Handle lane masks in LivePhysRegs when adding live-ins

Differential Revision: https://reviews.llvm.org/D25533

llvm-svn: 284076

1 files changed, 40 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/Hexagon/livephysregs-lane-masks.mir b/llvm/test/CodeGen/Hexagon/livephysregs-lane-masks.mir
new file mode 100644
index 00000000000..b2e1968bb59
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/livephysregs-lane-masks.mir
@@ -0,0 +1,40 @@
+# RUN: llc -march=hexagon -run-pass if-converter -verify-machineinstrs -o - %s | FileCheck %s
+
+# CHECK-LABEL: name: foo
+# CHECK: %p0 = C2_cmpeqi %r16, 0
+# Make sure there is no implicit use of r1.
+# CHECK: %r1 = L2_ploadruhf_io %p0, %r29, 6
+
+--- |
+  define void @foo() {
+    ret void
+  }
+...
+
+
+---
+name: foo
+tracksRegLiveness: true
+
+body: |
+  bb.0:
+    liveins: %r16
+    successors: %bb.1, %bb.2
+        %p0 = C2_cmpeqi %r16, 0
+        J2_jumpt %p0, %bb.2, implicit-def %pc
+
+  bb.1:
+    ; The lane mask %d0:0002 is equivalent to %r0. LivePhysRegs would ignore
+    ; it and treat it as the whole %d0, which is a pair %r1, %r0. The extra
+    ; %r1 would cause an (undefined) implicit use to be added during
+    ; if-conversion.
+    liveins: %d0:0x00000002, %d15:0x00000001, %r16
+    successors: %bb.2
+        %r1 = L2_loadruh_io %r29, 6
+        S2_storeri_io killed %r16, 0, %r1
+
+  bb.2:
+    liveins: %r0
+        %d8 = L2_loadrd_io %r29, 8
+        L4_return implicit-def %r29, implicit-def %r30, implicit-def %r31, implicit-def %pc, implicit %r30
+