[PATCH] D111531: Fix minor deficiency in MachineSink.
Markus Lavin via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Nov 11 23:16:10 PST 2021
This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG4e94e25c9024: Fix minor deficiency in machine-sink. (authored by markus).
Changed prior to commit:
https://reviews.llvm.org/D111531?vs=378604&id=386740#toc
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D111531/new/
https://reviews.llvm.org/D111531
Files:
llvm/lib/CodeGen/MachineSink.cpp
llvm/test/CodeGen/RISCV/MachineSink-implicit-x0.mir
Index: llvm/test/CodeGen/RISCV/MachineSink-implicit-x0.mir
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/RISCV/MachineSink-implicit-x0.mir
@@ -0,0 +1,33 @@
+# RUN: llc -mtriple=riscv32 %s -run-pass=machine-sink -o - | FileCheck %s
+
+# Verify that sinking of '%20:gpr = LUI 1, implicit $x0' is not inhibited by
+# the implicit use of '$x0'.
+# Register '$x0' is a 'MRI->isConstantPhysReg()' on RISCV and such uses should
+# not inhibit sinking transformation even though they are livein to the block
+# they are to be sunk into (inhibit under such conditions should only happen
+# for defines).
+
+---
+name: f
+tracksRegLiveness: true
+body: |
+ ; CHECK-LABEL: bb.1:
+ ; CHECK-NEXT: successors: %bb.3(0x80000000)
+ ; CHECK-NEXT: liveins: $x0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: [[LUI:%[0-9]+]]:gpr = LUI 1, implicit $x0
+ bb.0:
+ liveins: $x10
+ %10:gpr = COPY $x10
+ %20:gpr = LUI 1, implicit $x0
+ BEQ %10, %10, %bb.2
+ PseudoBR %bb.1
+ bb.1:
+ liveins: $x0
+ %30:gpr = ADDI %20, 5
+ PseudoBR %bb.3
+ bb.2:
+ PseudoBR %bb.3
+ bb.3:
+ PseudoRET
+...
Index: llvm/lib/CodeGen/MachineSink.cpp
===================================================================
--- llvm/lib/CodeGen/MachineSink.cpp
+++ llvm/lib/CodeGen/MachineSink.cpp
@@ -1324,7 +1324,8 @@
// "zombie" define of that preg. E.g., EFLAGS. (<rdar://problem/8030636>)
for (unsigned I = 0, E = MI.getNumOperands(); I != E; ++I) {
const MachineOperand &MO = MI.getOperand(I);
- if (!MO.isReg()) continue;
+ if (!MO.isReg() || MO.isUse())
+ continue;
Register Reg = MO.getReg();
if (Reg == 0 || !Register::isPhysicalRegister(Reg))
continue;
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