From 2f0c31c0273b93196185a9d0dd260ee48e057c6d Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Thu, 6 Feb 2020 16:24:03 -0500
Subject: rename i386 exp.s to exp_ld.s

this commit is for the sake of reviewable history.
---
 src/math/i386/exp_ld.s | 146 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 src/math/i386/exp_ld.s

(limited to 'src/math/i386/exp_ld.s')

diff --git a/src/math/i386/exp_ld.s b/src/math/i386/exp_ld.s
new file mode 100644
index 00000000..df87c497
--- /dev/null
+++ b/src/math/i386/exp_ld.s
@@ -0,0 +1,146 @@
+.global expm1f
+.type expm1f,@function
+expm1f:
+	flds 4(%esp)
+	mov 4(%esp),%eax
+	add %eax,%eax
+	cmp $0x01000000,%eax
+	jae 1f
+		# subnormal x, return x with underflow
+	fld %st(0)
+	fmul %st(1)
+	fstps 4(%esp)
+	ret
+
+.global expm1l
+.type expm1l,@function
+expm1l:
+	fldt 4(%esp)
+	jmp 1f
+
+.global expm1
+.type expm1,@function
+expm1:
+	fldl 4(%esp)
+	mov 8(%esp),%eax
+	add %eax,%eax
+	cmp $0x00200000,%eax
+	jae 1f
+		# subnormal x, return x with underflow
+	fsts 4(%esp)
+	ret
+1:	fldl2e
+	fmulp
+	mov $0xc2820000,%eax
+	push %eax
+	flds (%esp)
+	pop %eax
+	fucomp %st(1)
+	fnstsw %ax
+	sahf
+	fld1
+	jb 1f
+		# x*log2e < -65, return -1 without underflow
+	fstp %st(1)
+	fchs
+	ret
+1:	fld %st(1)
+	fabs
+	fucom %st(1)
+	fnstsw %ax
+	fstp %st(0)
+	fstp %st(0)
+	sahf
+	ja 1f
+	f2xm1
+	ret
+1:	call 1f
+	fld1
+	fsubrp
+	ret
+
+.global exp2f
+.type exp2f,@function
+exp2f:
+	flds 4(%esp)
+	jmp 1f
+
+.global exp2l
+.global __exp2l
+.hidden __exp2l
+.type exp2l,@function
+exp2l:
+__exp2l:
+	fldt 4(%esp)
+	jmp 1f
+
+.global expf
+.type expf,@function
+expf:
+	flds 4(%esp)
+	jmp 2f
+
+.global exp
+.type exp,@function
+exp:
+	fldl 4(%esp)
+2:	fldl2e
+	fmulp
+	jmp 1f
+
+.global exp2
+.type exp2,@function
+exp2:
+	fldl 4(%esp)
+1:	sub $12,%esp
+	fld %st(0)
+	fstpt (%esp)
+	mov 8(%esp),%ax
+	and $0x7fff,%ax
+	cmp $0x3fff+13,%ax
+	jb 4f             # |x| < 8192
+	cmp $0x3fff+15,%ax
+	jae 3f            # |x| >= 32768
+	fsts (%esp)
+	cmpl $0xc67ff800,(%esp)
+	jb 2f             # x > -16382
+	movl $0x5f000000,(%esp)
+	flds (%esp)       # 0x1p63
+	fld %st(1)
+	fsub %st(1)
+	faddp
+	fucomp %st(1)
+	fnstsw
+	sahf
+	je 2f             # x - 0x1p63 + 0x1p63 == x
+	movl $1,(%esp)
+	flds (%esp)       # 0x1p-149
+	fdiv %st(1)
+	fstps (%esp)      # raise underflow
+2:	fld1
+	fld %st(1)
+	frndint
+	fxch %st(2)
+	fsub %st(2)       # st(0)=x-rint(x), st(1)=1, st(2)=rint(x)
+	f2xm1
+	faddp             # 2^(x-rint(x))
+1:	fscale
+	fstp %st(1)
+	add $12,%esp
+	ret
+3:	xor %eax,%eax
+4:	cmp $0x3fff-64,%ax
+	fld1
+	jb 1b             # |x| < 0x1p-64
+	fstpt (%esp)
+	fistl 8(%esp)
+	fildl 8(%esp)
+	fsubrp %st(1)
+	addl $0x3fff,8(%esp)
+	f2xm1
+	fld1
+	faddp             # 2^(x-rint(x))
+	fldt (%esp)       # 2^rint(x)
+	fmulp
+	add $12,%esp
+	ret
-- 
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