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-rw-r--r--src/math/i386/acosf.s17
1 files changed, 16 insertions, 1 deletions
diff --git a/src/math/i386/acosf.s b/src/math/i386/acosf.s
index 6c95509f..d2cdfdbf 100644
--- a/src/math/i386/acosf.s
+++ b/src/math/i386/acosf.s
@@ -1 +1,16 @@
-# see acos.s
+.global acosf
+.type acosf,@function
+acosf:
+	flds 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
+	fstps 4(%esp)
+	flds 4(%esp)
+	ret