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authornaruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2016-02-05 06:52:41 +0000
committernaruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2016-02-05 06:52:41 +0000
commit016e6db57e2fb9a8623493399efe2089b2870813 (patch)
tree4b435e5e9d033289ef7fa2bfdc29a6085e107259 /insns.def
parenteecfa1fc7a9156a42cf937f08719117bf398b3a0 (diff)
improve r53741
* Remove branching by a==0 case Before r53741: % perf stat ./miniruby -e'a=100;i=0;while i<0xfffffff;i+=1;a=(a*557+2)%100000;end' Performance counter stats for './miniruby -vea=100;i=0;while i<0xfffffff;i+=1;a=(a*557+2)%100000;end': 16412.994492 task-clock (msec) # 0.999 CPUs utilized 195 context-switches # 0.012 K/sec 2 cpu-migrations # 0.000 K/sec 876 page-faults # 0.053 K/sec 48488588328 cycles # 2.954 GHz 18464835712 stalled-cycles-frontend # 38.08% frontend cycles idle <not supported> stalled-cycles-backend 85665428518 instructions # 1.77 insns per cycle # 0.22 stalled cycles # per insn 10207419707 branches # 621.911 M/sec 6334713 branch-misses # 0.06% of all branches 16.426858699 seconds time elapsed After this: % perf stat ./miniruby -ve'a=100;i=0;while i<0xfffffff;i+=1;a=(a*557+2)%100000;end' Performance counter stats for './miniruby -vea=100;i=0;while i<0xfffffff;i+=1;a=(a*557+2)%100000;end': 13363.540634 task-clock (msec) # 0.999 CPUs utilized 137 context-switches # 0.010 K/sec 2 cpu-migrations # 0.000 K/sec 874 page-faults # 0.065 K/sec 39477429278 cycles # 2.954 GHz 14615402375 stalled-cycles-frontend # 37.02% frontend cycles idle <not supported> stalled-cycles-backend 83514678452 instructions # 2.12 insns per cycle # 0.18 stalled cycles per insn 9401528135 branches # 703.521 M/sec 432567 branch-misses # 0.00% of all branches 13.371484310 seconds time elapsed git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53744 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'insns.def')
-rw-r--r--insns.def27
1 files changed, 11 insertions, 16 deletions
diff --git a/insns.def b/insns.def
index 72ce1d998f..506bbe21a7 100644
--- a/insns.def
+++ b/insns.def
@@ -1431,29 +1431,24 @@ opt_mult
if (FIXNUM_2_P(recv, obj) &&
BASIC_OP_UNREDEFINED_P(BOP_MULT, FIXNUM_REDEFINED_OP_FLAG)) {
long a = FIX2LONG(recv);
- if (a == 0) {
- val = recv;
- }
- else {
#ifdef HAVE_INT128_T
- VALUE rb_int128t2big(int128_t n);
- int128_t r = (int128_t)a * FIX2LONG(obj);
- if (RB_FIXABLE(r)) {
+ VALUE rb_int128t2big(int128_t n);
+ int128_t r = (int128_t)a * (int128_t)FIX2LONG(obj);
+ if (RB_FIXABLE(r)) {
val = LONG2FIX((long)r);
- }
- else {
+ }
+ else {
val = rb_int128t2big(r);
- }
+ }
#else
- long b = FIX2LONG(obj);
- if (MUL_OVERFLOW_FIXNUM_P(a, b)) {
+ long b = FIX2LONG(obj);
+ if (MUL_OVERFLOW_FIXNUM_P(a, b)) {
val = rb_big_mul(rb_int2big(a), rb_int2big(b));
- }
- else {
+ }
+ else {
val = LONG2FIX(a * b);
- }
-#endif
}
+#endif
}
else if (FLONUM_2_P(recv, obj) &&
BASIC_OP_UNREDEFINED_P(BOP_MULT, FLOAT_REDEFINED_OP_FLAG)) {