Correct powerpc64 s_floorl edge cases (bug 13886).

[BZ #13886]
Remove powerpc64/fpu/s_floorl.  Use fully correct ldbl-128bim/s_floorl.c.

5 files changed, 28 insertions, 137 deletions

diff --git a/ChangeLog b/ChangeLog
index e69155ec78..b8ba4095bc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2012-04-24  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
+
+	[BZ #13886]
+	* sysdeps/powerpc/powerpc64/fpu/s_floorl.S: Delete file. Use the
+	sysdeps/ieee754/ldbl-128ibm/s_floorl.c version instead.
+	* math/libm-test.inc (floor_test): Add more tests.
+	* sysdeps/powerpc/fpu/libm-test-ulps: Update for pow tests.
+
 2012-04-24  Joseph Myers  <joseph@codesourcery.com>
 
 	* sysdeps/unix/getdents.c: Remove file.
diff --git a/NEWS b/NEWS
index f6150422ed..00620ff42c 100644
--- a/NEWS
+++ b/NEWS
@@ -19,10 +19,10 @@ Version 2.16
   13551, 13552, 13553, 13555, 13559, 13566, 13583, 13592, 13618, 13637,
   13656, 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13726, 13738,
   13739, 13760, 13761, 13786, 13792, 13806, 13824, 13840, 13841, 13844,
-  13846, 13851, 13852, 13854, 13871, 13872, 13873, 13879, 13883, 13892,
-  13895, 13908, 13910, 13911, 13912, 13913, 13915, 13916, 13917, 13918,
-  13919, 13920, 13921, 13926, 13927, 13928, 13938, 13963, 13967, 13970,
-  13973
+  13846, 13851, 13852, 13854, 13871, 13872, 13873, 13879, 13883, 13886,
+  13892, 13895, 13908, 13910, 13911, 13912, 13913, 13915, 13916, 13917,
+  13918, 13919, 13920, 13921, 13926, 13927, 13928, 13938, 13963, 13967,
+  13970, 13973
 
 * ISO C11 support:
 
diff --git a/math/libm-test.inc b/math/libm-test.inc
index 94d60bff7e..e0ac6131da 100644
--- a/math/libm-test.inc
+++ b/math/libm-test.inc
@@ -3442,6 +3442,9 @@ floor_test (void)
   TEST_f_f (floor, 10141204801825835211973625643008.5L, 10141204801825835211973625643008.0L);
   TEST_f_f (floor, 10141204801825835211973625643008.75L, 10141204801825835211973625643008.0L);
   TEST_f_f (floor, 10141204801825835211973625643009.5L, 10141204801825835211973625643009.0L);
+
+  TEST_f_f (floor, 0xf.ffffffffffffff8p+47L, 0xf.fffffffffffep+47L);
+  TEST_f_f (floor, -0x8.000000000000004p+48L, -0x8.000000000001p+48L);
 #endif
 
   END (floor);
diff --git a/sysdeps/powerpc/fpu/libm-test-ulps b/sysdeps/powerpc/fpu/libm-test-ulps
index 1ab3d4ad4f..c555297db5 100644
--- a/sysdeps/powerpc/fpu/libm-test-ulps
+++ b/sysdeps/powerpc/fpu/libm-test-ulps
@@ -1488,6 +1488,17 @@ Test "log2 (e) == M_LOG2El":
 ildouble: 1
 ldouble: 1
 
+# pow
+Test "pow (0x0.ffffffp0, -0x1p24) == 2.7182819094701610539628664526874952929416":
+float: 1
+ifloat: 1
+Test "pow (0x0.ffffffp0, 0x1p24) == 0.3678794302077803437135155590023422899744":
+float: 1
+ifloat: 1
+Test "pow (0x1.000002p0, 0x1p24) == 7.3890552180866447284268641248075832310141":
+float: 1
+ifloat: 1
+
 # pow_downward
 Test "pow_downward (1.0625, 1.125) == 1.070582293028761362162622578677070098674":
 ildouble: 1
@@ -2448,6 +2459,8 @@ ildouble: 1
 ldouble: 1
 
 Function: "pow":
+float: 1
+ifloat: 1
 ildouble: 1
 ldouble: 1
 
diff --git a/sysdeps/powerpc/powerpc64/fpu/s_floorl.S b/sysdeps/powerpc/powerpc64/fpu/s_floorl.S
deleted file mode 100644
index 578be43756..0000000000
--- a/sysdeps/powerpc/powerpc64/fpu/s_floorl.S
+++ /dev/null
@@ -1,133 +0,0 @@
-/* long double floor function.
-   IBM extended format long double version.
-   Copyright (C) 2004, 2006 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-#include <math_ldbl_opt.h>
-
-	.section	".toc","aw"
-.LC0:	/* 2**52 */
-	.tc FD_43300000_0[TC],0x4330000000000000
-
-	.section	".text"
-/* long double [fp1,fp2] floorl (long double x [fp1,fp2])
-   IEEE 1003.1 floor function.
-
-   PowerPC64 long double uses the IBM extended format which is
-   represented two 64-floating point double values. The values are
-   non-overlapping giving an effective precision of 106 bits. The first
-   double contains the high order bits of mantisa and is always rounded
-   to represent a normal rounding of long double to double. Since the
-   long double value is sum of the high and low values, the low double
-   normally has the opposite sign to compensate for the this rounding.
-
-   For long double there are two cases:
-   1) |x| < 2**52, all the integer bits are in the high double.
-      floor the high double and set the low double to -0.0.
-   2) |x| >= 2**52, Rounding involves both doubles.
-      See the comment before lable .L2 for details.
-   */
-
-ENTRY (__floorl)
-	mffs	fp11		/* Save current FPU rounding mode.  */
-	lfd	fp13,.LC0@toc(2)
-	fabs	fp0,fp1
-	fabs	fp9,fp2
-	fsub	fp12,fp13,fp13	/* generate 0.0  */
-	fcmpu	cr7,fp0,fp13	/* if (fabs(x) > TWO52)  */
-	fcmpu	cr6,fp1,fp12	/* if (x > 0.0)  */
-	bnl-	cr7,.L2
-	mtfsfi	7,3		/* Set rounding mode toward -inf.  */
-	fneg	fp2,fp12	/* set low double to -0.0.  */
-	ble-	cr6,.L0
-	fadd	fp1,fp1,fp13	/* x+= TWO52;  */
-	fsub	fp1,fp1,fp13	/* x-= TWO52;  */
-	fcmpu	cr5,fp1,fp12	/* if (x > 0.0)  */
-	mtfsf	0x01,fp11	/* restore previous rounding mode.  */
-	bnelr+	cr5
-	fmr	fp1,fp12	/* x must be +0.0 for the 0.0 case.  */
-	blr
-.L0:
-	bge-	cr6,.L1		/* if (x < 0.0)  */
-	fsub	fp1,fp1,fp13	/* x-= TWO52;  */
-	fadd	fp1,fp1,fp13	/* x+= TWO52;  */
-.L1:
-	mtfsf	0x01,fp11	/* restore previous rounding mode.  */
-	blr
-	
-
-/* The high double is > TWO52 so we need to round the low double and
-   perhaps the high double.  In this case we have to round the low
-   double and handle any adjustment to the high double that may be
-   caused by rounding (up).  This is complicated by the fact that the
-   high double may already be rounded and the low double may have the
-   opposite sign to compensate.This gets a bit tricky so we use the
-   following algorithm:
-
-   tau = floor(x_high/TWO52);
-   x0 = x_high - tau;
-   x1 = x_low + tau;
-   r1 = rint(x1);
-   y_high = x0 + r1;
-   y_low = x0 - y_high + r1;
-   return y;  */
-.L2:
-	fcmpu	cr7,fp9,fp13	/* if (|x_low| > TWO52)  */
-	fcmpu	cr0,fp9,fp12	/* || (|x_low| == 0.0)  */
-	fcmpu	cr5,fp2,fp12	/* if (x_low > 0.0)  */
-	bgelr-	cr7		/*   return x;	*/
-	beqlr-  cr0
-	mtfsfi	7,3		/* Set rounding mode toward -inf.  */
-	fdiv	fp8,fp1,fp13	/* x_high/TWO52  */
-	
-	bng-	cr6,.L6		/* if (x > 0.0)  */
-	fctidz	fp0,fp8
-	fcfid	fp8,fp0		/* tau = floor(x_high/TWO52);  */
-	bng	cr5,.L4		/* if (x_low > 0.0)  */
-	fmr	fp3,fp1
-	fmr	fp4,fp2
-	b	.L5
-.L4:				/* if (x_low < 0.0)  */
-	fsub	fp3,fp1,fp8	/* x0 = x_high - tau;  */
-	fadd	fp4,fp2,fp8	/* x1 = x_low + tau;  */
-.L5:
-	fadd	fp5,fp4,fp13	/* r1 = r1 + TWO52;  */
-	fsub	fp5,fp5,fp13	/* r1 = r1 - TWO52;  */
-	b	.L9
-.L6:				/* if (x < 0.0)  */
-	fctidz	fp0,fp8
-	fcfid	fp8,fp0		/* tau = floor(x_high/TWO52);  */	
-	bnl	cr5,.L7		/* if (x_low < 0.0)  */
-	fmr	fp3,fp1
-	fmr	fp4,fp2
-	b	.L8
-.L7:				/* if (x_low > 0.0)  */
-	fsub	fp3,fp1,fp8	/* x0 = x_high - tau;  */
-	fadd	fp4,fp2,fp8	/* x1 = x_low + tau;  */
-.L8:
-	fsub	fp5,fp4,fp13	/* r1-= TWO52;  */
-	fadd	fp5,fp5,fp13	/* r1+= TWO52;  */
-.L9:
-	mtfsf	0x01,fp11	/* restore previous rounding mode.  */
-	fadd	fp1,fp3,fp5	/* y_high = x0 + r1;  */
-	fsub	fp2,fp3,fp1	/* y_low = x0 - y_high + r1;  */
-	fadd	fp2,fp2,fp5
-	blr
-END (__floorl)
-
-long_double_symbol (libm, __floorl, floorl)