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-.file "libm_scalbnf.s"
-
-
-// Copyright (c) 2000 - 2003, Intel Corporation
-// All rights reserved.
-//
-// Contributed 2000 by the Intel Numerics Group, Intel Corporation
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//
-// * Redistributions in binary form must reproduce the above copyright
-// notice, this list of conditions and the following disclaimer in the
-// documentation and/or other materials provided with the distribution.
-//
-// * The name of Intel Corporation may not be used to endorse or promote
-// products derived from this software without specific prior written
-// permission.
-
-// 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://www.intel.com/software/products/opensource/libraries/num.htm.
-//
-// History
-//==============================================================
-// 02/02/00 Initial version
-// 01/26/01 Scalbnf completely reworked and now standalone version
-// 01/04/02 Added handling for int 32 or 64 bits
-// 05/20/02 Cleaned up namespace and sf0 syntax
-// 02/10/03 Reordered header: .section, .global, .proc, .align
-// 08/04/03 Improved performance
-//
-// API
-//==============================================================
-// float __libm_scalbnf (float x, int n, int int_type)
-// input floating point f8 and int n (r33), int int_type (r34)
-// output floating point f8
-//
-// int_type = 0 if int is 32 bits
-// int_type = 1 if int is 64 bits
-//
-// Returns x* 2**n using an fma and detects overflow
-// and underflow.
-//
-//
-// Strategy:
-// Compute biased exponent of result exp_Result = N + exp_X
-// Break into ranges:
-// exp_Result > 0x1007e -> Certain overflow
-// exp_Result = 0x1007e -> Possible overflow
-// 0x0ff81 <= exp_Result < 0x1007e -> No over/underflow (main path)
-// 0x0ff81 - 23 <= exp_Result < 0x0ff81 -> Possible underflow
-// exp_Result < 0x0ff81 - 23 -> Certain underflow
-
-FR_Big = f6
-FR_NBig = f7
-FR_Floating_X = f8
-FR_Result = f8
-FR_Result2 = f9
-FR_Result3 = f10
-FR_Norm_X = f11
-FR_Two_N = f12
-
-GR_neg_ov_limit= r14
-GR_N_Biased = r15
-GR_Big = r16
-GR_NBig = r17
-GR_exp_Result = r18
-GR_pos_ov_limit= r19
-GR_Bias = r20
-GR_N_as_int = r21
-GR_signexp_X = r22
-GR_exp_X = r23
-GR_exp_mask = r24
-GR_max_exp = r25
-GR_min_exp = r26
-GR_min_den_exp = r27
-
-GR_SAVE_B0 = r32
-GR_SAVE_GP = r33
-GR_SAVE_PFS = r34
-GR_Parameter_X = r35
-GR_Parameter_Y = r36
-GR_Parameter_RESULT = r37
-GR_Tag = r38
-
-.section .text
-GLOBAL_LIBM_ENTRY(__libm_scalbnf)
-
-//
-// Is x NAN, INF, ZERO, +-?
-// Build the exponent Bias
-//
-{ .mfi
- getf.exp GR_signexp_X = FR_Floating_X // Get signexp of x
- fclass.m p6,p0 = FR_Floating_X, 0xe7 // @snan | @qnan | @inf | @zero
- mov GR_Bias = 0x0ffff
-}
-//
-// Normalize x
-// Is integer type 32 bits?
-//
-{ .mfi
- mov GR_Big = 35000 // If N this big then certain overflow
- fnorm.s1 FR_Norm_X = FR_Floating_X
- cmp.eq p8,p9 = r34,r0
-}
-;;
-
-// Sign extend N if int is 32 bits
-{ .mfi
-(p9) mov GR_N_as_int = r33 // Copy N if int is 64 bits
- fclass.m p9,p0 = FR_Floating_X, 0x0b // Test for x=unorm
-(p8) sxt4 GR_N_as_int = r33 // Sign extend N if int is 32 bits
-}
-{ .mfi
- mov GR_NBig = -35000 // If N this small then certain underflow
- nop.f 0
- mov GR_max_exp = 0x1007e // Exponent of maximum float
-}
-;;
-
-// Create biased exponent for 2**N
-{ .mfi
- add GR_N_Biased = GR_Bias,GR_N_as_int
- nop.f 0
- cmp.ge p7, p0 = GR_N_as_int, GR_Big // Certain overflow?
-}
-{ .mib
- cmp.le p8, p0 = GR_N_as_int, GR_NBig // Certain underflow?
- mov GR_min_exp = 0x0ff81 // Exponent of minimum float
-(p9) br.cond.spnt SCALBNF_UNORM // Branch if x=unorm
-}
-;;
-
-SCALBNF_COMMON:
-// Main path continues. Also return here from x=unorm path.
-// Create 2**N
-.pred.rel "mutex",p7,p8
-{ .mfi
- setf.exp FR_Two_N = GR_N_Biased
- nop.f 0
-(p7) mov GR_N_as_int = GR_Big // Limit max N
-}
-{ .mfi
-(p8) mov GR_N_as_int = GR_NBig // Limit min N
- nop.f 0
-(p8) cmp.eq p7,p0 = r0,r0 // Set p7 if |N| big
-}
-;;
-
-//
-// Create biased exponent for 2**N for N big
-// Is N zero?
-//
-{ .mfi
-(p7) add GR_N_Biased = GR_Bias,GR_N_as_int
- nop.f 0
- cmp.eq.or p6,p0 = r33,r0
-}
-{ .mfi
- mov GR_pos_ov_limit = 0x1007f // Exponent for positive overflow
- nop.f 0
- mov GR_exp_mask = 0x1ffff // Exponent mask
-}
-;;
-
-//
-// Create 2**N for N big
-// Return x when N = 0 or X = Nan, Inf, Zero
-//
-{ .mfi
-(p7) setf.exp FR_Two_N = GR_N_Biased
- nop.f 0
- mov GR_min_den_exp = 0x0ff81 - 23 // Exponent of min denorm float
-}
-{ .mfb
- and GR_exp_X = GR_exp_mask, GR_signexp_X
-(p6) fma.s.s0 FR_Result = FR_Floating_X, f1, f0
-(p6) br.ret.spnt b0
-}
-;;
-
-//
-// Raise Denormal operand flag with compare
-// Compute biased result exponent
-//
-{ .mfi
- add GR_exp_Result = GR_exp_X, GR_N_as_int
- fcmp.ge.s0 p0,p11 = FR_Floating_X,f0
- mov GR_neg_ov_limit = 0x3007f // Exponent for negative overflow
-}
-;;
-
-//
-// Do final operation
-//
-{ .mfi
- cmp.lt p7,p6 = GR_exp_Result, GR_max_exp // Test no overflow
- fma.s.s0 FR_Result = FR_Two_N,FR_Norm_X,f0
- cmp.lt p9,p0 = GR_exp_Result, GR_min_den_exp // Test sure underflow
-}
-{ .mfb
- nop.m 0
- nop.f 0
-(p9) br.cond.spnt SCALBNF_UNDERFLOW // Branch if certain underflow
-}
-;;
-
-{ .mib
-(p6) cmp.gt.unc p6,p8 = GR_exp_Result, GR_max_exp // Test sure overflow
-(p7) cmp.ge.unc p7,p9 = GR_exp_Result, GR_min_exp // Test no over/underflow
-(p7) br.ret.sptk b0 // Return from main path
-}
-;;
-
-{ .bbb
-(p6) br.cond.spnt SCALBNF_OVERFLOW // Branch if certain overflow
-(p8) br.cond.spnt SCALBNF_POSSIBLE_OVERFLOW // Branch if possible overflow
-(p9) br.cond.spnt SCALBNF_POSSIBLE_UNDERFLOW // Branch if possible underflow
-}
-;;
-
-// Here if possible underflow.
-// Resulting exponent: 0x0ff81-23 <= exp_Result < 0x0ff81
-SCALBNF_POSSIBLE_UNDERFLOW:
-//
-// Here if possible overflow.
-// Resulting exponent: 0x1007e = exp_Result
-SCALBNF_POSSIBLE_OVERFLOW:
-
-// Set up necessary status fields
-//
-// S0 user supplied status
-// S2 user supplied status + WRE + TD (Overflows)
-// S3 user supplied status + FZ + TD (Underflows)
-//
-{ .mfi
- nop.m 0
- fsetc.s3 0x7F,0x41
- nop.i 0
-}
-{ .mfi
- nop.m 0
- fsetc.s2 0x7F,0x42
- nop.i 0
-}
-;;
-
-//
-// Do final operation with s2 and s3
-//
-{ .mfi
- setf.exp FR_NBig = GR_neg_ov_limit
- fma.s.s3 FR_Result3 = FR_Two_N,FR_Norm_X,f0
- nop.i 0
-}
-{ .mfi
- setf.exp FR_Big = GR_pos_ov_limit
- fma.s.s2 FR_Result2 = FR_Two_N,FR_Norm_X,f0
- nop.i 0
-}
-;;
-
-// Check for overflow or underflow.
-// Restore s3
-// Restore s2
-//
-{ .mfi
- nop.m 0
- fsetc.s3 0x7F,0x40
- nop.i 0
-}
-{ .mfi
- nop.m 0
- fsetc.s2 0x7F,0x40
- nop.i 0
-}
-;;
-
-//
-// Is the result zero?
-//
-{ .mfi
- nop.m 0
- fclass.m p6, p0 = FR_Result3, 0x007
- nop.i 0
-}
-{ .mfi
- nop.m 0
- fcmp.ge.s1 p7, p8 = FR_Result2 , FR_Big
- nop.i 0
-}
-;;
-
-//
-// Detect masked underflow - Tiny + Inexact Only
-//
-{ .mfi
- nop.m 0
-(p6) fcmp.neq.unc.s1 p6, p0 = FR_Result , FR_Result2
- nop.i 0
-}
-;;
-
-//
-// Is result bigger the allowed range?
-// Branch out for underflow
-//
-{ .mfb
- nop.m 0
-(p8) fcmp.le.unc.s1 p9, p10 = FR_Result2 , FR_NBig
-(p6) br.cond.spnt SCALBNF_UNDERFLOW
-}
-;;
-
-//
-// Branch out for overflow
-//
-{ .bbb
-(p7) br.cond.spnt SCALBNF_OVERFLOW
-(p9) br.cond.spnt SCALBNF_OVERFLOW
- br.ret.sptk b0 // Return from main path.
-}
-;;
-
-// Here if result overflows
-SCALBNF_OVERFLOW:
-{ .mib
- alloc r32=ar.pfs,3,0,4,0
- addl GR_Tag = 178, r0 // Set error tag for overflow
- br.cond.sptk __libm_error_region // Call error support for overflow
-}
-;;
-
-// Here if result underflows
-SCALBNF_UNDERFLOW:
-{ .mib
- alloc r32=ar.pfs,3,0,4,0
- addl GR_Tag = 179, r0 // Set error tag for underflow
- br.cond.sptk __libm_error_region // Call error support for underflow
-}
-;;
-
-// Here if x=unorm
-SCALBNF_UNORM:
-{ .mib
- getf.exp GR_signexp_X = FR_Norm_X // Get signexp of normalized x
- nop.i 0
- br.cond.sptk SCALBNF_COMMON // Return to main path
-}
-;;
-
-
-GLOBAL_LIBM_END(__libm_scalbnf)
-LOCAL_LIBM_ENTRY(__libm_error_region)
-
-//
-// Get stack address of N
-//
-.prologue
-{ .mfi
- add GR_Parameter_Y=-32,sp
- nop.f 0
-.save ar.pfs,GR_SAVE_PFS
- mov GR_SAVE_PFS=ar.pfs
-}
-//
-// Adjust sp
-//
-{ .mfi
-.fframe 64
- add sp=-64,sp
- nop.f 0
- mov GR_SAVE_GP=gp
-};;
-
-//
-// Store N on stack in correct position
-// Locate the address of x on stack
-//
-{ .mmi
- st8 [GR_Parameter_Y] = GR_N_as_int,16
- add GR_Parameter_X = 16,sp
-.save b0, GR_SAVE_B0
- mov GR_SAVE_B0=b0
-};;
-
-//
-// Store x on the stack.
-// Get address for result on stack.
-//
-.body
-{ .mib
- stfs [GR_Parameter_X] = FR_Norm_X
- add GR_Parameter_RESULT = 0,GR_Parameter_Y
- nop.b 0
-}
-{ .mib
- stfs [GR_Parameter_Y] = FR_Result
- add GR_Parameter_Y = -16,GR_Parameter_Y
- br.call.sptk b0=__libm_error_support#
-};;
-
-//
-// Get location of result on stack
-//
-{ .mmi
- add GR_Parameter_RESULT = 48,sp
- nop.m 0
- nop.i 0
-};;
-
-//
-// Get the new result
-//
-{ .mmi
- ldfs FR_Result = [GR_Parameter_RESULT]
-.restore sp
- add sp = 64,sp
- mov b0 = GR_SAVE_B0
-};;
-
-//
-// Restore gp, ar.pfs and return
-//
-{ .mib
- mov gp = GR_SAVE_GP
- mov ar.pfs = GR_SAVE_PFS
- br.ret.sptk b0
-};;
-
-LOCAL_LIBM_END(__libm_error_region)
-
-.type __libm_error_support#,@function
-.global __libm_error_support#