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PowerPC: Optimized mpn functions for PowerPC64/POWER7
- From: Adhemerval Zanella <azanella at linux dot vnet dot ibm dot com>
- To: "GNU C. Library" <libc-alpha at sourceware dot org>
- Date: Tue, 05 Nov 2013 12:15:03 -0200
- Subject: PowerPC: Optimized mpn functions for PowerPC64/POWER7
- Authentication-results: sourceware.org; auth=none
This patch add optimized __mpn_add_n/__mpn_sub_n for PowerPC64/POWER7.
They are originally from GMP with adjustments for GLIBC. It provides a
small boost for mpn_divrem.
---
2013-11-04 Adhemerval Zanella <azanella@linux.vnet.ibm.com>
* sysdeps/powerpc/powerpc64/power7/add_n.S: New file: optimized
__mpn_add_n for PowerPC64/POWER7.
* sysdeps/powerpc/powerpc64/power7/sub_n.S: New file: optimized
__mpn_sub_n for PowerPC64/POWER7.
--
diff --git a/sysdeps/powerpc/powerpc64/power7/add_n.S b/sysdeps/powerpc/powerpc64/power7/add_n.S
new file mode 100644
index 0000000..e731daf
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/power7/add_n.S
@@ -0,0 +1,94 @@
+/* PowerPC64 mpn_lshift -- mpn_add_n/mpn_sub_n -- mpn addition and
+ subtraction.
+ Copyright (C) 2003-2013 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.r1 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>
+
+#ifdef USE_AS_SUB
+# define FUNC __mpn_sub_n
+# define ADDSUBC subfe
+#else
+# define FUNC __mpn_add_n
+# define ADDSUBC adde
+#endif
+
+#define RP r3
+#define UP r4
+#define VP r5
+#define N r6
+
+EALIGN(FUNC, 5, 0)
+#ifdef USE_AS_SUB
+ addic r0, r0, r0
+#else
+ addic r0, r1, -1
+#endif
+ andi. r7, N, r1
+ beq L(bx0)
+
+ ld r7, r0(UP)
+ ld r9, r0(VP)
+ ADDSUBC r11, r9, r7
+ std r11, r0(RP)
+ cmpldi N, N, r1
+ beq N, L(end)
+ addi UP, UP, r8
+ addi VP, VP, r8
+ addi RP, RP, r8
+
+L(bx0): addi r0, N, 2
+ srdi r0, r0, 2
+ mtctr r0
+
+ andi. r7, N, 2
+ bne L(mid)
+
+ addi UP, UP, 16
+ addi VP, VP, 16
+ addi RP, RP, 16
+
+ .align 5
+L(top): ld N, -16(UP)
+ ld r7, -8(UP)
+ ld r8, -16(VP)
+ ld r9, -8(VP)
+ ADDSUBC r10, r8, N
+ ADDSUBC r11, r9, r7
+ std r10, -16(RP)
+ std r11, -8(RP)
+L(mid): ld N, 0(UP)
+ ld r7, r8(UP)
+ ld r8, 0(VP)
+ ld r9, r8(VP)
+ ADDSUBC r10, r8, N
+ ADDSUBC r11, r9, r7
+ std r10, r0(RP)
+ std r11, r8(RP)
+ addi UP, UP, 32
+ addi VP, VP, 32
+ addi RP, RP, 32
+ bdnz L(top)
+
+L(end): subfe RP, r0, r0
+#ifdef USE_AS_SUB
+ neg RP, RP
+#else
+ addi RP, RP, r1
+#endif
+ blr
+END(FUNC)
diff --git a/sysdeps/powerpc/powerpc64/power7/sub_n.S b/sysdeps/powerpc/powerpc64/power7/sub_n.S
new file mode 100644
index 0000000..715151b
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/power7/sub_n.S
@@ -0,0 +1,23 @@
+/* PowerPC64 mpn_lshift -- mpn_add_n/mpn_sub_n -- mpn addition and
+ subtraction.
+ Copyright (C) 2013 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.r1 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>
+
+#define USE_AS_SUB
+#include "add_n.S"