[llvm] r320257 - [X86] Tag segment prefixes as NOP instruction scheduling classes

[Simon Pilgrim via llvm-commits]

Author: rksimon
Date: Sat Dec  9 08:58:34 2017
New Revision: 320257

URL: http://llvm.org/viewvc/llvm-project?rev=320257&view=rev
Log:
[X86] Tag segment prefixes as NOP instruction scheduling classes

Modified:
    llvm/trunk/lib/Target/X86/X86InstrSystem.td

Modified: llvm/trunk/lib/Target/X86/X86InstrSystem.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86InstrSystem.td?rev=320257&r1=320256&r2=320257&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86InstrSystem.td (original)
+++ llvm/trunk/lib/Target/X86/X86InstrSystem.td Sat Dec  9 08:58:34 2017
@@ -154,13 +154,14 @@ def MOV64cr : I<0x22, MRMSrcReg, (outs C
 //===----------------------------------------------------------------------===//
 // Segment override instruction prefixes
 
-def CS_PREFIX : I<0x2E, RawFrm, (outs), (ins), "cs", []>;
-def SS_PREFIX : I<0x36, RawFrm, (outs), (ins), "ss", []>;
-def DS_PREFIX : I<0x3E, RawFrm, (outs), (ins), "ds", []>;
-def ES_PREFIX : I<0x26, RawFrm, (outs), (ins), "es", []>;
-def FS_PREFIX : I<0x64, RawFrm, (outs), (ins), "fs", []>;
-def GS_PREFIX : I<0x65, RawFrm, (outs), (ins), "gs", []>;
-
+let SchedRW = [WriteNop] in {
+def CS_PREFIX : I<0x2E, RawFrm, (outs), (ins), "cs", [], IIC_NOP>;
+def SS_PREFIX : I<0x36, RawFrm, (outs), (ins), "ss", [], IIC_NOP>;
+def DS_PREFIX : I<0x3E, RawFrm, (outs), (ins), "ds", [], IIC_NOP>;
+def ES_PREFIX : I<0x26, RawFrm, (outs), (ins), "es", [], IIC_NOP>;
+def FS_PREFIX : I<0x64, RawFrm, (outs), (ins), "fs", [], IIC_NOP>;
+def GS_PREFIX : I<0x65, RawFrm, (outs), (ins), "gs", [], IIC_NOP>;
+} // SchedRW
 
 //===----------------------------------------------------------------------===//
 // Moves to and from segment registers.