diff options
Diffstat (limited to 'sysdeps/ia64/fpu/s_ilogbl.S')
| -rw-r--r-- | sysdeps/ia64/fpu/s_ilogbl.S | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/sysdeps/ia64/fpu/s_ilogbl.S b/sysdeps/ia64/fpu/s_ilogbl.S new file mode 100644 index 0000000000..4c67d49fe3 --- /dev/null +++ b/sysdeps/ia64/fpu/s_ilogbl.S @@ -0,0 +1,240 @@ +.file "ilogbl.s" + +// Copyright (c) 2000, 2001, Intel Corporation +// All rights reserved. +// +// Contributed 2/2/2000 by John Harrison, Ted Kubaska, Bob Norin, Shane Story, +// and Ping Tak Peter Tang of the Computational Software Lab, Intel Corporation. +// +// WARRANTY DISCLAIMER +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTEL OR ITS +// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, +// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, +// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR +// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY +// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY OR TORT (INCLUDING +// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +// +// Intel Corporation is the author of this code, and requests that all +// problem reports or change requests be submitted to it directly at +// http://developer.intel.com/opensource. +// +// History +//============================================================== +// 2/03/00 Initial version +// 5/26/00 Fix bug when x a double-extended denormal; +// if x=0 call error routine, per C9X +// 8/15/00 Bundle added after call to __libm_error_support to properly +// set [the previously overwritten] GR_Parameter_RESULT. +// 1/20/01 Fixed result for x=0 + +.align 32 +.global ilogbl# + +.section .text +.proc ilogbl# +.align 32 + +// API +//============================================================== +// int = ilogbl(double_extended) + +// Overview of operation +//============================================================== +// ilogbl computes log2(x) as an int +// and returns it in r8 + +// ilogbl is similar to logbl but differs in the following ways: +// +-inf +// ilogbl: returns INT_MAX +// logbl: returns +inf +// Nan returns FP_ILOGBNAN (which is either INT_MAX or INT_MIN) +// ilogbl: returns INT_MAX (7fffffff) +// logbl: returns QNAN (quieted SNAN) +// 0 returns FP_ILOGB0 (which is either INT_MIN or -INT_MAX) +// ilogbl: returns INT_MIN (80000000) +// logbl: returns -inf + +// Registers used +//============================================================== + +// general local registers: +// ar.pfs r32 +// r33 -> r37 +// r38 -> r41 used as parameters to error path + +// predicate registers used: +// p6 - x nan, inf +// p7 - x 0 +// p8 - x norm, unorm +// p9 - x unorm + +// floating-point registers used: +// f8 - f10 + +#include "libm_support.h" + +GR_SAVE_PFS = r32 +GR_SAVE_B0 = r34 +GR_SAVE_GP = r35 +GR_Parameter_X = r38 +GR_Parameter_Y = r39 +GR_Parameter_RESULT = r40 +GR_Parameter_TAG = r41 + +FR_X = f8 +FR_Y = f0 +FR_RESULT = f0 + + +ilogbl: + +// Form signexp of 2^64 in case need to scale denormal +{ .mmf + alloc r32=ar.pfs,1,5,4,0 +(p0) mov r37 = 0x1003f +(p0) fnorm f9 = f8 ;; +} + +// Form 2^64 in case need to scale denormal +{ .mfi +(p0) setf.exp f10 = r37 +(p0) fclass.m.unc p7, p8 = f8, 0xe3 +(p0) mov r34 = 0xffff ;; +} + +// qnan snan inf norm unorm 0 -+ +// 1 1 1 0 0 0 11 +// e 3 +// X ZERO, returns INT_MIN +// X INF or NAN, returns INT_MAX + +{ .mfi +(p0) mov r35 = 0x1ffff +(p8) fclass.m.unc p6, p8 = f8, 0x07 + nop.i 999 ;; +} +{ .mlx + nop.m 999 +(p7) movl r8 = 0x000000007fffffff ;; +} + +{ .mib + nop.m 999 + nop.i 999 +(p6) br.cond.spnt L(ILOGB_ZERO) ;; +} + +// Test for denormal +{ .mfi + nop.m 999 +(p8) fclass.m.unc p9, p0 = f9, 0x0b + nop.i 999 ;; +} + +L(ILOGB_COMMON): +// X NORMAL returns true exponent +{ .mmi + nop.m 999 +(p8) getf.exp r33 = f9 + nop.i 999 ;; +} + +// If denormal add 64 to exponent bias for scaling +{ .mfb +(p9) add r34 = 64, r34 + nop.f 999 +(p9) br.cond.spnt L(ILOGB_DENORM) ;; +} + +{ .mmi +(p8) and r36 = r35, r33 + nop.m 999 + nop.i 999 ;; +} + +{ .mib +(p8) sub r8 = r36, r34 + nop.i 999 +(p0) br.ret.sptk b0 ;; +} + +L(ILOGB_DENORM): +// Here if x denormal +// Form x * 2^64 which is normal +// Return to common code +{ .mfb + cmp.eq p8,p9 = r0,r0 + fmpy f9 = f9, f10 + br.cond.sptk L(ILOGB_COMMON) ;; +} + +// X ZERO +// return INT_MIN, call error support +L(ILOGB_ZERO): +{.mlx + mov GR_Parameter_TAG = 156 +(p6) movl r33 = 0x0000000080000000 ;; +};; +.endp ilogbl +ASM_SIZE_DIRECTIVE(ilogbl) + +.proc __libm_error_region +__libm_error_region: +.prologue +{ .mfi + add GR_Parameter_Y=-32,sp // Parameter 2 value + nop.f 0 +.save ar.pfs,GR_SAVE_PFS + mov GR_SAVE_PFS=ar.pfs // Save ar.pfs +} +{ .mfi +.fframe 64 + add sp=-64,sp // Create new stack + nop.f 0 + mov GR_SAVE_GP=gp // Save gp +};; +{ .mmi + stfe [GR_Parameter_Y] = FR_Y,16 // Save Parameter 2 on stack + add GR_Parameter_X = 16,sp // Parameter 1 address +.save b0, GR_SAVE_B0 + mov GR_SAVE_B0=b0 // Save b0 +};; +.body +{ .mib + stfe [GR_Parameter_X] = FR_X // Store Parameter 1 on stack + add GR_Parameter_RESULT = 0,GR_Parameter_Y + nop.b 0 // Parameter 3 address +} +{ .mib + stfe [GR_Parameter_Y] = FR_RESULT // Store Parameter 3 on stack + add GR_Parameter_Y = -16,GR_Parameter_Y + br.call.sptk b0=__libm_error_support# // Call error handling function +};; +{ .mmi + nop.m 0 + nop.m 0 + add GR_Parameter_RESULT = 48,sp +};; +{ .mmi + mov r8 = r33 // Store result +.restore sp + add sp = 64,sp // Restore stack pointer + mov b0 = GR_SAVE_B0 // Restore return address +};; +{ .mib + mov gp = GR_SAVE_GP // Restore gp + mov ar.pfs = GR_SAVE_PFS // Restore ar.pfs + br.ret.sptk b0 // Return +};; + +.endp __libm_error_region +ASM_SIZE_DIRECTIVE(__libm_error_region) + +.type __libm_error_support#,@function +.global __libm_error_support# |