[Hexagon] Make sure duplexed dealloc_returns are checked for double jumps

Patch by Colin LeMahieu.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301951 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/Hexagon/MCTargetDesc/HexagonShuffler.cpp b/lib/Target/Hexagon/MCTargetDesc/HexagonShuffler.cpp
index 4844862e6d11359c45b0fd1cfdf80cc0cd41e888..2a3af20b35f025e54eb70263448026f6c2856f0d 100644 (file)
--- a/lib/Target/Hexagon/MCTargetDesc/HexagonShuffler.cpp
+++ b/lib/Target/Hexagon/MCTargetDesc/HexagonShuffler.cpp
@@ -336,6 +336,14 @@ bool HexagonShuffler::check() {
         ++jumps;
         foundBranches.push_back(ISJ);
       }
+      if (HexagonMCInstrInfo::getDesc(MCII, Inst0).isReturn()) {
+        ++deallocs, ++jumps, ++jump1; // DEALLOC_RETURN is of type LD.
+        foundBranches.push_back(ISJ);
+      }
+      if (HexagonMCInstrInfo::getDesc(MCII, Inst1).isReturn()) {
+        ++deallocs, ++jumps, ++jump1; // DEALLOC_RETURN is of type LD.
+        foundBranches.push_back(ISJ);
+      }
       break;
     }
     }

diff --git a/test/MC/Hexagon/dealloc-return-jump.s b/test/MC/Hexagon/dealloc-return-jump.s
new file mode 100644 (file)
index 0000000..0d480be
--- /dev/null
+++ b/test/MC/Hexagon/dealloc-return-jump.s
@@ -0,0 +1,7 @@
+# RUN: not llvm-mc -arch=hexagon -mcpu=hexagonv62 -filetype=obj -o - %s
+# Check that a duplex involving dealloc_return is correctly checked
+# dealloc_return cannot be involved in a double jump packet
+
+{ r0=add(r0,#-1)
+  p0=cmp.eq(r0,r0); if (p0.new) jump:nt 0
+  if (p0) dealloc_return }