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-rw-r--r--sysdeps/ia64/fpu/s_ceil.S274
1 files changed, 156 insertions, 118 deletions
diff --git a/sysdeps/ia64/fpu/s_ceil.S b/sysdeps/ia64/fpu/s_ceil.S
index d1d2980618..f7e6d2cfa6 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 - 2003, Intel Corporation
+// Copyright (C) 2000, 2001, Intel Corporation
// All rights reserved.
-//
-// Contributed 2000 by the Intel Numerics Group, Intel Corporation
+//
+// 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.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
@@ -20,67 +20,90 @@
// * 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://www.intel.com/software/products/opensource/libraries/num.htm.
+// problem reports or change requests be submitted to it directly at
+// http://developer.intel.com/opensource.
//
+
+#include "libm_support.h"
+
+.align 32
+.global ceil#
+
+.section .text
+.proc ceil#
+.align 32
+
// History
//==============================================================
-// 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
-//==============================================================
+// 2/02/00: Initial version
+// 6/13/00: Improved speed
+// 6/27/00: Eliminated incorrect invalid flag setting
// API
//==============================================================
// double ceil(double x)
-//==============================================================
-// general input registers:
-// r14 - r19
+// general input registers:
+
+ceil_GR_FFFF = r14
+ceil_GR_signexp = r15
+ceil_GR_exponent = r16
+ceil_GR_expmask = r17
+ceil_GR_bigexp = r18
+
-rSignexp = r14
-rExp = r15
-rExpMask = r16
-rBigexp = r17
-rM1 = r18
-rSignexpM1 = r19
+// predicate registers used:
-// floating-point registers:
-// f8 - f13
+// 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
-fXInt = f9
-fNormX = f10
-fTmp = f11
-fAdj = f12
-fPreResult = f13
-// predicate registers used:
-// p6 - p10
+// floating-point registers used:
+
+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
// 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)
@@ -101,124 +124,139 @@ fPreResult = f13
// 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
-.section .text
-GLOBAL_LIBM_ENTRY(ceil)
+
+ceil:
{ .mfi
- 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
+ getf.exp ceil_GR_signexp = f8
+ fcvt.fx.trunc.s1 CEIL_INT_f8 = f8
+ addl ceil_GR_bigexp = 0x10033, r0
}
{ .mfi
- mov rM1 = -1 // Set all ones
- fcvt.fx.trunc.s1 fXInt = f8 // Convert to int in significand
- mov rExpMask = 0x1FFFF // Form exponent mask
+ addl ceil_GR_FFFF = -1,r0
+ fcmp.lt.s1 p8,p9 = f8,f0
+ mov ceil_GR_expmask = 0x1FFFF ;;
}
-;;
+// p7 ==> denorm
{ .mfi
- mov rSignexpM1 = 0x2FFFF // Form signexp of -1
- fcmp.lt.s1 p8,p9 = f8, f0 // Test x < 0
- nop.i 0
+ setf.sig CEIL_FFFF = ceil_GR_FFFF
+ fclass.m p7,p0 = f8, 0x0b
+ 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
+{ .mfi
+ nop.m 999
+ fnorm CEIL_NORM_f8 = f8
+ nop.i 999 ;;
}
-;;
-CEIL_COMMON:
-// Return here from CEIL_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
+}
{ .mfi
- nop.m 0
- fclass.m p6,p0 = f8, 0x1e7 // Test x natval, nan, inf, 0
- nop.i 0
+ 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) ;;
}
-;;
+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
- nop.m 0
-(p8) fma.s1 fAdj = f0, f0, f0 // If x < 0, adjustment is 0
- nop.i 0
+ and ceil_GR_exponent = ceil_GR_signexp, ceil_GR_expmask
+(p9) fadd.s1 CEIL_adj = f1,f0
+ nop.i 999
}
{ .mfi
- nop.m 0
-(p9) fma.s1 fAdj = f1, f1, f0 // If x > 0, adjustment is +1
- nop.i 0
+ nop.m 999
+(p8) fadd.s1 CEIL_adj = f0,f0
+ nop.i 999 ;;
}
-;;
{ .mfi
- nop.m 0
- fcvt.xf fPreResult = fXInt // trunc(x)
- nop.i 0
+(p10) cmp.ge.unc p10,p11 = ceil_GR_exponent, ceil_GR_bigexp
+(p6) fnorm.d f8 = 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
+(p11) fcvt.xf CEIL_FLOAT_INT_f8 = CEIL_INT_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?
+{ .mfi
+ nop.m 999
+(p10) fnorm.d f8 = CEIL_NORM_f8
+ nop.i 999 ;;
}
-;;
-// If -1 < x < 0, we turn off p6 and compute result as -0
+// Is -1 < x < 0? If so, result will be -0. Special case it with p14 set.
{ .mfi
-(p10) cmp.ne p6,p0 = r0,r0
-(p10) fmerge.s f8 = fNormX, f0
- nop.i 0
+ nop.m 999
+(p8) fcmp.gt.unc.s1 p14,p0 = CEIL_NORM_f8, CEIL_MINUS_ONE
+ nop.i 999 ;;
}
-;;
-.pred.rel "mutex",p6,p7
{ .mfi
- nop.m 0
-(p6) fma.d.s0 f8 = fPreResult, f1, fAdj // Result if !int, |x| < 2^52
- nop.i 0
+(p14) cmp.ne p11,p0 = r0,r0
+(p14) fnorm.d f8 = CEIL_SIGNED_ZERO
+ nop.i 999
}
{ .mfi
- 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
+ nop.m 999
+(p14) fmpy.s0 CEIL_INEXACT = CEIL_FFFF,CEIL_FFFF
+ nop.i 999 ;;
}
-;;
{ .mfi
- nop.m 0
-(p6) fcmp.eq.unc.s1 p8, p9 = fPreResult, fNormX // Is trunc(x) = x ?
- nop.i 0
+ 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 ;;
}
-;;
+// Set inexact if result not equal to input
{ .mfi
- nop.m 0
-(p9) fmpy.s0 fTmp = fTmp, fTmp // Dummy to set inexact
- nop.i 0
+ nop.m 999
+(p13) fmpy.s0 CEIL_INEXACT = CEIL_FFFF,CEIL_FFFF
+ nop.i 999
}
+// Set result to input if integer
{ .mfb
- 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
+ nop.m 999
+(p12) fnorm.d f8 = CEIL_NORM_f8
+ br.ret.sptk b0 ;;
}
-;;
-
-CEIL_UNORM:
-// Here if x unorm
+// Here if input denorm
+L(CEIL_DENORM):
{ .mfb
- 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
+ getf.exp ceil_GR_signexp = CEIL_NORM_f8
+ fcvt.fx.trunc.s1 CEIL_INT_f8 = CEIL_NORM_f8
+ br.cond.sptk L(CEIL_COMMON) ;;
}
-;;
-GLOBAL_LIBM_END(ceil)
+.endp ceil
+ASM_SIZE_DIRECTIVE(ceil)