aboutsummaryrefslogtreecommitdiff
path: root/tcg
diff options
context:
space:
mode:
authorRichard Henderson <rth@twiddle.net>2013-04-02 15:09:52 -0700
committerRichard Henderson <rth@twiddle.net>2013-04-15 20:09:53 +0200
commit6995a4a063d3ab3ceb21aad8c8a78f4cfc5e4140 (patch)
tree65d627810ba09d8dcbb796836b5e5048ba7a7f52 /tcg
parent991041a4eb8895390d816375021dccfd12c81752 (diff)
tcg-ppc64: Use MFOCRF instead of MFCR
It takes half the cycles to read one CR register instead of all 8. This is a backward compatible addition to the ISA, so chips prior to Power 2.00 spec will simply continue to read the entire CR register. Reviewed-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'tcg')
-rw-r--r--tcg/ppc64/tcg-target.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/tcg/ppc64/tcg-target.c b/tcg/ppc64/tcg-target.c
index 70cbb86938..c7800b0929 100644
--- a/tcg/ppc64/tcg-target.c
+++ b/tcg/ppc64/tcg-target.c
@@ -382,6 +382,7 @@ static int tcg_target_const_match (tcg_target_long val,
#define SRAWI XO31(824)
#define NEG XO31(104)
#define MFCR XO31( 19)
+#define MFOCRF (MFCR | (1u << 20))
#define NOR XO31(124)
#define CNTLZW XO31( 26)
#define CNTLZD XO31( 58)
@@ -430,6 +431,7 @@ static int tcg_target_const_match (tcg_target_long val,
#define ME(e) ((e)<<1)
#define BO(o) ((o)<<21)
#define MB64(b) ((b)<<5)
+#define FXM(b) (1 << (19 - (b)))
#define LK 1
@@ -1226,10 +1228,12 @@ static void tcg_out_setcond (TCGContext *s, TCGType type, TCGCond cond,
sh = 31;
crop = CRNOR | BT (7, CR_EQ) | BA (7, CR_GT) | BB (7, CR_GT);
crtest:
- tcg_out_cmp (s, cond, arg1, arg2, const_arg2, 7, type);
- if (crop) tcg_out32 (s, crop);
- tcg_out32 (s, MFCR | RT (0));
- tcg_out_rlw(s, RLWINM, arg0, 0, sh, 31, 31);
+ tcg_out_cmp(s, cond, arg1, arg2, const_arg2, 7, type);
+ if (crop) {
+ tcg_out32(s, crop);
+ }
+ tcg_out32(s, MFOCRF | RT(TCG_REG_R0) | FXM(7));
+ tcg_out_rlw(s, RLWINM, arg0, TCG_REG_R0, sh, 31, 31);
break;
default: