[SystemZ] Add sign-extending high-word loads (LBH and LHH)
llvm-svn: 191740
diff --git a/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp b/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
index 798fa33..a1c0c36 100644
--- a/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
@@ -806,6 +806,14 @@
splitMove(MI, SystemZ::STD);
return true;
+ case SystemZ::LBMux:
+ expandRXYPseudo(MI, SystemZ::LB, SystemZ::LBH);
+ return true;
+
+ case SystemZ::LHMux:
+ expandRXYPseudo(MI, SystemZ::LH, SystemZ::LHH);
+ return true;
+
case SystemZ::LMux:
expandRXYPseudo(MI, SystemZ::L, SystemZ::LFH);
return true;
diff --git a/llvm/lib/Target/SystemZ/SystemZInstrInfo.td b/llvm/lib/Target/SystemZ/SystemZInstrInfo.td
index 241cd333..6eeb91b 100644
--- a/llvm/lib/Target/SystemZ/SystemZInstrInfo.td
+++ b/llvm/lib/Target/SystemZ/SystemZInstrInfo.td
@@ -408,9 +408,21 @@
def : Pat<(sext_inreg GR64:$src, i32),
(LGFR (EXTRACT_SUBREG GR64:$src, subreg_l32))>;
-// 32-bit extensions from memory.
-def LB : UnaryRXY<"lb", 0xE376, asextloadi8, GR32, 1>;
+// 32-bit extensions from 8-bit memory. LBMux expands to LB or LBH,
+// depending on the choice of register.
+def LBMux : UnaryRXYPseudo<"lb", asextloadi8, GRX32, 1>,
+ Requires<[FeatureHighWord]>;
+def LB : UnaryRXY<"lb", 0xE376, asextloadi8, GR32, 1>;
+def LBH : UnaryRXY<"lbh", 0xE3C0, asextloadi8, GRH32, 1>,
+ Requires<[FeatureHighWord]>;
+
+// 32-bit extensions from 16-bit memory. LHMux expands to LH or LHH,
+// depending on the choice of register.
+def LHMux : UnaryRXYPseudo<"lh", asextloadi16, GRX32, 2>,
+ Requires<[FeatureHighWord]>;
defm LH : UnaryRXPair<"lh", 0x48, 0xE378, asextloadi16, GR32, 2>;
+def LHH : UnaryRXY<"lhh", 0xE3C4, asextloadi16, GRH32, 2>,
+ Requires<[FeatureHighWord]>;
def LHRL : UnaryRILPC<"lhrl", 0xC45, aligned_asextloadi16, GR32>;
// 64-bit extensions from memory.