gwj / at91sam9263 · Commits

Commit 3ee1b8550c6e0bb48df4614ed185964dc1a036d3

Authored by malc
1 parent bdadc0b5

Optimize 64 bit bswap 

Use rldimi instead of rldicr/or pair, saves us one instruction.
Suggested by Hollis Blanchard.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5404 c046a42c-6fe2-441c-8c8c-71466251a162
Inline Side-by-side
Showing 1 changed file with 5 additions and 5 deletions
tcg/ppc64/tcg-target.c
  View file @3ee1b85
... ... @@ -303,6 +303,7 @@ static int tcg_target_const_match (tcg_target_long val,
303 303  
304 304 #define RLDICL XO30( 0)
305 305 #define RLDICR XO30( 1)
  306 +#define RLDIMI XO30( 3)
306 307  
307 308 #define BCLR XO19( 16)
308 309 #define BCCTR XO19(528)
... ... @@ -691,11 +692,10 @@ static void tcg_out_qemu_ld (TCGContext *s, const TCGArg *args, int opc)
691 692 break;
692 693 case 3:
693 694 if (bswap) {
694   - tcg_out32 (s, LWBRX | RT (0) | RB (r0));
695   - tcg_out32 (s, ADDI | RT (r1) | RA (r0) | 4);
696   - tcg_out32 (s, LWBRX | RT (data_reg) | RB (r1));
697   - tcg_out_rld (s, RLDICR, data_reg, data_reg, 32, 31);
698   - tcg_out32 (s, OR | SAB (0, data_reg, data_reg));
  695 + tcg_out_movi32 (s, 0, 4);
  696 + tcg_out32 (s, LWBRX | RT (data_reg) | RB (r0));
  697 + tcg_out32 (s, LWBRX | RT ( r1) | RA (r0));
  698 + tcg_out_rld (s, RLDIMI, data_reg, r1, 32, 0);
699 699 }
700 700 else tcg_out32 (s, LD | RT (data_reg) | RA (r0));
701 701 break;
... ...