https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90491
--- Comment #2 from g.peterh...@t-online.de ---
example:
#include <array>
#include <iostream>
int main(const int argc, const char** argv)
{
using value_type = float;
using array_type = std::array<value_type, 16>;
array_type a;
for (size_t i=0; i<a.size(); ++i)
a[i] = argc + i;
for (size_t i=0; i<a.size(); ++i)
std::cout<<(a[i])<<' ';
return EXIT_SUCCESS;
}
compile with gcc-9 and -O3 -march=native (avx/avx2 available @ ryzen 2 !)
-mtune=intel -mno-vzeroupper
generates this code:
0000000000000000 <main>:
0: 55 push %rbp
1: 48 63 ff movslq %edi,%rdi
4: 53 push %rbx
5: 48 8d 64 24 a8 lea -0x58(%rsp),%rsp
a: 48 85 ff test %rdi,%rdi
d: 0f 88 b9 01 00 00 js 1cc <main+0x1cc>
13: c4 e1 fa 2a c7 vcvtsi2ss %rdi,%xmm0,%xmm0
18: c5 fa 11 44 24 10 vmovss %xmm0,0x10(%rsp)
1e: 48 89 f8 mov %rdi,%rax
21: 48 83 c0 01 add $0x1,%rax
25: 0f 88 2a 03 00 00 js 355 <main+0x355>
2b: c4 e1 fa 2a c0 vcvtsi2ss %rax,%xmm0,%xmm0
30: c5 fa 11 44 24 14 vmovss %xmm0,0x14(%rsp)
36: 48 89 f8 mov %rdi,%rax
39: 48 83 c0 02 add $0x2,%rax
3d: 0f 88 f8 02 00 00 js 33b <main+0x33b>
43: c4 e1 fa 2a c0 vcvtsi2ss %rax,%xmm0,%xmm0
48: c5 fa 11 44 24 18 vmovss %xmm0,0x18(%rsp)
4e: 48 89 f8 mov %rdi,%rax
51: 48 83 c0 03 add $0x3,%rax
55: 0f 88 c6 02 00 00 js 321 <main+0x321>
5b: c4 e1 fa 2a c0 vcvtsi2ss %rax,%xmm0,%xmm0
60: c5 fa 11 44 24 1c vmovss %xmm0,0x1c(%rsp)
66: 48 89 f8 mov %rdi,%rax
69: 48 83 c0 04 add $0x4,%rax
6d: 0f 88 94 02 00 00 js 307 <main+0x307>
73: c4 e1 fa 2a c0 vcvtsi2ss %rax,%xmm0,%xmm0
78: c5 fa 11 44 24 20 vmovss %xmm0,0x20(%rsp)
7e: 48 89 f8 mov %rdi,%rax
81: 48 83 c0 05 add $0x5,%rax
85: 0f 88 62 02 00 00 js 2ed <main+0x2ed>
8b: c4 e1 fa 2a c0 vcvtsi2ss %rax,%xmm0,%xmm0
90: c5 fa 11 44 24 24 vmovss %xmm0,0x24(%rsp)
96: 48 89 f8 mov %rdi,%rax
99: 48 83 c0 06 add $0x6,%rax
9d: 0f 88 30 02 00 00 js 2d3 <main+0x2d3>
a3: c4 e1 fa 2a c0 vcvtsi2ss %rax,%xmm0,%xmm0
a8: c5 fa 11 44 24 28 vmovss %xmm0,0x28(%rsp)
ae: 48 89 f8 mov %rdi,%rax
b1: 48 83 c0 07 add $0x7,%rax
b5: 0f 88 fe 01 00 00 js 2b9 <main+0x2b9>
bb: c4 e1 fa 2a c0 vcvtsi2ss %rax,%xmm0,%xmm0
c0: c5 fa 11 44 24 2c vmovss %xmm0,0x2c(%rsp)
c6: 48 89 f8 mov %rdi,%rax
c9: 48 83 c0 08 add $0x8,%rax
cd: 0f 88 cc 01 00 00 js 29f <main+0x29f>
d3: c4 e1 fa 2a c0 vcvtsi2ss %rax,%xmm0,%xmm0
d8: c5 fa 11 44 24 30 vmovss %xmm0,0x30(%rsp)
de: 48 89 f8 mov %rdi,%rax
e1: 48 83 c0 09 add $0x9,%rax
e5: 0f 88 9a 01 00 00 js 285 <main+0x285>
eb: c4 e1 fa 2a c0 vcvtsi2ss %rax,%xmm0,%xmm0
f0: c5 fa 11 44 24 34 vmovss %xmm0,0x34(%rsp)
f6: 48 89 f8 mov %rdi,%rax
f9: 48 83 c0 0a add $0xa,%rax
fd: 0f 88 68 01 00 00 js 26b <main+0x26b>
103: c4 e1 fa 2a c0 vcvtsi2ss %rax,%xmm0,%xmm0
108: c5 fa 11 44 24 38 vmovss %xmm0,0x38(%rsp)
10e: 48 89 f8 mov %rdi,%rax
111: 48 83 c0 0b add $0xb,%rax
115: 0f 88 36 01 00 00 js 251 <main+0x251>
11b: c4 e1 fa 2a c0 vcvtsi2ss %rax,%xmm0,%xmm0
120: c5 fa 11 44 24 3c vmovss %xmm0,0x3c(%rsp)
126: 48 89 f8 mov %rdi,%rax
129: 48 83 c0 0c add $0xc,%rax
12d: 0f 88 04 01 00 00 js 237 <main+0x237>
133: c4 e1 fa 2a c0 vcvtsi2ss %rax,%xmm0,%xmm0
138: c5 fa 11 44 24 40 vmovss %xmm0,0x40(%rsp)
13e: 48 89 f8 mov %rdi,%rax
141: 48 83 c0 0d add $0xd,%rax
145: 0f 88 d2 00 00 00 js 21d <main+0x21d>
14b: c4 e1 fa 2a c0 vcvtsi2ss %rax,%xmm0,%xmm0
150: c5 fa 11 44 24 44 vmovss %xmm0,0x44(%rsp)
156: 48 89 f8 mov %rdi,%rax
159: 48 83 c0 0e add $0xe,%rax
15d: 0f 88 a0 00 00 00 js 203 <main+0x203>
163: c4 e1 fa 2a c0 vcvtsi2ss %rax,%xmm0,%xmm0
168: c5 fa 11 44 24 48 vmovss %xmm0,0x48(%rsp)
16e: 48 83 c7 0f add $0xf,%rdi
172: 78 75 js 1e9 <main+0x1e9>
174: c4 e1 fa 2a c7 vcvtsi2ss %rdi,%xmm0,%xmm0
179: c5 fa 11 44 24 4c vmovss %xmm0,0x4c(%rsp)
17f: 48 8d 5c 24 10 lea 0x10(%rsp),%rbx
184: 48 8d 6c 24 50 lea 0x50(%rsp),%rbp
189: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)
190: c5 fa 10 03 vmovss (%rbx),%xmm0
194: bf 00 00 00 00 mov $0x0,%edi
195: R_X86_64_32 std::cout
199: c5 fa 5a c0 vcvtss2sd %xmm0,%xmm0,%xmm0
19d: 48 83 c3 04 add $0x4,%rbx
1a1: e8 00 00 00 00 callq 1a6 <main+0x1a6>
1a2: R_X86_64_PLT32 std::ostream&
std::ostream::_M_insert<double>(double)-0x4
1a6: 48 89 c7 mov %rax,%rdi
1a9: ba 01 00 00 00 mov $0x1,%edx
1ae: c6 44 24 0f 20 movb $0x20,0xf(%rsp)
1b3: 48 8d 74 24 0f lea 0xf(%rsp),%rsi
1b8: e8 00 00 00 00 callq 1bd <main+0x1bd>
1b9: R_X86_64_PLT32 std::basic_ostream<char,
std::char_traits<char> >& std::__ostream_insert<char, std::char_traits<char>
>(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)-0x4
1bd: 48 39 eb cmp %rbp,%rbx
1c0: 75 ce jne 190 <main+0x190>
1c2: 48 8d 64 24 58 lea 0x58(%rsp),%rsp
1c7: 31 c0 xor %eax,%eax
1c9: 5b pop %rbx
1ca: 5d pop %rbp
1cb: c3 retq
1cc: 48 89 f8 mov %rdi,%rax
1cf: 48 89 fa mov %rdi,%rdx
1d2: 48 d1 e8 shr %rax
1d5: 83 e2 01 and $0x1,%edx
1d8: 48 09 d0 or %rdx,%rax
1db: c4 e1 fa 2a c0 vcvtsi2ss %rax,%xmm0,%xmm0
1e0: c5 fa 58 c0 vaddss %xmm0,%xmm0,%xmm0
1e4: e9 2f fe ff ff jmpq 18 <main+0x18>
1e9: 48 89 f8 mov %rdi,%rax
1ec: 83 e7 01 and $0x1,%edi
1ef: 48 d1 e8 shr %rax
1f2: 48 09 f8 or %rdi,%rax
1f5: c4 e1 fa 2a c0 vcvtsi2ss %rax,%xmm0,%xmm0
1fa: c5 fa 58 c0 vaddss %xmm0,%xmm0,%xmm0
1fe: e9 76 ff ff ff jmpq 179 <main+0x179>
203: 48 89 c2 mov %rax,%rdx
206: 83 e0 01 and $0x1,%eax
209: 48 d1 ea shr %rdx
20c: 48 09 c2 or %rax,%rdx
20f: c4 e1 fa 2a c2 vcvtsi2ss %rdx,%xmm0,%xmm0
214: c5 fa 58 c0 vaddss %xmm0,%xmm0,%xmm0
218: e9 4b ff ff ff jmpq 168 <main+0x168>
21d: 48 89 c2 mov %rax,%rdx
220: 83 e0 01 and $0x1,%eax
223: 48 d1 ea shr %rdx
226: 48 09 c2 or %rax,%rdx
229: c4 e1 fa 2a c2 vcvtsi2ss %rdx,%xmm0,%xmm0
22e: c5 fa 58 c0 vaddss %xmm0,%xmm0,%xmm0
232: e9 19 ff ff ff jmpq 150 <main+0x150>
237: 48 89 c2 mov %rax,%rdx
23a: 83 e0 01 and $0x1,%eax
23d: 48 d1 ea shr %rdx
240: 48 09 c2 or %rax,%rdx
243: c4 e1 fa 2a c2 vcvtsi2ss %rdx,%xmm0,%xmm0
248: c5 fa 58 c0 vaddss %xmm0,%xmm0,%xmm0
24c: e9 e7 fe ff ff jmpq 138 <main+0x138>
251: 48 89 c2 mov %rax,%rdx
254: 83 e0 01 and $0x1,%eax
257: 48 d1 ea shr %rdx
25a: 48 09 c2 or %rax,%rdx
25d: c4 e1 fa 2a c2 vcvtsi2ss %rdx,%xmm0,%xmm0
262: c5 fa 58 c0 vaddss %xmm0,%xmm0,%xmm0
266: e9 b5 fe ff ff jmpq 120 <main+0x120>
26b: 48 89 c2 mov %rax,%rdx
26e: 83 e0 01 and $0x1,%eax
271: 48 d1 ea shr %rdx
274: 48 09 c2 or %rax,%rdx
277: c4 e1 fa 2a c2 vcvtsi2ss %rdx,%xmm0,%xmm0
27c: c5 fa 58 c0 vaddss %xmm0,%xmm0,%xmm0
280: e9 83 fe ff ff jmpq 108 <main+0x108>
285: 48 89 c2 mov %rax,%rdx
288: 83 e0 01 and $0x1,%eax
28b: 48 d1 ea shr %rdx
28e: 48 09 c2 or %rax,%rdx
291: c4 e1 fa 2a c2 vcvtsi2ss %rdx,%xmm0,%xmm0
296: c5 fa 58 c0 vaddss %xmm0,%xmm0,%xmm0
29a: e9 51 fe ff ff jmpq f0 <main+0xf0>
29f: 48 89 c2 mov %rax,%rdx
2a2: 83 e0 01 and $0x1,%eax
2a5: 48 d1 ea shr %rdx
2a8: 48 09 c2 or %rax,%rdx
2ab: c4 e1 fa 2a c2 vcvtsi2ss %rdx,%xmm0,%xmm0
2b0: c5 fa 58 c0 vaddss %xmm0,%xmm0,%xmm0
2b4: e9 1f fe ff ff jmpq d8 <main+0xd8>
2b9: 48 89 c2 mov %rax,%rdx
2bc: 83 e0 01 and $0x1,%eax
2bf: 48 d1 ea shr %rdx
2c2: 48 09 c2 or %rax,%rdx
2c5: c4 e1 fa 2a c2 vcvtsi2ss %rdx,%xmm0,%xmm0
2ca: c5 fa 58 c0 vaddss %xmm0,%xmm0,%xmm0
2ce: e9 ed fd ff ff jmpq c0 <main+0xc0>
2d3: 48 89 c2 mov %rax,%rdx
2d6: 83 e0 01 and $0x1,%eax
2d9: 48 d1 ea shr %rdx
2dc: 48 09 c2 or %rax,%rdx
2df: c4 e1 fa 2a c2 vcvtsi2ss %rdx,%xmm0,%xmm0
2e4: c5 fa 58 c0 vaddss %xmm0,%xmm0,%xmm0
2e8: e9 bb fd ff ff jmpq a8 <main+0xa8>
2ed: 48 89 c2 mov %rax,%rdx
2f0: 83 e0 01 and $0x1,%eax
2f3: 48 d1 ea shr %rdx
2f6: 48 09 c2 or %rax,%rdx
2f9: c4 e1 fa 2a c2 vcvtsi2ss %rdx,%xmm0,%xmm0
2fe: c5 fa 58 c0 vaddss %xmm0,%xmm0,%xmm0
302: e9 89 fd ff ff jmpq 90 <main+0x90>
307: 48 89 c2 mov %rax,%rdx
30a: 83 e0 01 and $0x1,%eax
30d: 48 d1 ea shr %rdx
310: 48 09 c2 or %rax,%rdx
313: c4 e1 fa 2a c2 vcvtsi2ss %rdx,%xmm0,%xmm0
318: c5 fa 58 c0 vaddss %xmm0,%xmm0,%xmm0
31c: e9 57 fd ff ff jmpq 78 <main+0x78>
321: 48 89 c2 mov %rax,%rdx
324: 83 e0 01 and $0x1,%eax
327: 48 d1 ea shr %rdx
32a: 48 09 c2 or %rax,%rdx
32d: c4 e1 fa 2a c2 vcvtsi2ss %rdx,%xmm0,%xmm0
332: c5 fa 58 c0 vaddss %xmm0,%xmm0,%xmm0
336: e9 25 fd ff ff jmpq 60 <main+0x60>
33b: 48 89 c2 mov %rax,%rdx
33e: 83 e0 01 and $0x1,%eax
341: 48 d1 ea shr %rdx
344: 48 09 c2 or %rax,%rdx
347: c4 e1 fa 2a c2 vcvtsi2ss %rdx,%xmm0,%xmm0
34c: c5 fa 58 c0 vaddss %xmm0,%xmm0,%xmm0
350: e9 f3 fc ff ff jmpq 48 <main+0x48>
355: 48 89 c2 mov %rax,%rdx
358: 83 e0 01 and $0x1,%eax
35b: 48 d1 ea shr %rdx
35e: 48 09 c2 or %rax,%rdx
361: c4 e1 fa 2a c2 vcvtsi2ss %rdx,%xmm0,%xmm0
366: c5 fa 58 c0 vaddss %xmm0,%xmm0,%xmm0
36a: e9 c1 fc ff ff jmpq 30 <main+0x30>
36f: 90 nop
