[SystemZ] Add truncating high-word stores (STCH and STHH)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191743 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 24 insertions, 4 deletions

diff --git a/lib/Target/SystemZ/SystemZInstrInfo.cpp b/lib/Target/SystemZ/SystemZInstrInfo.cpp
index 7cbb4f7..1992993 100644
--- a/lib/Target/SystemZ/SystemZInstrInfo.cpp
+++ b/lib/Target/SystemZ/SystemZInstrInfo.cpp
@@ -826,6 +826,14 @@ SystemZInstrInfo::expandPostRAPseudo(MachineBasicBlock::iterator MI) const {
     expandRXYPseudo(MI, SystemZ::L, SystemZ::LFH);
     return true;
 
+  case SystemZ::STCMux:
+    expandRXYPseudo(MI, SystemZ::STC, SystemZ::STCH);
+    return true;
+
+  case SystemZ::STHMux:
+    expandRXYPseudo(MI, SystemZ::STH, SystemZ::STHH);
+    return true;
+
   case SystemZ::STMux:
     expandRXYPseudo(MI, SystemZ::ST, SystemZ::STFH);
     return true;
diff --git a/lib/Target/SystemZ/SystemZInstrInfo.td b/lib/Target/SystemZ/SystemZInstrInfo.td
index 4b50747..ea1fb8e 100644
--- a/lib/Target/SystemZ/SystemZInstrInfo.td
+++ b/lib/Target/SystemZ/SystemZInstrInfo.td
@@ -488,10 +488,22 @@ def LLGFRL : UnaryRILPC<"llgfrl", 0xC4E, aligned_azextloadi32, GR64>;
 def : Pat<(i32 (trunc GR64:$src)),
           (EXTRACT_SUBREG GR64:$src, subreg_l32)>;
 
-// Truncations of 32-bit registers to memory.
-defm STC   : StoreRXPair<"stc", 0x42, 0xE372, truncstorei8,  GR32, 1>;
-defm STH   : StoreRXPair<"sth", 0x40, 0xE370, truncstorei16, GR32, 2>;
-def  STHRL : StoreRILPC<"sthrl", 0xC47, aligned_truncstorei16, GR32>;
+// Truncations of 32-bit registers to 8-bit memory.  STCMux expands to
+// STC, STCY or STCH, depending on the choice of register.
+def STCMux : StoreRXYPseudo<truncstorei8, GRX32, 1>,
+             Requires<[FeatureHighWord]>;
+defm STC : StoreRXPair<"stc", 0x42, 0xE372, truncstorei8, GR32, 1>;
+def STCH : StoreRXY<"stch", 0xE3C3, truncstorei8, GRH32, 1>,
+           Requires<[FeatureHighWord]>;
+
+// Truncations of 32-bit registers to 16-bit memory.  STHMux expands to
+// STH, STHY or STHH, depending on the choice of register.
+def STHMux : StoreRXYPseudo<truncstorei16, GRX32, 1>,
+             Requires<[FeatureHighWord]>;
+defm STH : StoreRXPair<"sth", 0x40, 0xE370, truncstorei16, GR32, 2>;
+def STHH : StoreRXY<"sthh", 0xE3C7, truncstorei16, GRH32, 2>,
+           Requires<[FeatureHighWord]>;
+def STHRL : StoreRILPC<"sthrl", 0xC47, aligned_truncstorei16, GR32>;
 
 // Truncations of 64-bit registers to memory.
 defm : StoreGR64Pair<STC, STCY, truncstorei8>;