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- TEXT asin(SB), $0
- FMOVD a+0(FP), F0 /* a */
- FMOVD F0, F0 /* a,a */
- FMULD F0, F0 /* a*a,a */
- FLD1 /* 1,a*a,a */
- FSUBRDP F0, F1 /* 1-a*a,a */
- FTST
- WAIT
- FSTSW AX
- SAHF
- JLO bad
- FSQRT /* sqrt(1-a*a),a */
- FPATAN /* atan2(sqrt(1-a*a),a) */
- RET
- TEXT acos(SB), $0
- FMOVD a+0(FP), F0
- FMOVD F0, F0
- FMULD F0, F0
- FLD1
- FSUBRDP F0, F1
- FTST
- WAIT
- FSTSW AX
- SAHF
- JLO bad
- FSQRT
- FXCHD F0, F1 /* identical except this */
- FPATAN
- RET
- bad:
- FMOVDP F0, F0
- FMOVDP F0, F0
- CALL NaN(SB)
- RET
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