Mercurial > hg > CbC > CbC_gcc
annotate gcc/config/sh/divcost-analysis @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Fri, 12 Feb 2010 23:39:51 +0900 |
| parents | a06113de4d67 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 Analysis of cycle costs for SH4: |
| 2 | |
| 3 -> udiv_le128: 5 | |
| 4 -> udiv_ge64k: 6 | |
| 5 -> udiv udiv_25: 10 | |
| 6 -> pos_divisor: 3 | |
| 7 -> pos_result linear: 5 | |
| 8 -> pos_result - -: 5 | |
| 9 -> div_le128: 7 | |
| 10 -> div_ge64k: 9 | |
| 11 sdivsi3 -> udiv_25 13 | |
| 12 udiv25 -> div_ge64k_end: 15 | |
| 13 div_ge64k_end -> rts: 13 | |
| 14 div_le128 -> div_le128_2: 2, r1 latency 3 | |
| 15 udiv_le128 -> div_le128_2: 2, r1 latency 3 | |
| 16 (u)div_le128 -> div_by_1: 9 | |
| 17 (u)div_le128 -> rts: 17 | |
| 18 div_by_1(_neg) -> rts: 4 | |
| 19 div_ge64k -> div_r8: 2 | |
| 20 div_ge64k -> div_ge64k_2: 3 | |
| 21 udiv_ge64k -> udiv_r8: 3 | |
| 22 udiv_ge64k -> div_ge64k_2: 3 + LS | |
| 23 (u)div_ge64k -> div_ge64k_end: 13 | |
| 24 div_r8 -> div_r8_2: 2 | |
| 25 udiv_r8 -> div_r8_2: 2 + LS | |
| 26 (u)div_r8 -> rts: 21 | |
| 27 | |
| 28 -> - + neg_result: 5 | |
| 29 -> + - neg_result: 5 | |
| 30 -> div_le128_neg: 7 | |
| 31 -> div_ge64k_neg: 9 | |
| 32 -> div_r8_neg: 11 | |
| 33 -> <64k div_ge64k_neg_end: 28 | |
| 34 -> >=64k div_ge64k_neg_end: 22 | |
| 35 div_ge64k_neg_end ft -> rts: 14 | |
| 36 div_r8_neg_end -> rts: 4 | |
| 37 div_r8_neg -> div_r8_neg_end: 18 | |
| 38 div_le128_neg -> div_by_1_neg: 4 | |
| 39 div_le128_neg -> rts 18 | |
| 40 | |
| 41 sh4-200 absolute divisor range: | |
| 42 1 [2..128] [129..64K) [64K..|dividend|/256] >=64K,>|dividend/256| | |
| 43 udiv 18 22 38 32 30 | |
| 44 sdiv pos: 20 24 41 35 32 | |
| 45 sdiv neg: 15 25 42 36 33 | |
| 46 | |
| 47 sh4-300 absolute divisor range: | |
| 48 8 bit 16 bit 24 bit > 24 bit | |
| 49 udiv 15 35 28 25 | |
| 50 sdiv 14 36 34 31 | |
| 51 | |
| 52 | |
| 53 fp-based: | |
| 54 | |
| 55 unsigned: 42 + 3 + 3 (lingering ftrc latency + sts fpul,rx) at caller's site | |
| 56 signed: 33 + 3 + 3 (lingering ftrc latency + sts fpul,rx) at caller's site | |
| 57 | |
| 58 call-div1: divisor range: | |
| 59 [1..64K) >= 64K | |
| 60 unsigned: 63 58 | |
| 61 signed: 76 76 | |
| 62 | |
| 63 SFUNC_STATIC call overhead: | |
| 64 mov.l 0f,r1 | |
| 65 bsrf r1 | |
| 66 | |
| 67 SFUNC_GOT call overhead - current: | |
| 68 mov.l 0f,r1 | |
| 69 mova 0f,r0 | |
| 70 mov.l 1f,r2 | |
| 71 add r1,r0 | |
| 72 mov.l @(r0,r2),r0 | |
| 73 jmp @r0 | |
| 74 ; 3 cycles worse than SFUNC_STATIC | |
| 75 | |
| 76 SFUNC_GOT call overhead - improved assembler: | |
| 77 mov.l 0f,r1 | |
| 78 mova 0f,r0 | |
| 79 mov.l @(r0,r1),r0 | |
| 80 jmp @r0 | |
| 81 ; 2 cycles worse than SFUNC_STATIC | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
82 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
83 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
84 Copyright (C) 2006, 2007 Free Software Foundation, Inc. |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
85 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
86 Copying and distribution of this file, with or without modification, |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
87 are permitted in any medium without royalty provided the copyright |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
88 notice and this notice are preserved. |