[Valgrind-developers] vex: r1122 - trunk/priv/host-x86

[<sv...@va...>]

Author: sewardj
Date: 2005-04-06 02:11:53 +0100 (Wed, 06 Apr 2005)
New Revision: 1122

Modified:
   trunk/priv/host-x86/isel.c
Log:
iselIntExpr64(const): save a precious register in the case where
the two halves have the same value.


Modified: trunk/priv/host-x86/isel.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- trunk/priv/host-x86/isel.c	2005-04-06 01:11:08 UTC (rev 1121)
+++ trunk/priv/host-x86/isel.c	2005-04-06 01:11:53 UTC (rev 1122)
@@ -1691,10 +1691,17 @@
       HReg  tLo =3D newVRegI(env);
       HReg  tHi =3D newVRegI(env);
       vassert(e->Iex.Const.con->tag =3D=3D Ico_U64);
-      addInstr(env, X86Instr_Alu32R(Xalu_MOV, X86RMI_Imm(wHi), tHi));
-      addInstr(env, X86Instr_Alu32R(Xalu_MOV, X86RMI_Imm(wLo), tLo));
-      *rHi =3D tHi;
-      *rLo =3D tLo;
+      if (wLo =3D=3D wHi) {
+         /* Save a precious Int register in this special case. */
+         addInstr(env, X86Instr_Alu32R(Xalu_MOV, X86RMI_Imm(wLo), tLo));
+         *rHi =3D tLo;
+         *rLo =3D tLo;
+      } else {
+         addInstr(env, X86Instr_Alu32R(Xalu_MOV, X86RMI_Imm(wHi), tHi));
+         addInstr(env, X86Instr_Alu32R(Xalu_MOV, X86RMI_Imm(wLo), tLo));
+         *rHi =3D tHi;
+         *rLo =3D tLo;
+      }
       return;
    }
=20