25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * CDDL HEADER START
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25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * You may not use this file except in compliance with the License.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Use is subject to license terms.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisln2_hi: .4byte 0xd1d00000, 0xb17217f7, 0x3ffe, 0x0
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisln2_lo: .4byte 0x4c67fc0d, 0x8654361c, 0xbfce, 0x0
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis andl $0x7fff,%ecx / ecx <-- zero_xtnd(bexp(x))
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis je .check_tail / |x| may be only slightly < ln(2)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis.general_case: / Here, |x| > ln(2) or x is NaN
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis cmpl $0x7fff,%ecx / bexp(|x|) = bexp(INF)?
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis jb .finite_non_special / if so, proceed with argument reduction
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis.finite_non_special: / -128 < x < -ln(2) || ln(2) < x < 2^14
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis fldt PIC_L(ln2_lo) / ln2_lo, x-[z]*ln2_hi, [z]
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis fmul %st(2),%st / [z]*ln2_lo, x-[z]*ln2_hi, [z]
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis movl 12(%rsp),%ecx / ecx <-- hi_32(sgnfcnd(x))
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis cmpl $0xd1cf79ab,%edx / Is |x| slightly < ln(2)?
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis ja .finite_non_special / branch if |x| slightly > ln(2)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis / Here, |x| < ln(2), so |z| = |x/ln(2)| < 1,
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis fldt 8(%rsp) / x
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis fldl2e / log2(e), x
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis fmulp / z := x*log2(e)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis f2xm1 / 2^(x*log2(e))-1 = e^x-1
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis movl 12(%rsp),%ecx / ecx <-- hi_32(sgnfcnd(x))
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis cmpl $0x80000000,%ecx / hi_32(|x|) = hi_32(INF)?
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis jne .NaN_or_pinf / if not, x is NaN
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis movl 8(%rsp),%edx / edx <-- lo_32(x)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis cmpl $0,%edx / lo_32(x) = 0?
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis jne .NaN_or_pinf / if not, x is NaN
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis movl 16(%rsp),%eax / ax <-- sign&bexp((x))
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis andl $0x8000,%eax / here, x is infinite, but +/-?
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis jz .NaN_or_pinf / branch if x = +INF
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis fld1 / Here, x = -inf, so return -1
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis / Here, x = NaN or +inf, so load x and return immediately.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis SET_SIZE(expm1l)