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-rw-r--r--sysdeps/ia64/fpu/s_truncl.S209
1 files changed, 122 insertions, 87 deletions
diff --git a/sysdeps/ia64/fpu/s_truncl.S b/sysdeps/ia64/fpu/s_truncl.S
index 1afa19ba2b..91bf96ce90 100644
--- a/sysdeps/ia64/fpu/s_truncl.S
+++ b/sysdeps/ia64/fpu/s_truncl.S
@@ -1,10 +1,11 @@
.file "truncl.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 7/7/2000 by John Harrison, Cristina Iordache, 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
@@ -20,57 +21,59 @@
// * 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.
//
+.align 32
+.global truncl#
+
+.section .text
+.proc truncl#
+.align 32
+
// History
//==============================================================
-// 07/07/00 Created
-// 05/20/02 Cleaned up namespace and sf0 syntax
-// 01/20/03 Improved performance and reduced code size
+// 7/7/00: Created
//==============================================================
// API
//==============================================================
-// long double truncl(long double x)
+// long double truncl(float x)
//==============================================================
-// general input registers:
-// r14 - r18
+#include "libm_support.h"
-rExpBias = r14
-rSignexp = r15
-rExp = r16
-rExpMask = r17
-rBigexp = r18
+// general input registers:
+TRUNC_GR_FFFF = r14
+TRUNC_GR_signexp = r15
+TRUNC_GR_exponent = r16
+TRUNC_GR_expmask = r17
+TRUNC_GR_bigexp = r18
// floating-point registers:
-// f8 - f10
+// f8, f9, f11, f12
-fXtruncInt = f9
-fNormX = f10
-
-// predicate registers used:
-// p6, p7
+// predicate registers used:
+// p6, p7, p8, p9, p10, p11
// Overview of operation
//==============================================================
// long double truncl(long double x)
-// Return an integer value (represented as a long double) less than or
+// Return an integer value (represented as a long double) less than or
// equal to x in magnitude.
// This is x rounded toward zero to an integral value.
//==============================================================
@@ -94,73 +97,105 @@ fNormX = f10
// If we multiply by 2^23, we no longer have a fractional part
// So input is an integer value already.
-.section .text
-GLOBAL_LIBM_ENTRY(truncl)
+truncl:
{ .mfi
- getf.exp rSignexp = f8 // Get signexp, recompute if unorm
- fcvt.fx.trunc.s1 fXtruncInt = f8 // Convert to int in significand
- addl rBigexp = 0x1003e, r0 // Set exponent at which is integer
+ getf.exp TRUNC_GR_signexp = f8
+ fcvt.fx.trunc.s1 f9 = f8
+ addl TRUNC_GR_bigexp = 0x1003e, r0
}
{ .mfi
- mov rExpBias = 0x0FFFF // Form exponent bias
- fnorm.s1 fNormX = f8 // Normalize input
- mov rExpMask = 0x1FFFF // Form exponent mask
-}
-;;
+ mov TRUNC_GR_FFFF = 0x0FFFF
+ fnorm f11 = f8
+ mov TRUNC_GR_expmask = 0x1FFFF
+};;
+// get the exponent of x
+// convert x to integer in signficand of f9
+// Normalize x - this will raise invalid on SNaNs, the
+// denormal operand flag - and possibly a spurious U flag
+// get exponent only mask (will exclude sign bit)
{ .mfi
nop.m 0
- fclass.m p7,p0 = f8, 0x0b // Test x unorm
+ fclass.m p7,p8 = f8, 0x0b
nop.i 0
}
-;;
-
-{ .mfb
+{ .mfi
nop.m 0
- fclass.m p6,p0 = f8, 0x1e3 // Test x natval, nan, inf
-(p7) br.cond.spnt TRUNC_UNORM // Branch if x unorm
-}
-;;
-
-TRUNC_COMMON:
-// Return here from TRUNC_UNORM
+ fcmp.eq.unc.s1 p9,p0 = f8,f0
+ nop.i 0
+};;
+// fclass to set p7 if unnorm
+{ .mmi
+ and TRUNC_GR_exponent = TRUNC_GR_signexp, TRUNC_GR_expmask ;;
+(p8) cmp.ge.unc p10,p11 = TRUNC_GR_exponent, TRUNC_GR_bigexp
+(p8) cmp.ne.unc p6,p0 = TRUNC_GR_exponent, TRUNC_GR_signexp
+};;
+// Get the exponent of x
+// Test if exponent such that result already an integer
+// Test if x < 0
+{ .mmi
+(p9) cmp.eq.andcm p10,p11 = r0, r0
+(p6) cmp.lt.unc p6,p0 = TRUNC_GR_exponent, TRUNC_GR_FFFF
+ nop.i 0
+};;
+// If -1 < x < 0, set p6, turn off p10 and p11, and set result to -0.0
+{ .mfb
+(p6) cmp.eq.andcm p10,p11 = r0, r0
+(p6) fmerge.s f8 = f8, f0
+ nop.b 0
+};;
+// If not a unnorm, set p10 if x already is a big int, nan, or inf?
+// If not a unnorm, set p10 if x already is a big int, nan, or inf?
+.pred.rel "mutex",p10,p11
{ .mfb
- and rExp = rSignexp, rExpMask // Get biased exponent
-(p6) fma.s0 f8 = f8, f1, f0 // Result if x natval, nan, inf
-(p6) br.ret.spnt b0 // Exit if x natval, nan, inf
-}
-;;
-
-{ .mfi
- cmp.lt p6,p0 = rExp, rExpBias // Is |x| < 1?
- fcvt.xf f8 = fXtruncInt // Result, assume 1 <= |x| < 2^63
- cmp.ge p7,p0 = rExp, rBigexp // Is |x| >= 2^63?
-}
-;;
-
-// We must correct result if |x| < 1, or |x| >= 2^63
-.pred.rel "mutex",p6,p7
-{ .mfi
nop.m 0
-(p6) fmerge.s f8 = fNormX, f0 // If |x| < 1, result sgn(x)*0
- nop.i 0
+(p11) fcvt.xf f8 = f9
+ nop.b 0
}
{ .mfb
nop.m 0
-(p7) fma.s0 f8 = fNormX, f1, f0 // If |x| >= 2^63, result x
- br.ret.sptk b0 // Exit main path
-}
-;;
-
-
-TRUNC_UNORM:
-// Here if x unorm
+(p10) fma.s1 f8 = f11,f1,f0
+(p8) br.ret.sptk b0
+};;
+// If not a unnorm and not an big int, nan,or +/-inf convert signficand
+// back to f8.
+// If not a unorm and a big int, nan, or +/-inf, return fnorm'd x
+// If not a unorm, Return
+// If unnorm, get the exponent again - perhaps it wasn't a denorm.
+{ .mfb
+(p7) getf.exp TRUNC_GR_signexp = f11
+(p7) fcvt.fx.trunc.s1 f12 = f11
+ nop.b 0
+};;
+{ .mfb
+ and TRUNC_GR_exponent = TRUNC_GR_signexp, TRUNC_GR_expmask
+ fcmp.lt.unc.s1 p9,p0 = f8,f0
+ nop.b 0
+};;
{ .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 TRUNC_COMMON // Return to main path
+ cmp.ge.unc p10,p11 = TRUNC_GR_exponent, TRUNC_GR_bigexp
+ nop.f 0
+ nop.b 0
+};;
+// If a unnorm, check to see if value is already a big int.
+{ .mfb
+ nop.m 0
+(p11) fcvt.xf f8 = f12
+ nop.b 0
}
-;;
-
-GLOBAL_LIBM_END(truncl)
+{ .mfi
+ nop.m 0
+(p10) fma.s1 f8 = f11,f1,f0
+ nop.i 0
+};;
+{ .mfb
+ nop.m 0
+(p9) fmerge.ns f8 = f1,f8
+ br.ret.sptk b0
+};;
+// If so return it. Otherwise, return (fcvt.xf(fcvt.fx.trunc(x)))
+// Make sure the result is negative if it should be - that is
+// negative(denormal) -> -0.
+.endp truncl
+ASM_SIZE_DIRECTIVE(truncl)