Add definition of WSBH (Word Swap Bytes within Halfwords), which is an

instruction supported by mips32r2, and add a pattern which replaces bswap with
a ROTR and WSBH pair.

WSBW is removed since it is not an instruction the current architectures
support.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147015 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/Mips/Mips.td b/lib/Target/Mips/Mips.td
index e9e0f60566e9cb08af57a8919f1d0999130e3b97..ff1c434b0220cc926469fdeafe6921bd9cb167a2 100644 (file)
--- a/lib/Target/Mips/Mips.td
+++ b/lib/Target/Mips/Mips.td
@@ -63,7 +63,7 @@ def FeatureMips32      : SubtargetFeature<"mips32", "MipsArchVersion", "Mips32",
                                 [FeatureCondMov, FeatureBitCount]>;
 def FeatureMips32r2    : SubtargetFeature<"mips32r2", "MipsArchVersion",
                                 "Mips32r2", "Mips32r2 ISA Support",
-                                [FeatureMips32, FeatureSEInReg]>;
+                                [FeatureMips32, FeatureSEInReg, FeatureSwap]>;
 def FeatureMips64      : SubtargetFeature<"mips64", "MipsArchVersion",
                                 "Mips64", "Mips64 ISA Support",
                                 [FeatureGP64Bit, FeatureFP64Bit,

diff --git a/lib/Target/Mips/MipsInstrInfo.td b/lib/Target/Mips/MipsInstrInfo.td
index 8a39e69ab2ea0a4d76e964877159f7ab840ce28a..eb8b16b24bf26384d0e6bc5d1e42057049e4c16e 100644 (file)
--- a/lib/Target/Mips/MipsInstrInfo.td
+++ b/lib/Target/Mips/MipsInstrInfo.td
@@ -625,11 +625,10 @@ class SignExtInReg<bits<5> sa, string instr_asm, ValueType vt>:
   let Predicates = [HasSEInReg];
 }
 
-// Byte Swap
-class ByteSwap<bits<6> func, bits<5> sa, string instr_asm>:
-  FR<0x1f, func, (outs CPURegs:$rd), (ins CPURegs:$rt),
-     !strconcat(instr_asm, "\t$rd, $rt"),
-     [(set CPURegs:$rd, (bswap CPURegs:$rt))], NoItinerary> {
+// Subword Swap
+class SubwordSwap<bits<6> func, bits<5> sa, string instr_asm, RegisterClass RC>:
+  FR<0x1f, func, (outs RC:$rd), (ins RC:$rt),
+     !strconcat(instr_asm, "\t$rd, $rt"), [], NoItinerary> {
   let rs = 0;
   let shamt = sa;
   let Predicates = [HasSwap];
@@ -895,8 +894,8 @@ def SEH : SignExtInReg<0x18, "seh", i16>;
 def CLZ : CountLeading0<0x20, "clz", CPURegs>;
 def CLO : CountLeading1<0x21, "clo", CPURegs>;
 
-/// Byte Swap
-def WSBW : ByteSwap<0x20, 0x2, "wsbw">;
+/// Word Swap Bytes Within Halfwords
+def WSBH : SubwordSwap<0x20, 0x2, "wsbh", CPURegs>;
 
 /// No operation
 let addr=0 in
@@ -1104,6 +1103,9 @@ defm : SetgeImmPats<CPURegs, SLTi, SLTiu>;
 // select MipsDynAlloc
 def : Pat<(MipsDynAlloc addr:$f), (DynAlloc addr:$f)>;
 
+// bswap pattern
+def : Pat<(bswap CPURegs:$rt), (ROTR (WSBH CPURegs:$rt), 16)>; 
+
 //===----------------------------------------------------------------------===//
 // Floating Point Support
 //===----------------------------------------------------------------------===//