From d489351c09c82994adb872049fcb33bf189f86af Mon Sep 17 00:00:00 2001
From: Stefan Liebler <stli@linux.vnet.ibm.com>
Date: Thu, 21 Apr 2016 12:42:49 +0200
Subject: [PATCH 06/14] S390: Optimize iso-8859-1 to ibm037 iconv-module.
This patch reworks the s390 specific module which used the z900
translate one to one instruction. Now the g5 translate instruction is used,
because it outperforms the troo instruction.
ChangeLog:
* sysdeps/s390/s390-64/iso-8859-1_cp037_z900.c (TROO_LOOP):
Rename to TR_LOOP and usage of tr instead of troo instruction.
---
sysdeps/s390/s390-64/iso-8859-1_cp037_z900.c | 93 +++++++++++++++++-----------
1 file changed, 56 insertions(+), 37 deletions(-)
@@ -1,7 +1,6 @@
/* Conversion between ISO 8859-1 and IBM037.
- This module uses the Z900 variant of the Translate One To One
- instruction.
+ This module uses the translate instruction.
Copyright (C) 1997-2016 Free Software Foundation, Inc.
Author: Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
@@ -176,50 +175,70 @@ __attribute__ ((aligned (8))) =
#define MIN_NEEDED_FROM 1
#define MIN_NEEDED_TO 1
-/* The Z900 variant of troo forces us to always specify a test
- character which ends the translation. So if we run into the
- situation where the translation has been interrupted due to the
- test character we translate the character by hand and jump back
- into the instruction. */
-
-#define TROO_LOOP(TABLE) \
+#define TR_LOOP(TABLE) \
{ \
- register const unsigned char test __asm__ ("0") = 0; \
- register const unsigned char *pTable __asm__ ("1") = TABLE; \
- register unsigned char *pOutput __asm__ ("2") = outptr; \
- register uint64_t length __asm__ ("3"); \
- const unsigned char* pInput = inptr; \
- uint64_t tmp; \
- \
- length = (inend - inptr < outend - outptr \
- ? inend - inptr : outend - outptr); \
+ size_t length = (inend - inptr < outend - outptr \
+ ? inend - inptr : outend - outptr); \
\
- __asm__ volatile ("0: \n\t" \
- " troo %0,%1 \n\t" \
- " jz 1f \n\t" \
- " jo 0b \n\t" \
- " llgc %3,0(%1) \n\t" \
- " la %3,0(%3,%4) \n\t" \
- " mvc 0(1,%0),0(%3) \n\t" \
- " aghi %1,1 \n\t" \
- " aghi %0,1 \n\t" \
- " aghi %2,-1 \n\t" \
- " j 0b \n\t" \
- "1: \n" \
+ /* Process in 256 byte blocks. */ \
+ if (__builtin_expect (length >= 256, 0)) \
+ { \
+ size_t blocks = length / 256; \
+ __asm__ __volatile__("0: mvc 0(256,%[R_OUT]),0(%[R_IN])\n\t" \
+ " tr 0(256,%[R_OUT]),0(%[R_TBL])\n\t" \
+ " la %[R_IN],256(%[R_IN])\n\t" \
+ " la %[R_OUT],256(%[R_OUT])\n\t" \
+ " brctg %[R_LI],0b\n\t" \
+ : /* outputs */ [R_IN] "+a" (inptr) \
+ , [R_OUT] "+a" (outptr), [R_LI] "+d" (blocks) \
+ : /* inputs */ [R_TBL] "a" (TABLE) \
+ : /* clobber list */ "memory" \
+ ); \
+ length = length % 256; \
+ } \
\
- : "+a" (pOutput), "+a" (pInput), "+d" (length), "=&a" (tmp) \
- : "a" (pTable), "d" (test) \
- : "cc"); \
+ /* Process remaining 0...248 bytes in 8byte blocks. */ \
+ if (length >= 8) \
+ { \
+ size_t blocks = length / 8; \
+ for (int i = 0; i < blocks; i++) \
+ { \
+ outptr[0] = TABLE[inptr[0]]; \
+ outptr[1] = TABLE[inptr[1]]; \
+ outptr[2] = TABLE[inptr[2]]; \
+ outptr[3] = TABLE[inptr[3]]; \
+ outptr[4] = TABLE[inptr[4]]; \
+ outptr[5] = TABLE[inptr[5]]; \
+ outptr[6] = TABLE[inptr[6]]; \
+ outptr[7] = TABLE[inptr[7]]; \
+ inptr += 8; \
+ outptr += 8; \
+ } \
+ length = length % 8; \
+ } \
\
- inptr = pInput; \
- outptr = pOutput; \
+ /* Process remaining 0...7 bytes. */ \
+ switch (length) \
+ { \
+ case 7: outptr[6] = TABLE[inptr[6]]; \
+ case 6: outptr[5] = TABLE[inptr[5]]; \
+ case 5: outptr[4] = TABLE[inptr[4]]; \
+ case 4: outptr[3] = TABLE[inptr[3]]; \
+ case 3: outptr[2] = TABLE[inptr[2]]; \
+ case 2: outptr[1] = TABLE[inptr[1]]; \
+ case 1: outptr[0] = TABLE[inptr[0]]; \
+ case 0: break; \
+ } \
+ inptr += length; \
+ outptr += length; \
}
+
/* First define the conversion function from ISO 8859-1 to CP037. */
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define LOOPFCT FROM_LOOP
-#define BODY TROO_LOOP (table_iso8859_1_to_cp037)
+#define BODY TR_LOOP (table_iso8859_1_to_cp037)
#include <iconv/loop.c>
@@ -228,7 +247,7 @@ __attribute__ ((aligned (8))) =
#define MIN_NEEDED_INPUT MIN_NEEDED_TO
#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM
#define LOOPFCT TO_LOOP
-#define BODY TROO_LOOP (table_cp037_iso8859_1);
+#define BODY TR_LOOP (table_cp037_iso8859_1);
#include <iconv/loop.c>
--
2.5.5