Hello Kugah, Thanks a lot for your support. I attached source code and corresponding assembly codes which was generated by using gcc-4.8 and gcc-5.1. The compiler flags is "-O3".
Best Regards Ron -----Original Message----- From: Kugan [mailto:kugan.vivekanandara...@linaro.org] Sent: Tuesday, January 05, 2016 6:51 PM To: Xiaofeng Ren <xiaofeng....@nxp.com>; Bernie Ogden <bernie.og...@linaro.org> Cc: linaro-toolchain@lists.linaro.org Subject: Re: gcc-linaro-5.1 vs gcc-linaro-4.8 Hi Ron, > > Following part of assembly code for fcp function: > > Gcc-5.1: > 40110c: 3dc00c6c ldr q12, [x3,#48] > 401110: 3dc0106b ldr q11, [x3,#64] > 401114: 3dc0146a ldr q10, [x3,#80] > 401118: 3dc01869 ldr q9, [x3,#96] > 40111c: 3dc01c68 ldr q8, [x3,#112] > 401120: 3dc0207f ldr q31, [x3,#128] > 401124: 3dc0247e ldr q30, [x3,#144] > 401128: 3dc0287d ldr q29, [x3,#160] > 40112c: 3dc02c7c ldr q28, [x3,#176] > 401130: 3dc0307b ldr q27, [x3,#192] > 401134: 3dc0347a ldr q26, [x3,#208] > 401138: 3dc03879 ldr q25, [x3,#224] > 40113c: 3dc03c78 ldr q24, [x3,#240] > 401140: 3dc04077 ldr q23, [x3,#256] > 401144: 3dc04476 ldr q22, [x3,#272] > 401148: 3dc04875 ldr q21, [x3,#288] > 40114c: 3dc04c74 ldr q20, [x3,#304] > 401150: 3dc05073 ldr q19, [x3,#320] > 401154: 3dc05472 ldr q18, [x3,#336] > 401158: 3dc05871 ldr q17, [x3,#352] > 40115c: 3dc05c70 ldr q16, [x3,#368] > 401160: 3dc06067 ldr q7, [x3,#384] > 401164: 3dc06466 ldr q6, [x3,#400] > 401168: 3dc06865 ldr q5, [x3,#416] > 40116c: 3dc06c64 ldr q4, [x3,#432] > 401170: 3dc07063 ldr q3, [x3,#448] > 401174: 3dc07462 ldr q2, [x3,#464] > 401178: 3dc07861 ldr q1, [x3,#480] > 40117c: 3dc07c60 ldr q0, [x3,#496] > 401180: 3dc0006f ldr q15, [x3] > 401184: 91080063 add x3, x3, #0x200 > > Gcc-4.8: > 40135c: 4cdf78af ld1 {v15.4s}, [x5], #16 > 401360: 4c40790d ld1 {v13.4s}, [x8] > 401364: 4c4078ae ld1 {v14.4s}, [x5] > 401368: 9100c048 add x8, x2, #0x30 > 40136c: 91010045 add x5, x2, #0x40 > 401370: 4c40790c ld1 {v12.4s}, [x8] > 401374: 4c4078ab ld1 {v11.4s}, [x5] > 401378: 91014048 add x8, x2, #0x50 > 40137c: 91018045 add x5, x2, #0x60 > 401380: 4c40790a ld1 {v10.4s}, [x8] > 401384: 4c4078a9 ld1 {v9.4s}, [x5] > 401388: 9101c048 add x8, x2, #0x70 > 40138c: 91020045 add x5, x2, #0x80 > 401390: 4c407908 ld1 {v8.4s}, [x8] > 401394: 4c4078bf ld1 {v31.4s}, [x5] > 401398: 91024048 add x8, x2, #0x90 > 40139c: 91028045 add x5, x2, #0xa0 > 4013a0: 4c40791e ld1 {v30.4s}, [x8] > 4013a4: 4c4078bd ld1 {v29.4s}, [x5] > 4013a8: 9102c048 add x8, x2, #0xb0 > 4013ac: 91030045 add x5, x2, #0xc0 > Is it possible to create a compilable testcase with "fcp" so that we can reproduce the above? It need not be an executable test-case. Thanks, Kugah
fcp_gcc51_O3.s
Description: fcp_gcc51_O3.s
#define TYPE int
typedef struct _state {
double overhead;
int nbytes;
int need_buf2;
int aligned;
TYPE *buf;
TYPE *buf2;
TYPE *buf2_orig;
TYPE *lastone;
int N;
} state_t;
void
fcp(int iterations, void *cookie)
{
state_t *state = (state_t *) cookie;
register TYPE *lastone = state->lastone;
while (iterations-- > 0) {
register char *p = state->buf;
register TYPE *dst = state->buf2;
while (p <= lastone) {
#define DOIT(i) dst[i]=p[i];
DOIT(0) DOIT(1) DOIT(2) DOIT(3) DOIT(4) DOIT(5) DOIT(6)
DOIT(7) DOIT(8) DOIT(9) DOIT(10) DOIT(11) DOIT(12)
DOIT(13) DOIT(14) DOIT(15) DOIT(16) DOIT(17) DOIT(18)
DOIT(19) DOIT(20) DOIT(21) DOIT(22) DOIT(23) DOIT(24)
DOIT(25) DOIT(26) DOIT(27) DOIT(28) DOIT(29) DOIT(30)
DOIT(31) DOIT(32) DOIT(33) DOIT(34) DOIT(35) DOIT(36)
DOIT(37) DOIT(38) DOIT(39) DOIT(40) DOIT(41) DOIT(42)
DOIT(43) DOIT(44) DOIT(45) DOIT(46) DOIT(47) DOIT(48)
DOIT(49) DOIT(50) DOIT(51) DOIT(52) DOIT(53) DOIT(54)
DOIT(55) DOIT(56) DOIT(57) DOIT(58) DOIT(59) DOIT(60)
DOIT(61) DOIT(62) DOIT(63) DOIT(64) DOIT(65) DOIT(66)
DOIT(67) DOIT(68) DOIT(69) DOIT(70) DOIT(71) DOIT(72)
DOIT(73) DOIT(74) DOIT(75) DOIT(76) DOIT(77) DOIT(78)
DOIT(79) DOIT(80) DOIT(81) DOIT(82) DOIT(83) DOIT(84)
DOIT(85) DOIT(86) DOIT(87) DOIT(88) DOIT(89) DOIT(90)
DOIT(91) DOIT(92) DOIT(93) DOIT(94) DOIT(95) DOIT(96)
DOIT(97) DOIT(98) DOIT(99) DOIT(100) DOIT(101) DOIT(102)
DOIT(103) DOIT(104) DOIT(105) DOIT(106) DOIT(107)
DOIT(108) DOIT(109) DOIT(110) DOIT(111) DOIT(112)
DOIT(113) DOIT(114) DOIT(115) DOIT(116) DOIT(117)
DOIT(118) DOIT(119) DOIT(120) DOIT(121) DOIT(122)
DOIT(123) DOIT(124) DOIT(125) DOIT(126) DOIT(127)
p += 128;
dst += 128;
}
}
}
fcp_gcc48_O3.s
Description: fcp_gcc48_O3.s
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