File 0007-S390-Use-cu41-instruction-for-converting-f... of Package glibc-utils

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File 0007-S390-Use-cu41-instruction-for-converting-from-utf32-.patch of Package glibc-utils (Revision d0f49042a052d803641ce54ae37aa23a)

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From 17c8b69b084e8d171ac16f57377f843e7edaa0d1 Mon Sep 17 00:00:00 2001
From: Stefan Liebler <stli@linux.vnet.ibm.com>
Date: Thu, 27 Jul 2017 10:53:58 +0200
Subject: [PATCH 07/11] S390: Use cu41 instruction for converting from utf32 to
 utf8.

upstream-commit 23ea69a9d6e9ab28c66a232b767a800b04eaa938

This patch adds an ifunc variant to use the cu instruction on arch12 CPUs.
This new ifunc variant can be built if binutils support z13 vector
instructions.  At runtime, HWCAP_S390_VXE decides if we can use the
cu41 instruction.

ChangeLog:

* sysdeps/s390/utf8-utf32-z9.c (__to_utf8_loop_vx_cu):
	Use vector and cu41 instruction.
	* sysdeps/s390/multiarch/utf8-utf32-z9.c: Add __to_utf8_loop_vx_cu
	in ifunc resolver.
---
 sysdeps/s390/multiarch/utf8-utf32-z9.c |   8 ++-
 sysdeps/s390/utf8-utf32-z9.c           | 112 +++++++++++++++++++++++++++++++++
 2 files changed, 117 insertions(+), 3 deletions(-)

Index: glibc-2.22/sysdeps/s390/multiarch/utf8-utf32-z9.c
===================================================================
--- glibc-2.22.orig/sysdeps/s390/multiarch/utf8-utf32-z9.c
+++ glibc-2.22/sysdeps/s390/multiarch/utf8-utf32-z9.c
@@ -41,8 +41,10 @@ s390_libc_ifunc_expr (FROM_LOOP_DEFAULT,
 			: FROM_LOOP_DEFAULT);
 
 s390_libc_ifunc_expr (TO_LOOP_DEFAULT, TO_LOOP,
-		      (HAVE_TO_VX && (hwcap & HWCAP_S390_VX))
-		      ? TO_LOOP_VX
-		      : TO_LOOP_DEFAULT);
+		      (HAVE_TO_VX_CU && (hwcap & HWCAP_S390_VXE))
+		      ? TO_LOOP_VX_CU
+		      : (HAVE_TO_VX && (hwcap & HWCAP_S390_VX))
+			? TO_LOOP_VX
+			: TO_LOOP_DEFAULT);
 
 #include <iconv/skeleton.c>
Index: glibc-2.22/sysdeps/s390/utf8-utf32-z9.c
===================================================================
--- glibc-2.22.orig/sysdeps/s390/utf8-utf32-z9.c
+++ glibc-2.22/sysdeps/s390/utf8-utf32-z9.c
@@ -52,9 +52,11 @@
 #if defined HAVE_S390_VX_ASM_SUPPORT && defined USE_MULTIARCH
 # define HAVE_FROM_VX		1
 # define HAVE_TO_VX		1
+# define HAVE_TO_VX_CU		1
 #else
 # define HAVE_FROM_VX		0
 # define HAVE_TO_VX		0
+# define HAVE_TO_VX_CU		0
 #endif
 
 #if defined HAVE_S390_VX_GCC_SUPPORT
@@ -863,6 +865,116 @@ gconv_end (struct __gconv_step *data)
 # define TO_LOOP_VX		NULL
 #endif /* HAVE_TO_VX != 1  */
 
+#if HAVE_TO_VX_CU == 1
+#define BODY_TO_VX_CU							\
+  {									\
+    register const unsigned char* pInput asm ("8") = inptr;		\
+    register size_t inlen asm ("9") = inend - inptr;			\
+    register unsigned char* pOutput asm ("10") = outptr;		\
+    register size_t outlen asm ("11") = outend - outptr;		\
+    unsigned long tmp, tmp2;						\
+    asm volatile (".machine push\n\t"					\
+		  ".machine \"z13\"\n\t"				\
+		  ".machinemode \"zarch_nohighgprs\"\n\t"		\
+		  "    vleif %%v20,127,0\n\t"   /* element 0: 127  */	\
+		  "    vzero %%v21\n\t"					\
+		  "    vleih %%v21,8192,0\n\t"  /* element 0:   >  */	\
+		  "    vleih %%v21,-8192,2\n\t" /* element 1: =<>  */	\
+		  CONVERT_32BIT_SIZE_T ([R_INLEN])			\
+		  CONVERT_32BIT_SIZE_T ([R_OUTLEN])			\
+		  /* Loop which handles UTF-32 chars <= 0x7f.  */	\
+		  "0:  clgijl %[R_INLEN],64,20f\n\t"			\
+		  "    clgijl %[R_OUTLEN],16,20f\n\t"			\
+		  "1:  vlm %%v16,%%v19,0(%[R_IN])\n\t"			\
+		  "    lghi %[R_TMP],0\n\t"				\
+		  /* Shorten to byte values.  */			\
+		  "    vpkf %%v23,%%v16,%%v17\n\t"			\
+		  "    vpkf %%v24,%%v18,%%v19\n\t"			\
+		  "    vpkh %%v23,%%v23,%%v24\n\t"			\
+		  /* Checking for values > 0x7f.  */			\
+		  "    vstrcfs %%v22,%%v16,%%v20,%%v21\n\t"		\
+		  "    jno 10f\n\t"					\
+		  "    vstrcfs %%v22,%%v17,%%v20,%%v21\n\t"		\
+		  "    jno 11f\n\t"					\
+		  "    vstrcfs %%v22,%%v18,%%v20,%%v21\n\t"		\
+		  "    jno 12f\n\t"					\
+		  "    vstrcfs %%v22,%%v19,%%v20,%%v21\n\t"		\
+		  "    jno 13f\n\t"					\
+		  /* Store 16bytes to outptr.  */			\
+		  "    vst %%v23,0(%[R_OUT])\n\t"			\
+		  "    aghi %[R_INLEN],-64\n\t"				\
+		  "    aghi %[R_OUTLEN],-16\n\t"			\
+		  "    la %[R_IN],64(%[R_IN])\n\t"			\
+		  "    la %[R_OUT],16(%[R_OUT])\n\t"			\
+		  "    clgijl %[R_INLEN],64,20f\n\t"			\
+		  "    clgijl %[R_OUTLEN],16,20f\n\t"			\
+		  "    j 1b\n\t"					\
+		  /* Found a value > 0x7f.  */				\
+		  "13: ahi %[R_TMP],4\n\t"				\
+		  "12: ahi %[R_TMP],4\n\t"				\
+		  "11: ahi %[R_TMP],4\n\t"				\
+		  "10: vlgvb %[R_I],%%v22,7\n\t"			\
+		  "    srlg %[R_I],%[R_I],2\n\t"			\
+		  "    agr %[R_I],%[R_TMP]\n\t"				\
+		  "    je 20f\n\t"					\
+		  /* Store characters before invalid one...  */		\
+		  "    slgr %[R_OUTLEN],%[R_I]\n\t"			\
+		  "15: aghi %[R_I],-1\n\t"				\
+		  "    vstl %%v23,%[R_I],0(%[R_OUT])\n\t"		\
+		  /* ... and update pointers.  */			\
+		  "    aghi %[R_I],1\n\t"				\
+		  "    la %[R_OUT],0(%[R_I],%[R_OUT])\n\t"		\
+		  "    sllg %[R_I],%[R_I],2\n\t"			\
+		  "    la %[R_IN],0(%[R_I],%[R_IN])\n\t"		\
+		  "    slgr %[R_INLEN],%[R_I]\n\t"			\
+		  /* Handle multibyte utf8-char with convert instruction. */ \
+		  "20: cu41 %[R_OUT],%[R_IN]\n\t"			\
+		  "    jo 0b\n\t" /* Try vector implemenation again.  */ \
+		  "    lochil %[R_RES],%[RES_OUT_FULL]\n\t" /* cc == 1.  */ \
+		  "    lochih %[R_RES],%[RES_IN_ILL]\n\t" /* cc == 2.  */ \
+		  ".machine pop"					\
+		  : /* outputs */ [R_IN] "+a" (pInput)			\
+		    , [R_INLEN] "+d" (inlen), [R_OUT] "+a" (pOutput)	\
+		    , [R_OUTLEN] "+d" (outlen), [R_TMP] "=d" (tmp)	\
+		    , [R_I] "=a" (tmp2)					\
+		    , [R_RES] "+d" (result)				\
+		  : /* inputs */					\
+		    [RES_OUT_FULL] "i" (__GCONV_FULL_OUTPUT)		\
+		    , [RES_IN_ILL] "i" (__GCONV_ILLEGAL_INPUT)		\
+		  : /* clobber list */ "memory", "cc"			\
+		    ASM_CLOBBER_VR ("v16") ASM_CLOBBER_VR ("v17")	\
+		    ASM_CLOBBER_VR ("v18") ASM_CLOBBER_VR ("v19")	\
+		    ASM_CLOBBER_VR ("v20") ASM_CLOBBER_VR ("v21")	\
+		    ASM_CLOBBER_VR ("v22") ASM_CLOBBER_VR ("v23")	\
+		    ASM_CLOBBER_VR ("v24")				\
+		  );							\
+    inptr = pInput;							\
+    outptr = pOutput;							\
+									\
+    if (__glibc_likely (inptr == inend)					\
+	|| result == __GCONV_FULL_OUTPUT)				\
+      break;								\
+    if (inptr + 4 > inend)						\
+      {									\
+	result = __GCONV_INCOMPLETE_INPUT;				\
+	break;								\
+      }									\
+    STANDARD_TO_LOOP_ERR_HANDLER (4);					\
+  }
+
+/* Generate loop-function with hardware vector and utf-convert instructions.  */
+# define MIN_NEEDED_INPUT	MIN_NEEDED_TO
+# define MIN_NEEDED_OUTPUT	MIN_NEEDED_FROM
+# define MAX_NEEDED_OUTPUT	MAX_NEEDED_FROM
+# define TO_LOOP_VX_CU		__to_utf8_loop_vx_cu
+# define LOOPFCT		TO_LOOP_VX_CU
+# define BODY			BODY_TO_VX_CU
+# define LOOP_NEED_FLAGS
+# include <iconv/loop.c>
+#else
+# define TO_LOOP_VX_CU		NULL
+#endif /* HAVE_TO_VX_CU != 1  */
+
 /* This file also exists in sysdeps/s390/multiarch/ which
    generates ifunc resolvers for FROM/TO_LOOP functions
    and includes iconv/skeleton.c afterwards.  */

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File 0007-S390-Use-cu41-instruction-for-converting-from-utf32-.patch of Package glibc-utils (Revision d0f49042a052d803641ce54ae37aa23a)

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