From 1ff62e182e648c72e6fce4f9d7911f2edfd914d2 Mon Sep 17 00:00:00 2001
From: Richard Sandiford <rsandifo@linux.vnet.ibm.com>
Date: Tue, 1 Oct 2013 14:08:44 +0000
Subject: [PATCH] [SystemZ] Allow integer XOR involving high words

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191759 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/SystemZ/SystemZAsmPrinter.cpp   |  1 +
 lib/Target/SystemZ/SystemZISelLowering.cpp |  4 +--
 lib/Target/SystemZ/SystemZInstrInfo.cpp    |  4 +++
 lib/Target/SystemZ/SystemZInstrInfo.td     | 11 ++++--
 test/CodeGen/SystemZ/asm-18.ll             | 42 ++++++++++++++++++++++
 5 files changed, 57 insertions(+), 5 deletions(-)

diff --git a/lib/Target/SystemZ/SystemZAsmPrinter.cpp b/lib/Target/SystemZ/SystemZAsmPrinter.cpp
index 64ff46b9378..b256ac5f054 100644
--- a/lib/Target/SystemZ/SystemZAsmPrinter.cpp
+++ b/lib/Target/SystemZ/SystemZAsmPrinter.cpp
@@ -130,6 +130,7 @@ void SystemZAsmPrinter::EmitInstruction(const MachineInstr *MI) {
   LOWER_HIGH(OIHL);
   LOWER_HIGH(OIHH);
   LOWER_HIGH(OIHF);
+  LOWER_HIGH(XIHF);
 
 #undef LOWER_HIGH
 
diff --git a/lib/Target/SystemZ/SystemZISelLowering.cpp b/lib/Target/SystemZ/SystemZISelLowering.cpp
index 19020c82bff..4d3c22c6f19 100644
--- a/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -3011,8 +3011,8 @@ EmitInstrWithCustomInserter(MachineInstr *MI, MachineBasicBlock *MBB) const {
     return emitAtomicLoadBinary(MI, MBB, SystemZ::XGR, 64);
   case SystemZ::ATOMIC_LOAD_XILF64:
     return emitAtomicLoadBinary(MI, MBB, SystemZ::XILF64, 64);
-  case SystemZ::ATOMIC_LOAD_XIHF:
-    return emitAtomicLoadBinary(MI, MBB, SystemZ::XIHF, 64);
+  case SystemZ::ATOMIC_LOAD_XIHF64:
+    return emitAtomicLoadBinary(MI, MBB, SystemZ::XIHF64, 64);
 
   case SystemZ::ATOMIC_LOADW_NRi:
     return emitAtomicLoadBinary(MI, MBB, SystemZ::NR, 0, true);
diff --git a/lib/Target/SystemZ/SystemZInstrInfo.cpp b/lib/Target/SystemZ/SystemZInstrInfo.cpp
index 57054891247..8749f48edfe 100644
--- a/lib/Target/SystemZ/SystemZInstrInfo.cpp
+++ b/lib/Target/SystemZ/SystemZInstrInfo.cpp
@@ -901,6 +901,10 @@ SystemZInstrInfo::expandPostRAPseudo(MachineBasicBlock::iterator MI) const {
     expandRIPseudo(MI, SystemZ::OILH, SystemZ::OIHH, false);
     return true;
 
+  case SystemZ::XIFMux:
+    expandRIPseudo(MI, SystemZ::XILF, SystemZ::XIHF, false);
+    return true;
+
   case SystemZ::ADJDYNALLOC:
     splitAdjDynAlloc(MI);
     return true;
diff --git a/lib/Target/SystemZ/SystemZInstrInfo.td b/lib/Target/SystemZ/SystemZInstrInfo.td
index 4cdf128f19c..c468b886420 100644
--- a/lib/Target/SystemZ/SystemZInstrInfo.td
+++ b/lib/Target/SystemZ/SystemZInstrInfo.td
@@ -900,10 +900,15 @@ let Defs = [CC] in {
   // XORs of a 32-bit immediate, leaving other bits unaffected.
   // The CC result only reflects the 32-bit field, which means we can
   // use it as a zero indicator for i32 operations but not otherwise.
-  let CCValues = 0xC, CompareZeroCCMask = 0x8 in
+  let CCValues = 0xC, CompareZeroCCMask = 0x8 in {
+    // Expands to XILF or XIHF, depending on the choice of register.
+    def XIFMux : BinaryRIPseudo<xor, GRX32, uimm32>,
+                 Requires<[FeatureHighWord]>;
     def XILF : BinaryRIL<"xilf", 0xC07, xor, GR32, uimm32>;
+    def XIHF : BinaryRIL<"xihf", 0xC06, xor, GRH32, uimm32>;
+  }
   def XILF64 : BinaryAliasRIL<xor, GR64, imm64lf32>;
-  def XIHF : BinaryRIL<"xihf", 0xC06, xor, GR64, imm64hf32>;
+  def XIHF64 : BinaryAliasRIL<xor, GR64, imm64hf32>;
 
   // XORs of memory.
   let CCValues = 0xC, CompareZeroCCMask = 0x8 in {
@@ -1186,7 +1191,7 @@ def ATOMIC_LOAD_XR      : AtomicLoadBinaryReg32<atomic_load_xor_32>;
 def ATOMIC_LOAD_XILF    : AtomicLoadBinaryImm32<atomic_load_xor_32, uimm32>;
 def ATOMIC_LOAD_XGR     : AtomicLoadBinaryReg64<atomic_load_xor_64>;
 def ATOMIC_LOAD_XILF64  : AtomicLoadBinaryImm64<atomic_load_xor_64, imm64lf32>;
-def ATOMIC_LOAD_XIHF    : AtomicLoadBinaryImm64<atomic_load_xor_64, imm64hf32>;
+def ATOMIC_LOAD_XIHF64  : AtomicLoadBinaryImm64<atomic_load_xor_64, imm64hf32>;
 
 def ATOMIC_LOADW_NRi    : AtomicLoadWBinaryReg<z_atomic_loadw_nand>;
 def ATOMIC_LOADW_NILHi  : AtomicLoadWBinaryImm<z_atomic_loadw_nand,
diff --git a/test/CodeGen/SystemZ/asm-18.ll b/test/CodeGen/SystemZ/asm-18.ll
index 4d0547fd9ea..bec8deeb72d 100644
--- a/test/CodeGen/SystemZ/asm-18.ll
+++ b/test/CodeGen/SystemZ/asm-18.ll
@@ -395,3 +395,45 @@ define void @f18() {
   call void asm sideeffect "stepd $0", "r"(i32 %or3)
   ret void
 }
+
+; Test immediate XOR involving high registers.
+define void @f19() {
+; CHECK-LABEL: f19:
+; CHECK: stepa [[REG:%r[0-5]]]
+; CHECK: xihf [[REG]], 305397760
+; CHECK: stepb [[REG]]
+; CHECK: xihf [[REG]], 34661
+; CHECK: stepc [[REG]]
+; CHECK: xihf [[REG]], 12345678
+; CHECK: stepd [[REG]]
+; CHECK: br %r14
+  %res1 = call i32 asm "stepa $0", "=h"()
+  %xor1 = xor i32 %res1, 305397760
+  %res2 = call i32 asm "stepb $0, $1", "=h,h"(i32 %xor1)
+  %xor2 = xor i32 %res2, 34661
+  %res3 = call i32 asm "stepc $0, $1", "=h,h"(i32 %xor2)
+  %xor3 = xor i32 %res3, 12345678
+  call void asm sideeffect "stepd $0", "h"(i32 %xor3)
+  ret void
+}
+
+; Test immediate XOR involving low registers.
+define void @f20() {
+; CHECK-LABEL: f20:
+; CHECK: stepa [[REG:%r[0-5]]]
+; CHECK: xilf [[REG]], 305397760
+; CHECK: stepb [[REG]]
+; CHECK: xilf [[REG]], 34661
+; CHECK: stepc [[REG]]
+; CHECK: xilf [[REG]], 12345678
+; CHECK: stepd [[REG]]
+; CHECK: br %r14
+  %res1 = call i32 asm "stepa $0", "=r"()
+  %xor1 = xor i32 %res1, 305397760
+  %res2 = call i32 asm "stepb $0, $1", "=r,r"(i32 %xor1)
+  %xor2 = xor i32 %res2, 34661
+  %res3 = call i32 asm "stepc $0, $1", "=r,r"(i32 %xor2)
+  %xor3 = xor i32 %res3, 12345678
+  call void asm sideeffect "stepd $0", "r"(i32 %xor3)
+  ret void
+}
-- 
2.34.1