From: Julian Seward <jseward@acm.org>
Date: Fri, 26 Nov 2004 12:18:51 +0000 (+0000)
Subject: Implement "rep nop" (P4 pause).
X-Git-Tag: svn/VALGRIND_3_0_1^2~746
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=73835ad31358dffc23c344088ad53bfc8a24632d;p=thirdparty%2Fvalgrind.git

Implement "rep nop" (P4 pause).


git-svn-id: svn://svn.valgrind.org/vex/trunk@588
---

diff --git a/VEX/priv/guest-x86/toIR.c b/VEX/priv/guest-x86/toIR.c
index 763de574d9..ff33371692 100644
--- a/VEX/priv/guest-x86/toIR.c
+++ b/VEX/priv/guest-x86/toIR.c
@@ -8826,14 +8826,14 @@ static DisResult disInstr ( /*IN*/  Bool    resteerOK,
 //--       case 0xAF: 
 //--          dis_REP_op ( cb, CondZ, dis_SCAS, sz, eip_orig, eip, "repe scas" );
 //--          break;
-//--       
-//--       case 0x90:           /* REP NOP (PAUSE) */
-//--          /* a hint to the P4 re spin-wait loop */
-//--          DIP("rep nop (P4 pause)\n");
-//--          jmp_lit(cb, eip);
-//--          LAST_UINSTR(cb).jmpkind = JmpYield;
-//--          break;
-//-- 
+      
+      case 0x90:           /* REP NOP (PAUSE) */
+         /* a hint to the P4 re spin-wait loop */
+         DIP("rep nop (P4 pause)\n");
+         jmp_lit(Ijk_Yield, ((Addr32)guest_eip_bbstart)+delta);
+         whatNext = Dis_StopHere;
+         break;
+
 //--       case 0xC3:           /* REP RET */
 //--          /* AMD K7/K8-specific optimisation; faster than vanilla RET */
 //--          dis_ret(cb, 0);