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| author | naruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2016-03-14 10:14:48 +0000 |
|---|---|---|
| committer | naruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2016-03-14 10:14:48 +0000 |
| commit | 3d5a3a236d99e7512955947be832b343b18b024c (patch) | |
| tree | e8fcfe451d3ddae98729599c399ae027da4dadf9 /vm_exec.h | |
| parent | 4b15b54d680bbb6e97673e67085ed4f70b612ccb (diff) | |
| download | ruby-3d5a3a236d99e7512955947be832b343b18b024c.tar.gz | |
* bignum.c (big2str_2bdigits): reduce div instruction.
Fix the code so that C compiler unify div instructions of `%` and `/`.
Before:
4291b0: 48 89 f0 mov %rsi,%rax
4291b3: 31 d2 xor %edx,%edx
4291b5: 48 83 ef 01 sub $0x1,%rdi
4291b9: 48 f7 f1 div %rcx # <---- !
4291bc: 41 0f b6 04 11 movzbl (%r9,%rdx,1),%eax
4291c1: 31 d2 xor %edx,%edx
4291c3: 41 88 04 38 mov %al,(%r8,%rdi,1)
4291c7: 48 63 4b 04 movslq 0x4(%rbx),%rcx
4291cb: 48 89 f0 mov %rsi,%rax
4291ce: 48 f7 f1 div %rcx # <---- !
4291d1: 48 89 c6 mov %rax,%rsi
4291d4: 48 85 ff test %rdi,%rdi
4291d7: 75 d7 jne 4291b0 <big2str_2bdigits+0x50>
4291d9: 48 63 6b 10 movslq 0x10(%rbx),%rbp
4291dd: 48 01 6b 20 add %rbp,0x20(%rbx)
4291e1: 48 8b 44 24 48 mov 0x48(%rsp),%rax
4291e6: 64 48 33 04 25 28 00 xor %fs:0x28,%rax
After:
4291b0: 48 63 73 04 movslq 0x4(%rbx),%rsi
4291b4: 31 d2 xor %edx,%edx
4291b6: 48 83 e9 01 sub $0x1,%rcx
4291ba: 48 f7 f6 div %rsi # <---- !
4291bd: 41 0f b6 14 10 movzbl (%r8,%rdx,1),%edx
4291c2: 88 14 0f mov %dl,(%rdi,%rcx,1)
4291c5: 48 85 c9 test %rcx,%rcx
4291c8: 75 e6 jne 4291b0 <big2str_2bdigits+0x50>
4291ca: 48 63 6b 10 movslq 0x10(%rbx),%rbp
4291ce: 48 01 6b 20 add %rbp,0x20(%rbx)
4291d2: 48 8b 44 24 48 mov 0x48(%rsp),%rax
4291d7: 64 48 33 04 25 28 00 xor %fs:0x28,%rax
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54102 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'vm_exec.h')
0 files changed, 0 insertions, 0 deletions