[llvm] [AMDGPU] Fix a crash by skipping DBG instrs at start of sched region (PR #131167)
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Thu Mar 13 09:41:03 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-backend-amdgpu
Author: Emma Pilkington (epilk)
<details>
<summary>Changes</summary>
Fixes SWDEV-514946
---
Full diff: https://github.com/llvm/llvm-project/pull/131167.diff
2 Files Affected:
- (modified) llvm/lib/Target/AMDGPU/GCNSchedStrategy.cpp (+2)
- (added) llvm/test/CodeGen/AMDGPU/dbg-value-starts-sched-region.mir (+30)
``````````diff
diff --git a/llvm/lib/Target/AMDGPU/GCNSchedStrategy.cpp b/llvm/lib/Target/AMDGPU/GCNSchedStrategy.cpp
index c277223de13ac..99a7dfe0ed20c 100644
--- a/llvm/lib/Target/AMDGPU/GCNSchedStrategy.cpp
+++ b/llvm/lib/Target/AMDGPU/GCNSchedStrategy.cpp
@@ -873,6 +873,8 @@ void GCNScheduleDAGMILive::computeBlockPressure(unsigned RegionIdx,
Pressure[CurRegion] = RPTracker.moveMaxPressure();
if (CurRegion-- == RegionIdx)
break;
+ auto &Rgn = Regions[CurRegion];
+ NonDbgMI = &*skipDebugInstructionsForward(Rgn.first, Rgn.second);
}
RPTracker.advanceToNext();
RPTracker.advanceBeforeNext();
diff --git a/llvm/test/CodeGen/AMDGPU/dbg-value-starts-sched-region.mir b/llvm/test/CodeGen/AMDGPU/dbg-value-starts-sched-region.mir
new file mode 100644
index 0000000000000..2fb9acf36bb5d
--- /dev/null
+++ b/llvm/test/CodeGen/AMDGPU/dbg-value-starts-sched-region.mir
@@ -0,0 +1,30 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
+# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx942 -verify-machineinstrs -run-pass=machine-scheduler -o - %s | FileCheck %s
+
+# Verify we maintain live-ins even if the first instruction in sched region is
+# DBG_.
+
+---
+name: sched
+tracksRegLiveness: true
+registers:
+- { id: 1, class: sgpr_32, preferred-register: '', flags: [ ] }
+- { id: 2, class: sgpr_32, preferred-register: '', flags: [ ] }
+body: |
+ bb.0.entry:
+ ; CHECK-LABEL: name: sched
+ ; CHECK: [[DEF:%[0-9]+]]:sgpr_32 = IMPLICIT_DEF
+ ; CHECK-NEXT: S_NOP 0
+ ; CHECK-NEXT: SCHED_BARRIER 0
+ ; CHECK-NEXT: DBG_VALUE
+ ; CHECK-NEXT: dead [[COPY:%[0-9]+]]:sgpr_32 = COPY [[DEF]]
+ ; CHECK-NEXT: S_NOP 0
+ ; CHECK-NEXT: S_ENDPGM 0
+ %1:sgpr_32 = IMPLICIT_DEF
+ S_NOP 0
+ SCHED_BARRIER 0
+ DBG_VALUE
+ dead %2:sgpr_32 = COPY %1
+ S_NOP 0
+ S_ENDPGM 0
+...
``````````
</details>
https://github.com/llvm/llvm-project/pull/131167
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