Remove redundant REX prefix on 64 bit register clear

dlang · Apr 22, 2015 · c81bdb9 · c81bdb9
1 parent 043221f
commit c81bdb9
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Showing 2 changed files with 0 additions and 8 deletions.
diff --git a/src/backend/cod1.c b/src/backend/cod1.c
@@ -659,8 +659,6 @@ code *loadea(elem *e,code *cs,unsigned op,unsigned reg,targ_size_t offset,
         }
         else if (reg == 6)                      // if DIV
         {   cd = genregs(cd,0x33,DX,DX);        // XOR DX,DX
-            if (I64 && sz == 8)
-                code_orrex(cd, REX_W);
         }
   }
 

diff --git a/src/backend/cod3.c b/src/backend/cod3.c
@@ -2648,8 +2648,6 @@ code *movregconst(code *c,unsigned reg,targ_size_t value,regm_t flags)
             switch (value)
             {   case 0:
                     c = genclrreg(c,reg);
-                    if (flags & 64)
-                        code_orrex(c, REX_W);
                     break;
                 case 1:
                     if (I64)
@@ -2713,8 +2711,6 @@ code *movregconst(code *c,unsigned reg,targ_size_t value,regm_t flags)
             }
             if (value == 0 && !(flags & 8) && config.target_cpu >= TARGET_80486)
             {   c = genclrreg(c,reg);           // CLR reg
-                if (flags & 64)
-                    code_orrex(c, REX_W);
                 goto done;
             }
 
@@ -2751,8 +2747,6 @@ code *movregconst(code *c,unsigned reg,targ_size_t value,regm_t flags)
 
             if (value == 0 && !(flags & 8))
             {   c = genclrreg(c,reg);           // CLR reg
-                if (flags & 64)
-                    code_orrex(c, REX_W);
             }
             else
             {   /* See if we can just load a byte       */