if (MOP.isDef()) {
// Introduce DefRegs set to skip the redundant register.
DefRegs.insert(MOP.getReg());
- if (UseRegs.count(MOP.getReg()))
+ if (!MOP.isDead() && UseRegs.count(MOP.getReg()))
// Since the regiester is modeled as defined,
// it is not necessary to be put in use register set.
UseRegs.erase(MOP.getReg());
--- /dev/null
+# RUN: llc -mtriple=aarch64 -run-pass=machine-outliner -verify-machineinstrs %s -o - | FileCheck %s
+
+# The test checks whether the compiler updates the side effect of function @OUTLINED_FUNCTION_0 by adding the use of register x0.
+
+--- |
+ declare void @spam() local_unnamed_addr
+ define void @bax() optsize minsize noredzone { ret void }
+ define void @bay() optsize minsize noredzone { ret void }
+ define void @baz() optsize minsize noredzone { ret void }
+...
+---
+name: bax
+tracksRegLiveness: true
+body: |
+ bb.0:
+ liveins: $x0, $lr
+
+ $x1 = ADDXri $sp, 16, 0
+ BL @spam, csr_darwin_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit $x0, implicit killed $x1, implicit-def $sp, implicit-def dead $x0
+
+ RET_ReallyLR
+
+...
+---
+name: bay
+tracksRegLiveness: true
+body: |
+ bb.0:
+ liveins: $x0, $lr
+
+ $x1 = ADDXri $sp, 16, 0
+ BL @spam, csr_darwin_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit $x0, implicit killed $x1, implicit-def $sp, implicit-def dead $x0
+
+ RET_ReallyLR
+
+...
+---
+name: baz
+tracksRegLiveness: true
+body: |
+ bb.0:
+ liveins: $x0, $lr
+
+ $x1 = ADDXri $sp, 16, 0
+ BL @spam, csr_darwin_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit $x0, implicit killed $x1, implicit-def $sp, implicit-def dead $x0
+
+ RET_ReallyLR
+
+...
+
+# CHECK: BL @OUTLINED_FUNCTION_0, {{.*}}, implicit $x0