: xdl_mfma_4pass_write_vgpr_sgemm_mfma_read_overlap_srcb
 # GCN:      V_MFMA
-# GCN-NEXT: S_NOP 6
+# GFX940-NEXT: S_NOP 6
+# GFX950-NEXT: S_NOP 7
 # GCN-NEXT: V_MFMA
 name:            xdl_mfma_4pass_write_vgpr_sgemm_mfma_read_overlap_srcb
 body:             |
@@ -2321,7 +2333,8 @@ body:             |
 # GCN-LABEL: name: xdl_mfma_8pass_write_vgpr_nonxdl_sgemm_mfma_read_overlap_srca
 # GCN:      V_MFMA
 # GCN-NEXT: S_NOP 7
-# GCN-NEXT: S_NOP 2
+# GFX940-NEXT: S_NOP 2
+# GFX950-NEXT: S_NOP 3
 # GCN-NEXT: V_MFMA
 name: xdl_mfma_8pass_write_vgpr_nonxdl_sgemm_mfma_read_overlap_srca
 body:             |
@@ -2336,7 +2349,8 @@ body:             |
 # GCN-LABEL: name: xdl_mfma_8pass_write_vgpr_nonxdl_sgemm_mfma_read_overlap_srcb
 # GCN:      V_MFMA
 # GCN-NEXT: S_NOP 7
-# GCN-NEXT: S_NOP 2
+# GFX940-NEXT: S_NOP 2
+# GFX950-NEXT: S_NOP 3
 # GCN-NEXT: V_MFMA
 name: xdl_mfma_8pass_write_vgpr_nonxdl_sgemm_mfma_read_overlap_srcb
 body:             |
@@ -2370,7 +2384,8 @@ body:             |
 # GCN:      V_MFMA
 # GCN-NEXT: S_NOP 7
 # GCN-NEXT: S_NOP 7
-# GCN-NEXT: S_NOP 2
+# GFX940-NEXT: S_NOP 2
+# GFX950-NEXT: S_NOP 3
 # GCN-NEXT: V_MFMA
 name:            xdl_16pass_write_vgpr_nonxdl_sgemm_mfma_read_overlap_srca
 body:             |
@@ -2386,7 +2401,8 @@ body:             |
 # GCN:      V_MFMA
 # GCN-NEXT: S_NOP 7
 # GCN-NEXT: S_NOP 7
-# GCN-NEXT: S_NOP 2
+# GFX940-NEXT: S_NOP 2
+# GFX950-NEXT: S_NOP 3
 # GCN-NEXT: V_MFMA
 name:            xdl_16pass_write_vgpr_nonxdl_sgemm_mfma_read_overlap_srcb
 body:             |
@@ -2456,7 +2472,8 @@ body:             |
 # GCN-LABEL: name: xdl_mfma_8pass_write_vgpr_xdl_mfma_read_overlap_srca
 # GCN:      V_MFMA
 # GCN-NEXT: S_NOP 7
-# GCN-NEXT: S_NOP 2
+# GFX940-NEXT: S_NOP 2
+# GFX950-NEXT: S_NOP 3
 # GCN-NEXT: V_MFMA
 name:            xdl_mfma_8pass_write_vgpr_xdl_mfma_read_overlap_srca
 body:             |
@@ -2470,7 +2487,8 @@ body:             |
 # GCN-LABEL: name: xdl_mfma_8pass_write_vgpr_xdl_mfma_read_overlap_srcb
 # GCN:      V_MFMA
 # GCN-NEXT: S_NOP 7
-# GCN-NEXT: S_NOP 2
+# GFX940-NEXT: S_NOP 2
+# GFX950-NEXT: S_NOP 3
 # GCN-NEXT: V_MFMA
 name:            xdl_mfma_8pass_write_vgpr_xdl_mfma_read_overlap_srcb
 body:             |
@@ -2502,7 +2520,8 @@ body:             |
 # GCN:      V_MFMA
 # GCN-NEXT: S_NOP 7
 # GCN-NEXT: S_NOP 7
-# GCN-NEXT: S_NOP 2
+# GFX940-NEXT: S_NOP 2
+# GFX950-NEXT: S_NOP 3
 # GCN-NEXT: V_MFMA
 name:            xdl_16pass_write_vgpr_xdl_mfma_read_overlap_srca
 body:             |
@@ -2519,7 +2538,8 @@ body:             |
 # GCN:      V_MFMA
 # GCN-NEXT: S_NOP 7
 # GCN-NEXT: S_NOP 7
-# GCN-NEXT: S_NOP 2
+# GFX940-NEXT: S_NOP 2
+# GFX950-NEXT: S_NOP 3
 # GCN-NEXT: V_MFMA
 name:            xdl_16pass_write_vgpr_xdl_mfma_read_overlap_srcb
 body:             |
diff --git a/llvm/test/CodeGen/AMDGPU/mai-hazards-mfma-scale.gfx950.mir b/llvm/test/CodeGen/AMDGPU/mai-hazards-mfma-scale.gfx950.mir
index 433236180b1375..4585eca8fe894a 100644
--- a/llvm/test/CodeGen/AMDGPU/mai-hazards-mfma-scale.gfx950.mir
+++ b/llvm/test/CodeGen/AMDGPU/mai-hazards-mfma-scale.gfx950.mir
@@ -254,7 +254,7 @@ body:             |
     ; GCN-NEXT: {{  $}}
     ; GCN-NEXT: renamable $vgpr0_vgpr1_vgpr2_vgpr3 = nofpexcept V_MFMA_SCALE_F32_16X16X128_F8F6F4_f8_f8_vgprcd_e64 $vgpr0_vgpr1_vgpr2_vgpr3_vgpr4_vgpr5_vgpr6_vgpr7, $vgpr8_vgpr9_vgpr10_vgpr11_vgpr12_vgpr13_vgpr14_vgpr15, $vgpr16_vgpr17_vgpr18_vgpr19, 0, 0, $sgpr4, $vgpr21, 12, 4, implicit $mode, implicit $exec
     ; GCN-NEXT: S_NOP 7
-    ; GCN-NEXT: S_NOP 2
+    ; GCN-NEXT: S_NOP 3
     ; GCN-NEXT: renamable $vgpr0_vgpr1_vgpr2_vgpr3 = nofpexcept V_MFMA_SCALE_F32_16X16X128_F8F6F4_f8_f8_vgprcd_e64 killed $vgpr0_vgpr1_vgpr2_vgpr3_vgpr4_vgpr5_vgpr6_vgpr7, killed $vgpr8_vgpr9_vgpr10_vgpr11_vgpr12_vgpr13_vgpr14_vgpr15, killed $vgpr2_vgpr3_vgpr4_vgpr5, 0, 0, killed $sgpr4, killed $vgpr21, 12, 4, implicit $mode, implicit $exec
     ; GCN-NEXT: S_SETPC_B64_return undef $sgpr30_sgpr31, implicit $vgpr0, implicit $vgpr1, implicit $vgpr2, implicit $vgpr3
     renamable $vgpr0_vgpr1_vgpr2_vgpr3 = nofpexcept V_MFMA_SCALE_F32_16X16X128_F8F6F4_f8_f8_vgprcd_e64 $vgpr0_vgpr1_vgpr2_vgpr3_vgpr4_vgpr5_vgpr6_vgpr7, $vgpr8_vgpr9_vgpr10_vgpr11_vgpr12_vgpr13_vgpr14_vgpr15, $vgpr16_vgpr17_vgpr18_vgpr19, 0, 0, $sgpr4, $vgpr21, 12, 4, implicit $mode, implicit $exec
@@ -275,7 +275,7 @@ body:             |
     ; GCN: liveins: $vgpr0, $vgpr1, $vgpr2, $vgpr3, $vgpr4, $vgpr5, $vgpr6, $vgpr7, $vgpr8, $vgpr9, $vgpr10, $vgpr11, $vgpr12, $vgpr13, $vgpr14, $vgpr15, $vgpr16, $vgpr17, $vgpr18, $vgpr19, $vgpr20, $vgpr21, $vgpr22, $vgpr23, $vgpr24, $vgpr25, $vgpr26, $vgpr27, $vgpr28, $vgpr29, $vgpr30, $vgpr31, $vgpr32, $sgpr4
     ; GCN-NEXT: {{  $}}
     ; GCN-NEXT: renamable $vgpr0_vgpr1_vgpr2_vgpr3 = nofpexcept V_MFMA_SCALE_F32_16X16X128_F8F6F4_f8_f8_vgprcd_e64 $vgpr0_vgpr1_vgpr2_vgpr3_vgpr4_vgpr5_vgpr6_vgpr7, $vgpr8_vgpr9_vgpr10_vgpr11_vgpr12_vgpr13_vgpr14_vgpr15, $vgpr16_vgpr17_vgpr18_vgpr19, 2, 2, $sgpr4, $vgpr21, 12, 4, implicit $mode, implicit $exec
-    ; GCN-NEXT: S_NOP 6
+    ; GCN-NEXT: S_NOP 7
     ; GCN-NEXT: renamable $vgpr0_vgpr1_vgpr2_vgpr3 = nofpexcept V_MFMA_SCALE_F32_16X16X128_F8F6F4_f8_f8_vgprcd_e64 killed $vgpr0_vgpr1_vgpr2_vgpr3_vgpr4_vgpr5_vgpr6_vgpr7, killed $vgpr8_vgpr9_vgpr10_vgpr11_vgpr12_vgpr13_vgpr14_vgpr15, killed $vgpr2_vgpr3_vgpr4_vgpr5, 0, 0, killed $sgpr4, killed $vgpr21, 12, 4, implicit $mode, implicit $exec
     ; GCN-NEXT: S_SETPC_B64_return undef $sgpr30_sgpr31, implicit $vgpr0, implicit $vgpr1, implicit $vgpr2, implicit $vgpr3
     renamable $vgpr0_vgpr1_vgpr2_vgpr3 = nofpexcept V_MFMA_SCALE_F32_16X16X128_F8F6F4_f8_f8_vgprcd_e64 $vgpr0_vgpr1_vgpr2_vgpr3_vgpr4_vgpr5_vgpr6_vgpr7, $vgpr8_vgpr9_vgpr10_vgpr11_vgpr12_vgpr13_vgpr14_vgpr15, $vgpr16_vgpr17_vgpr18_vgpr19, 2, 2, $sgpr4, $vgpr21, 12, 4, implicit $mode, implicit $exec

arsenm · 2025-02-11T15:30:44Z

/cherry-pick c837f57

llvmbot · 2025-02-11T15:35:57Z

Failed to create pull request for issue126732 https://github.com/llvm/llvm-project/actions/runs/13266502917

llvmbot · 2025-02-11T15:37:53Z

/pull-request #126744

Pulls in llvm/llvm-project#126132, llvm/llvm-project#126727 and llvm/llvm-project#126732 for fixing wait states of gfx950 mfma ops. They are needed for triton-lang#5831.

Pulls in * llvm/llvm-project#126132 * llvm/llvm-project#126727 * llvm/llvm-project#126732 for fixing wait states of gfx950 mfma ops.

…126732) gfx950 needs more additional waitstates from gfx940 (cherry picked from commit c837f57)

…126732) gfx950 needs more additional waitstates from gfx940

Pulls in * llvm/llvm-project#126132 * llvm/llvm-project#126727 * llvm/llvm-project#126732 for fixing wait states of gfx950 mfma ops.

…126732) gfx950 needs more additional waitstates from gfx940

Pulls in * llvm/llvm-project#126132 * llvm/llvm-project#126727 * llvm/llvm-project#126732 for fixing wait states of gfx950 mfma ops.

…126732) gfx950 needs more additional waitstates from gfx940

AMDGPU: Handle gfx950 XDL-write-VGPR-Overlap-Src-AB wait state

ace2100

gfx950 needs more additional waitstates from gfx940

llvmbot added the backend:AMDGPU label Feb 11, 2025

Merge branch 'main' into gfx950_XDL_VGPROverlappedSrcABWaitStates

3f159ad

VigneshwarJ mentioned this pull request Feb 11, 2025

AMDGPU: Handle gfx950 XDL Write-VGPR-VALU-WAW wait state change #126132

Merged

arsenm approved these changes Feb 11, 2025

View reviewed changes

arsenm merged commit c837f57 into llvm:main Feb 11, 2025
8 checks passed

arsenm added this to the LLVM 20.X Release milestone Feb 11, 2025

This was referenced Feb 11, 2025

[BACKEND] Bump to llvm/llvm-project@1188b1ff7b95 triton-lang/triton#5884

Merged

Bump llvm to 1188b1ff triton-lang/triton#5886

Closed

antiagainst mentioned this pull request Feb 11, 2025

Update llvm to 1188b1ff triton-lang/triton#5887

Merged

antiagainst pushed a commit to triton-lang/triton that referenced this pull request Feb 11, 2025

Update llvm to 1188b1ff (#5887)

0988aee

Pulls in * llvm/llvm-project#126132 * llvm/llvm-project#126727 * llvm/llvm-project#126732 for fixing wait states of gfx950 mfma ops.

swift-ci pushed a commit to swiftlang/llvm-project that referenced this pull request Feb 11, 2025

AMDGPU: Handle gfx950 XDL-write-VGPR-Overlap-Src-AB wait state (llvm#…

203cd18

…126732) gfx950 needs more additional waitstates from gfx940 (cherry picked from commit c837f57)

Icohedron pushed a commit to Icohedron/llvm-project that referenced this pull request Feb 11, 2025

AMDGPU: Handle gfx950 XDL-write-VGPR-Overlap-Src-AB wait state (llvm#…

45e24db

…126732) gfx950 needs more additional waitstates from gfx940

joaosaffran pushed a commit to joaosaffran/llvm-project that referenced this pull request Feb 14, 2025

AMDGPU: Handle gfx950 XDL-write-VGPR-Overlap-Src-AB wait state (llvm#…

224b1c9

…126732) gfx950 needs more additional waitstates from gfx940

chsigg pushed a commit to triton-lang/triton that referenced this pull request Feb 20, 2025

Update llvm to 1188b1ff (#5887)

fd85450

Pulls in * llvm/llvm-project#126132 * llvm/llvm-project#126727 * llvm/llvm-project#126732 for fixing wait states of gfx950 mfma ops.

sivan-shani pushed a commit to sivan-shani/llvm-project that referenced this pull request Feb 24, 2025

AMDGPU: Handle gfx950 XDL-write-VGPR-Overlap-Src-AB wait state (llvm#…

702e1e1

…126732) gfx950 needs more additional waitstates from gfx940

jrbyrnes pushed a commit to jrbyrnes/llvm-project that referenced this pull request May 1, 2025

AMDGPU: Handle gfx950 XDL-write-VGPR-Overlap-Src-AB wait state (llvm#…

d51034c

…126732) gfx950 needs more additional waitstates from gfx940

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