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| author | Vladimir Azarov <avm@intermediate-node.net> | 2024-10-01 15:47:05 +0200 |
|---|---|---|
| committer | Vladimir Azarov <avm@intermediate-node.net> | 2024-10-01 15:47:05 +0200 |
| commit | 4abab5ad6c8465a7528ccdd5f49367da05f78bbd (patch) | |
| tree | ebf009bf1376a5a223a915bc27cbbd791a1316bc /src/math/i386/acos.s | |
Initial version
Diffstat (limited to 'src/math/i386/acos.s')
| -rw-r--r-- | src/math/i386/acos.s | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/math/i386/acos.s b/src/math/i386/acos.s new file mode 100644 index 0000000..af423a2 --- /dev/null +++ b/src/math/i386/acos.s @@ -0,0 +1,18 @@ +# use acos(x) = atan2(fabs(sqrt((1-x)*(1+x))), x) + +.global acos +.type acos,@function +acos: + fldl 4(%esp) + fld %st(0) + fld1 + fsub %st(0),%st(1) + fadd %st(2) + fmulp + fsqrt + fabs # fix sign of zero (matters in downward rounding mode) + fxch %st(1) + fpatan + fstpl 4(%esp) + fldl 4(%esp) + ret |