From: Julian Seward <jseward@acm.org>
Date: Tue, 24 Aug 2004 01:16:01 +0000 (+0000)
Subject: Fast-case a couple more flag/thunk conditions.
X-Git-Tag: svn/VALGRIND_3_0_1^2~1134
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=7a8eea36b59414cee03e80b7c52ab8380c953bfb;p=thirdparty%2Fvalgrind.git

Fast-case a couple more flag/thunk conditions.


git-svn-id: svn://svn.valgrind.org/vex/trunk@200
---

diff --git a/VEX/priv/guest-x86/ghelpers.c b/VEX/priv/guest-x86/ghelpers.c
index 3199ff620c..c1a16ac07e 100644
--- a/VEX/priv/guest-x86/ghelpers.c
+++ b/VEX/priv/guest-x86/ghelpers.c
@@ -464,7 +464,7 @@ static UInt calculate_eflags_c ( UInt cc_op, UInt cc_src, UInt cc_dst )
    tab[cc_op][cond]++;
    n_calc_cond++;
 
-   if (0 == ((n_calc_all+n_calc_c) & 0xFF)) showCounts();
+   if (0 == ((n_calc_all+n_calc_c) & 0xFFFF)) showCounts();
 #  endif
 
    switch (cond) {
@@ -635,6 +635,11 @@ IRExpr* x86guest_spechelper ( Char* function_name,
          return unop(Iop_1Uto32,binop(Iop_CmpEQ32, cc_dst, mkU32(0)));
       }
 
+      if (isU32(cc_op, CC_OP_LOGICL) && isU32(cond, CondS)) {
+         /* long and/or/xor, then S --> test dst <s 0 */
+         return unop(Iop_1Uto32,binop(Iop_CmpLT32S, cc_dst, mkU32(0)));
+      }
+
       if (isU32(cc_op, CC_OP_LOGICL) && isU32(cond, CondLE)) {
          /* long and/or/xor, then LE
             This is pretty subtle.  LOGIC sets SF and ZF according to the
@@ -676,6 +681,11 @@ IRExpr* x86guest_spechelper ( Char* function_name,
          return unop(Iop_1Uto32,binop(Iop_CmpEQ32, cc_dst, mkU32(0)));
       }
 
+      if (isU32(cc_op, CC_OP_DECL) && isU32(cond, CondS)) {
+         /* dec L, then S --> compare DST <s 0 */
+         return unop(Iop_1Uto32,binop(Iop_CmpLT32S, cc_dst, mkU32(0)));
+      }
+
       return NULL;
    }