[AMDGPU] Add test for VALU hoisiting from WWM region. NFC. #123234
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@llvm/pr-subscribers-backend-amdgpu Author: Stanislav Mekhanoshin (rampitec) ChangesThe test demonstraits a suboptimal VALU hoisting from a WWM Full diff: https://github.com/llvm/llvm-project/pull/123234.diff 1 Files Affected:
diff --git a/llvm/test/CodeGen/AMDGPU/licm-wwm.mir b/llvm/test/CodeGen/AMDGPU/licm-wwm.mir
new file mode 100644
index 00000000000000..96659fcb716450
--- /dev/null
+++ b/llvm/test/CodeGen/AMDGPU/licm-wwm.mir
@@ -0,0 +1,43 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
+# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1100 -run-pass=early-machinelicm,si-wqm -o - %s | FileCheck -check-prefix=GCN %s
+
+---
+name: licm_move_wwm
+tracksRegLiveness: true
+body: |
+ ; GCN-LABEL: name: licm_move_wwm
+ ; GCN: bb.0:
+ ; GCN-NEXT: successors: %bb.1(0x80000000)
+ ; GCN-NEXT: {{ $}}
+ ; GCN-NEXT: [[ENTER_STRICT_WWM:%[0-9]+]]:sreg_32 = ENTER_STRICT_WWM -1, implicit-def $exec, implicit-def $scc, implicit $exec
+ ; GCN-NEXT: [[V_MOV_B32_e32_:%[0-9]+]]:vgpr_32 = V_MOV_B32_e32 1, implicit $exec
+ ; GCN-NEXT: $exec_lo = EXIT_STRICT_WWM [[ENTER_STRICT_WWM]]
+ ; GCN-NEXT: S_BRANCH %bb.1
+ ; GCN-NEXT: {{ $}}
+ ; GCN-NEXT: bb.1:
+ ; GCN-NEXT: successors: %bb.1(0x40000000), %bb.2(0x40000000)
+ ; GCN-NEXT: {{ $}}
+ ; GCN-NEXT: [[ENTER_STRICT_WWM1:%[0-9]+]]:sreg_32 = ENTER_STRICT_WWM -1, implicit-def $exec, implicit-def $scc, implicit $exec
+ ; GCN-NEXT: [[V_READFIRSTLANE_B32_:%[0-9]+]]:sreg_32 = V_READFIRSTLANE_B32 [[V_MOV_B32_e32_]], implicit $exec
+ ; GCN-NEXT: $exec_lo = EXIT_STRICT_WWM [[ENTER_STRICT_WWM1]]
+ ; GCN-NEXT: [[COPY:%[0-9]+]]:sreg_32 = COPY [[V_READFIRSTLANE_B32_]]
+ ; GCN-NEXT: $exec_lo = S_OR_B32 $exec_lo, [[COPY]], implicit-def $scc
+ ; GCN-NEXT: S_CBRANCH_EXECNZ %bb.1, implicit $exec
+ ; GCN-NEXT: S_BRANCH %bb.2
+ ; GCN-NEXT: {{ $}}
+ ; GCN-NEXT: bb.2:
+ ; GCN-NEXT: S_ENDPGM 0
+ bb.0:
+ S_BRANCH %bb.1
+
+ bb.1:
+ %0:vgpr_32 = V_MOV_B32_e32 1, implicit $exec
+ %1:sreg_32 = V_READFIRSTLANE_B32 killed %0:vgpr_32, implicit $exec
+ early-clobber %2:sreg_32 = STRICT_WWM killed %1:sreg_32, implicit $exec
+ $exec_lo = S_OR_B32 $exec_lo, %2, implicit-def $scc
+ S_CBRANCH_EXECNZ %bb.1, implicit $exec
+ S_BRANCH %bb.2
+
+ bb.2:
+ S_ENDPGM 0
+...
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arsenm
approved these changes
Jan 17, 2025
The test demonstraits a suboptimal VALU hoisting from a WWM region. As a result we have 2 WWM regions instead of one.
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/73/builds/11915 Here is the relevant piece of the build log for the reference |
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The test demonstraits a suboptimal VALU hoisting from a WWM
region. As a result we have 2 WWM regions instead of one.