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remquo asm: return quotient mod 8, as intended by the spec

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this is a lot more efficient and also what is generally wanted.
perhaps the bit shuffling could be more efficient...
This commit is contained in:
Rich Felker
2012-03-19 23:53:52 -04:00
parent 804fbf0b8c
commit 7513d3ecab
1 changed files with 26 additions and 17 deletions
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43
src/math/i386/remquo.s
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@ -2,40 +2,49 @@
.type remquof,@function
remquof:
mov 12(%esp),%ecx
fldl 4(%esp)
fldl 8(%esp)
fldl 4(%esp)
mov 11(%esp),%dh
xor 7(%esp),%dh
jmp 1f
.global remquol
.type remquol,@function
remquol:
mov 28(%esp),%ecx
fldl 4(%esp)
fldl 16(%esp)
fldl 4(%esp)
mov 25(%esp),%dh
xor 13(%esp),%dh
jmp 1f
.global remquo
.type remquo,@function
remquo:
mov 20(%esp),%ecx
fldl 4(%esp)
fldl 12(%esp)
1: fld %st(1)
fldl 4(%esp)
mov 19(%esp),%dh
xor 11(%esp),%dh
1: fprem1
fnstsw %ax
sahf
jp 1b
fsubr %st(0),%st(2)
fxch %st(2)
fdivp
mov $0x4f000000,%eax
mov %eax,4(%esp)
flds 4(%esp)
fxch %st(1)
1: fprem
fnstsw %ax
sahf
jp 1b
fistpl (%ecx)
fstp %st(0)
fstp %st(1)
mov %ah,%dl
shr %dl
and $1,%dl
mov %ah,%al
shr $5,%al
and $2,%al
or %al,%dl
mov %ah,%al
shl $2,%al
and $4,%al
or %al,%dl
test %dh,%dh
jns 1f
neg %dl
1: movsbl %dl,%edx
mov %edx,(%ecx)
ret