[TwoAddressInstruction] Pre-commit a test case for D110848

diff --git a/llvm/test/CodeGen/SystemZ/twoaddr-kill.mir b/llvm/test/CodeGen/SystemZ/twoaddr-kill.mir
new file mode 100644 (file)
index 0000000..290f277
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/twoaddr-kill.mir
@@ -0,0 +1,36 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -o - %s -verify-machineinstrs -mtriple=s390x-linux-gnu -mcpu=z196 -run-pass=livevars,twoaddressinstruction | FileCheck %s
+
+# FIXME: The COPY from [[COPY3]] is killed even though there is a subsequent use
+# of [[COPY3]] in the INLINEASM instruction.
+---
+name: f2
+tracksRegLiveness: true
+body: |
+  bb.0:
+    liveins: $r2l
+
+    ; CHECK-LABEL: name: f2
+    ; CHECK: liveins: $r2l
+    ; CHECK-NEXT: {{  $}}
+    ; CHECK-NEXT: [[COPY:%[0-9]+]]:gr32bit = COPY killed $r2l
+    ; CHECK-NEXT: [[COPY1:%[0-9]+]]:grh32bit = COPY [[COPY]]
+    ; CHECK-NEXT: $r2l = COPY [[COPY]]
+    ; CHECK-NEXT: $r3l = COPY killed [[COPY]]
+    ; CHECK-NEXT: [[COPY2:%[0-9]+]]:grh32bit = COPY killed [[COPY1]]
+    ; CHECK-NEXT: INLINEASM &"stepa $1, $2, $3", 0 /* attdialect */, 393226 /* regdef:GRH32Bit */, def [[COPY2]], 2147483657 /* reguse tiedto:$0 */, [[COPY2]](tied-def 3), 9 /* reguse */, killed $r2l, 9 /* reguse */, killed $r3l
+    ; CHECK-NEXT: [[COPY3:%[0-9]+]]:grh32bit = COPY killed [[COPY2]]
+    ; CHECK-NEXT: [[COPY4:%[0-9]+]]:grh32bit = COPY killed [[COPY3]]
+    ; CHECK-NEXT: INLINEASM &"stepb $1, $2", 0 /* attdialect */, 393227 /* regdef-ec:GRH32Bit */, def early-clobber [[COPY4]], 2147483657 /* reguse tiedto:$0 */, [[COPY4]](tied-def 3), 393225 /* reguse:GRH32Bit */, [[COPY3]]
+    ; CHECK-NEXT: $r2l = COPY killed [[COPY4]]
+    ; CHECK-NEXT: Return implicit killed $r2l
+    %0:gr32bit = COPY killed $r2l
+    %2:grh32bit = COPY %0
+    $r2l = COPY %0
+    $r3l = COPY killed %0
+    INLINEASM &"stepa $1, $2, $3", 0 /* attdialect */, 393226 /* regdef:GRH32Bit */, def %1:grh32bit, 2147483657 /* reguse tiedto:$0 */, killed %2(tied-def 3), 9 /* reguse */, killed $r2l, 9 /* reguse */, killed $r3l
+    %4:grh32bit = COPY killed %1
+    INLINEASM &"stepb $1, $2", 0 /* attdialect */, 393227 /* regdef-ec:GRH32Bit */, def early-clobber %3:grh32bit, 2147483657 /* reguse tiedto:$0 */, killed %4(tied-def 3), 393225 /* reguse:GRH32Bit */, %4
+    $r2l = COPY killed %3
+    Return implicit killed $r2l
+...