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-rw-r--r--sysdeps/ia64/fpu/s_ceil.S274
1 files changed, 118 insertions, 156 deletions
diff --git a/sysdeps/ia64/fpu/s_ceil.S b/sysdeps/ia64/fpu/s_ceil.S
index f7e6d2cfa6..d1d2980618 100644
--- a/sysdeps/ia64/fpu/s_ceil.S
+++ b/sysdeps/ia64/fpu/s_ceil.S
@@ -1,10 +1,10 @@
.file "ceil.s"
-// Copyright (C) 2000, 2001, Intel Corporation
+
+// Copyright (c) 2000 - 2003, 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.
+//
+// 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
@@ -20,90 +20,67 @@
// * 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
+
+// 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
+// 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
+// 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.
-//
+// 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.
+// problem reports or change requests be submitted to it directly at
+// http://www.intel.com/software/products/opensource/libraries/num.htm.
//
-
-#include "libm_support.h"
-
-.align 32
-.global ceil#
-
-.section .text
-.proc ceil#
-.align 32
-
// History
//==============================================================
-// 2/02/00: Initial version
-// 6/13/00: Improved speed
-// 6/27/00: Eliminated incorrect invalid flag setting
+// 02/02/00 Initial version
+// 06/13/00 Improved speed
+// 06/27/00 Eliminated incorrect invalid flag setting
+// 05/20/02 Cleaned up namespace and sf0 syntax
+// 01/28/03 Improved performance
+//==============================================================
// API
//==============================================================
// double ceil(double x)
+//==============================================================
-// general input registers:
-
-ceil_GR_FFFF = r14
-ceil_GR_signexp = r15
-ceil_GR_exponent = r16
-ceil_GR_expmask = r17
-ceil_GR_bigexp = r18
-
-
-// predicate registers used:
+// general input registers:
+// r14 - r19
-// p6 ==> Input is NaN, infinity, zero
-// p7 ==> Input is denormal
-// p8 ==> Input is <0
-// p9 ==> Input is >=0
-// p10 ==> Input is already an integer (bigger than largest integer)
-// p11 ==> Input is not a large integer
-// p12 ==> Input is a smaller integer
-// p13 ==> Input is not an even integer, so inexact must be set
-// p14 ==> Input is between -1 and 0, so result will be -0 and inexact
+rSignexp = r14
+rExp = r15
+rExpMask = r16
+rBigexp = r17
+rM1 = r18
+rSignexpM1 = r19
+// floating-point registers:
+// f8 - f13
-// floating-point registers used:
+fXInt = f9
+fNormX = f10
+fTmp = f11
+fAdj = f12
+fPreResult = f13
-CEIL_SIGNED_ZERO = f7
-CEIL_NORM_f8 = f9
-CEIL_FFFF = f10
-CEIL_INEXACT = f11
-CEIL_FLOAT_INT_f8 = f12
-CEIL_INT_f8 = f13
-CEIL_adj = f14
-CEIL_MINUS_ONE = f15
+// predicate registers used:
+// p6 - p10
// Overview of operation
//==============================================================
-
// double ceil(double x)
-// Return an integer value (represented as a double) that is the smallest
+// Return an integer value (represented as a double) that is the smallest
// value not less than x
// This is x rounded toward +infinity to an integral value.
// Inexact is set if x != ceil(x)
-// **************************************************************************
-
-// Set denormal flag for denormal input and
-// and take denormal fault if necessary.
-
-// Is the input an integer value already?
+//==============================================================
// double_extended
// if the exponent is > 1003e => 3F(true) = 63(decimal)
@@ -124,139 +101,124 @@ CEIL_MINUS_ONE = f15
// If we multiply by 2^23, we no longer have a fractional part
// So input is an integer value already.
-// If x is NAN, ZERO, or INFINITY, then return
-
-// qnan snan inf norm unorm 0 -+
-// 1 1 1 0 0 1 11 0xe7
-
-ceil:
+.section .text
+GLOBAL_LIBM_ENTRY(ceil)
{ .mfi
- getf.exp ceil_GR_signexp = f8
- fcvt.fx.trunc.s1 CEIL_INT_f8 = f8
- addl ceil_GR_bigexp = 0x10033, r0
+ getf.exp rSignexp = f8 // Get signexp, recompute if unorm
+ fclass.m p7,p0 = f8, 0x0b // Test x unorm
+ addl rBigexp = 0x10033, r0 // Set exponent at which is integer
}
{ .mfi
- addl ceil_GR_FFFF = -1,r0
- fcmp.lt.s1 p8,p9 = f8,f0
- mov ceil_GR_expmask = 0x1FFFF ;;
+ mov rM1 = -1 // Set all ones
+ fcvt.fx.trunc.s1 fXInt = f8 // Convert to int in significand
+ mov rExpMask = 0x1FFFF // Form exponent mask
}
+;;
-// p7 ==> denorm
{ .mfi
- setf.sig CEIL_FFFF = ceil_GR_FFFF
- fclass.m p7,p0 = f8, 0x0b
- nop.i 999
+ mov rSignexpM1 = 0x2FFFF // Form signexp of -1
+ fcmp.lt.s1 p8,p9 = f8, f0 // Test x < 0
+ nop.i 0
}
-{ .mfi
- nop.m 999
- fnorm CEIL_NORM_f8 = f8
- nop.i 999 ;;
+{ .mfb
+ setf.sig fTmp = rM1 // Make const for setting inexact
+ fnorm.s1 fNormX = f8 // Normalize input
+(p7) br.cond.spnt CEIL_UNORM // Branch if x unorm
}
+;;
-// Form 0 with sign of input in case negative zero is needed
-{ .mfi
- nop.m 999
- fmerge.s CEIL_SIGNED_ZERO = f8, f0
- nop.i 999
-}
+CEIL_COMMON:
+// Return here from CEIL_UNORM
{ .mfi
- nop.m 999
- fsub.s1 CEIL_MINUS_ONE = f0, f1
- nop.i 999 ;;
-}
-
-// p6 ==> NAN, INF, ZERO
-{ .mfb
- nop.m 999
- fclass.m p6,p10 = f8, 0xe7
-(p7) br.cond.spnt L(CEIL_DENORM) ;;
+ nop.m 0
+ fclass.m p6,p0 = f8, 0x1e7 // Test x natval, nan, inf, 0
+ nop.i 0
}
+;;
-L(CEIL_COMMON):
.pred.rel "mutex",p8,p9
-// Set adjustment to add to trunc(x) for result
-// If x>0, adjustment is 1.0
-// If x<=0, adjustment is 0.0
{ .mfi
- and ceil_GR_exponent = ceil_GR_signexp, ceil_GR_expmask
-(p9) fadd.s1 CEIL_adj = f1,f0
- nop.i 999
+ nop.m 0
+(p8) fma.s1 fAdj = f0, f0, f0 // If x < 0, adjustment is 0
+ nop.i 0
}
{ .mfi
- nop.m 999
-(p8) fadd.s1 CEIL_adj = f0,f0
- nop.i 999 ;;
+ nop.m 0
+(p9) fma.s1 fAdj = f1, f1, f0 // If x > 0, adjustment is +1
+ nop.i 0
}
+;;
{ .mfi
-(p10) cmp.ge.unc p10,p11 = ceil_GR_exponent, ceil_GR_bigexp
-(p6) fnorm.d f8 = f8
- nop.i 999 ;;
+ nop.m 0
+ fcvt.xf fPreResult = fXInt // trunc(x)
+ nop.i 0
}
-
-{ .mfi
- nop.m 999
-(p11) fcvt.xf CEIL_FLOAT_INT_f8 = CEIL_INT_f8
- nop.i 999 ;;
+{ .mfb
+ nop.m 0
+(p6) fma.d.s0 f8 = f8, f1, f0 // Result if x natval, nan, inf, 0
+(p6) br.ret.spnt b0 // Exit if x natval, nan, inf, 0
}
+;;
-{ .mfi
- nop.m 999
-(p10) fnorm.d f8 = CEIL_NORM_f8
- nop.i 999 ;;
+{ .mmi
+ and rExp = rSignexp, rExpMask // Get biased exponent
+;;
+ cmp.ge p7,p6 = rExp, rBigexp // Is |x| >= 2^52?
+(p8) cmp.lt.unc p10,p0 = rSignexp, rSignexpM1 // Is -1 < x < 0?
}
+;;
-// Is -1 < x < 0? If so, result will be -0. Special case it with p14 set.
+// If -1 < x < 0, we turn off p6 and compute result as -0
{ .mfi
- nop.m 999
-(p8) fcmp.gt.unc.s1 p14,p0 = CEIL_NORM_f8, CEIL_MINUS_ONE
- nop.i 999 ;;
+(p10) cmp.ne p6,p0 = r0,r0
+(p10) fmerge.s f8 = fNormX, f0
+ nop.i 0
}
+;;
+.pred.rel "mutex",p6,p7
{ .mfi
-(p14) cmp.ne p11,p0 = r0,r0
-(p14) fnorm.d f8 = CEIL_SIGNED_ZERO
- nop.i 999
+ nop.m 0
+(p6) fma.d.s0 f8 = fPreResult, f1, fAdj // Result if !int, |x| < 2^52
+ nop.i 0
}
{ .mfi
- nop.m 999
-(p14) fmpy.s0 CEIL_INEXACT = CEIL_FFFF,CEIL_FFFF
- nop.i 999 ;;
+ nop.m 0
+(p7) fma.d.s0 f8 = fNormX, f1, f0 // Result, if |x| >= 2^52
+(p10) cmp.eq p6,p0 = r0,r0 // If -1 < x < 0, turn on p6 again
}
+;;
{ .mfi
- nop.m 999
-(p11) fadd.d f8 = CEIL_FLOAT_INT_f8,CEIL_adj
- nop.i 999 ;;
-}
-{ .mfi
- nop.m 999
-(p11) fcmp.eq.unc.s1 p12,p13 = CEIL_FLOAT_INT_f8, CEIL_NORM_f8
- nop.i 999 ;;
+ nop.m 0
+(p6) fcmp.eq.unc.s1 p8, p9 = fPreResult, fNormX // Is trunc(x) = x ?
+ nop.i 0
}
+;;
-// Set inexact if result not equal to input
{ .mfi
- nop.m 999
-(p13) fmpy.s0 CEIL_INEXACT = CEIL_FFFF,CEIL_FFFF
- nop.i 999
+ nop.m 0
+(p9) fmpy.s0 fTmp = fTmp, fTmp // Dummy to set inexact
+ nop.i 0
}
-// Set result to input if integer
{ .mfb
- nop.m 999
-(p12) fnorm.d f8 = CEIL_NORM_f8
- br.ret.sptk b0 ;;
+ nop.m 0
+(p8) fma.d.s0 f8 = fNormX, f1, f0 // If x int, result normalized x
+ br.ret.sptk b0 // Exit main path, 0 < |x| < 2^52
}
+;;
+
-// Here if input denorm
-L(CEIL_DENORM):
+CEIL_UNORM:
+// Here if x unorm
{ .mfb
- getf.exp ceil_GR_signexp = CEIL_NORM_f8
- fcvt.fx.trunc.s1 CEIL_INT_f8 = CEIL_NORM_f8
- br.cond.sptk L(CEIL_COMMON) ;;
+ getf.exp rSignexp = fNormX // Get signexp, recompute if unorm
+ fcmp.eq.s0 p7,p0 = f8, f0 // Dummy op to set denormal flag
+ br.cond.sptk CEIL_COMMON // Return to main path
}
+;;
-.endp ceil
-ASM_SIZE_DIRECTIVE(ceil)
+GLOBAL_LIBM_END(ceil)