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use alternate formula for acos asm to avoid loss of precision

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This commit is contained in:
Rich Felker 2012-03-19 23:08:49 -04:00
commit 804fbf0b8c
1 changed files with 11 additions and 3 deletions
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14
src/math/i386/acos.s
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@ -14,11 +14,19 @@ acosl:
.type acos,@function .type acos,@function
acos: acos:
fldl 4(%esp) fldl 4(%esp)
1: fld %st(0) 1: fld1
fmul %st(0) fld %st(1)
fld1 fld1
fsubp %st(1) fsubp
fxch %st(2)
faddp
fdivp
fsqrt fsqrt
fld1
fxch %st(1) fxch %st(1)
fpatan fpatan
fld1
fld1
faddp
fmulp
ret ret