[SystemZ] Use CLST to implement strcmp
llvm-svn: 188544
diff --git a/llvm/lib/Target/SystemZ/SystemZInstrFormats.td b/llvm/lib/Target/SystemZ/SystemZInstrFormats.td
index 2d18e03..1f80c27 100644
--- a/llvm/lib/Target/SystemZ/SystemZInstrFormats.td
+++ b/llvm/lib/Target/SystemZ/SystemZInstrFormats.td
@@ -1405,3 +1405,23 @@
[(operator bdaddr12only:$dest, bdaddr12only:$src,
imm32len8:$length)]>;
}
+
+// Define an instruction that operates on two strings, both terminated
+// by the character in R0. The instruction processes a CPU-determinated
+// number of bytes at a time and sets CC to 3 if the instruction needs
+// to be repeated. Also define a pseudo instruction that represents
+// the full loop (the main instruction plus the branch on CC==3).
+multiclass StringRRE<string mnemonic, bits<16> opcode,
+ SDPatternOperator operator> {
+ def "" : InstRRE<opcode, (outs GR64:$R1, GR64:$R2),
+ (ins GR64:$R1src, GR64:$R2src),
+ mnemonic#"\t$R1, $R2", []> {
+ let Constraints = "$R1 = $R1src, $R2 = $R2src";
+ let DisableEncoding = "$R1src, $R2src";
+ }
+ let usesCustomInserter = 1 in
+ def Loop : Pseudo<(outs GR64:$end),
+ (ins GR64:$start1, GR64:$start2, GR32:$char),
+ [(set GR64:$end, (operator GR64:$start1, GR64:$start2,
+ GR32:$char))]>;
+}