path: root/sysdeps/s390/utf8-utf32-z9.c

/* Conversion between UTF-8 and UTF-32 BE/internal.

   This module uses the Z9-109 variants of the Convert Unicode
   instructions.
   Copyright (C) 1997-2017 Free Software Foundation, Inc.

   Author: Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
   Based on the work by Ulrich Drepper  <drepper@cygnus.com>, 1997.

   Thanks to Daniel Appich who covered the relevant performance work
   in his diploma thesis.

   This 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.

   This 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 <dlfcn.h>
#include <stdint.h>
#include <unistd.h>
#include <gconv.h>
#include <string.h>

/* Select which versions should be defined depending on support
   for multiarch, vector and used minimum architecture level.  */
#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
# define HAVE_FROM_C		0
# define FROM_LOOP_DEFAULT	FROM_LOOP_CU
#else
# define HAVE_FROM_C		1
# define FROM_LOOP_DEFAULT	FROM_LOOP_C
#endif

#define HAVE_TO_C		1
#define TO_LOOP_DEFAULT		TO_LOOP_C

#if defined HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT || defined USE_MULTIARCH
# define HAVE_FROM_CU		1
#else
# define HAVE_FROM_CU		0
#endif

#if defined HAVE_S390_VX_ASM_SUPPORT && defined USE_MULTIARCH
# define HAVE_FROM_VX		1
# define HAVE_TO_VX		1
#else
# define HAVE_FROM_VX		0
# define HAVE_TO_VX		0
#endif

#if defined HAVE_S390_VX_GCC_SUPPORT
# define ASM_CLOBBER_VR(NR) , NR
#else
# define ASM_CLOBBER_VR(NR)
#endif

#if defined __s390x__
# define CONVERT_32BIT_SIZE_T(REG)
#else
# define CONVERT_32BIT_SIZE_T(REG) "llgfr %" #REG ",%" #REG "\n\t"
#endif

/* Defines for skeleton.c.  */
#define DEFINE_INIT		0
#define DEFINE_FINI		0
#define MIN_NEEDED_FROM		1
#define MAX_NEEDED_FROM		6
#define MIN_NEEDED_TO		4
#define FROM_LOOP		FROM_LOOP_DEFAULT
#define TO_LOOP			TO_LOOP_DEFAULT
#define FROM_DIRECTION		(dir == from_utf8)
#define ONE_DIRECTION           0

/* UTF-32 big endian byte order mark.  */
#define BOM			0x0000feffu

/* Direction of the transformation.  */
enum direction
{
  illegal_dir,
  to_utf8,
  from_utf8
};

struct utf8_data
{
  enum direction dir;
  int emit_bom;
};


extern int gconv_init (struct __gconv_step *step);
int
gconv_init (struct __gconv_step *step)
{
  /* Determine which direction.  */
  struct utf8_data *new_data;
  enum direction dir = illegal_dir;
  int emit_bom;
  int result;

  emit_bom = (__strcasecmp (step->__to_name, "UTF-32//") == 0);

  if (__strcasecmp (step->__from_name, "ISO-10646/UTF8/") == 0
      && (__strcasecmp (step->__to_name, "UTF-32//") == 0
	  || __strcasecmp (step->__to_name, "UTF-32BE//") == 0
	  || __strcasecmp (step->__to_name, "INTERNAL") == 0))
    {
      dir = from_utf8;
    }
  else if (__strcasecmp (step->__to_name, "ISO-10646/UTF8/") == 0
	   && (__strcasecmp (step->__from_name, "UTF-32BE//") == 0
	       || __strcasecmp (step->__from_name, "INTERNAL") == 0))
    {
      dir = to_utf8;
    }

  result = __GCONV_NOCONV;
  if (dir != illegal_dir)
    {
      new_data = (struct utf8_data *) malloc (sizeof (struct utf8_data));

      result = __GCONV_NOMEM;
      if (new_data != NULL)
	{
	  new_data->dir = dir;
	  new_data->emit_bom = emit_bom;
	  step->__data = new_data;

	  if (dir == from_utf8)
	    {
	      step->__min_needed_from = MIN_NEEDED_FROM;
	      step->__max_needed_from = MIN_NEEDED_FROM;
	      step->__min_needed_to = MIN_NEEDED_TO;
	      step->__max_needed_to = MIN_NEEDED_TO;
	    }
	  else
	    {
	      step->__min_needed_from = MIN_NEEDED_TO;
	      step->__max_needed_from = MIN_NEEDED_TO;
	      step->__min_needed_to = MIN_NEEDED_FROM;
	      step->__max_needed_to = MIN_NEEDED_FROM;
	    }

	  step->__stateful = 0;

	  result = __GCONV_OK;
	}
    }

  return result;
}


extern void gconv_end (struct __gconv_step *data);
void
gconv_end (struct __gconv_step *data)
{
  free (data->__data);
}

/* The macro for the hardware loop.  This is used for both
   directions.  */
#define HARDWARE_CONVERT(INSTRUCTION)					\
  {									\
    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 cc = 0;						\
									\
    __asm__ __volatile__ (".machine push       \n\t"			\
			  ".machine \"z9-109\" \n\t"			\
			  ".machinemode \"zarch_nohighgprs\"\n\t"	\
			  "0: " INSTRUCTION "  \n\t"			\
			  ".machine pop        \n\t"			\
			  "   jo     0b        \n\t"			\
			  "   ipm    %2        \n"			\
			  : "+a" (pOutput), "+a" (pInput), "+d" (cc),	\
			    "+d" (outlen), "+d" (inlen)			\
			  :						\
			  : "cc", "memory");				\
									\
    inptr = pInput;							\
    outptr = pOutput;							\
    cc >>= 28;								\
									\
    if (cc == 1)							\
      {									\
	result = __GCONV_FULL_OUTPUT;					\
      }									\
    else if (cc == 2)							\
      {									\
	result = __GCONV_ILLEGAL_INPUT;					\
      }									\
  }

#define PREPARE_LOOP							\
  enum direction dir = ((struct utf8_data *) step->__data)->dir;	\
  int emit_bom = ((struct utf8_data *) step->__data)->emit_bom;		\
									\
  if (emit_bom && !data->__internal_use					\
      && data->__invocation_counter == 0)				\
    {									\
      /* Emit the Byte Order Mark.  */					\
      if (__glibc_unlikely (outbuf + 4 > outend))			\
	return __GCONV_FULL_OUTPUT;					\
									\
      put32u (outbuf, BOM);						\
      outbuf += 4;							\
    }

/* Conversion function from UTF-8 to UTF-32 internal/BE.  */

#define STORE_REST_COMMON						      \
  {									      \
    /* We store the remaining bytes while converting them into the UCS4	      \
       format.  We can assume that the first byte in the buffer is	      \
       correct and that it requires a larger number of bytes than there	      \
       are in the input buffer.  */					      \
    wint_t ch = **inptrp;						      \
    size_t cnt, r;							      \
									      \
    state->__count = inend - *inptrp;					      \
									      \
    assert (ch != 0xc0 && ch != 0xc1);					      \
    if (ch >= 0xc2 && ch < 0xe0)					      \
      {									      \
	/* We expect two bytes.  The first byte cannot be 0xc0 or	      \
	   0xc1, otherwise the wide character could have been		      \
	   represented using a single byte.  */				      \
	cnt = 2;							      \
	ch &= 0x1f;							      \
      }									      \
    else if (__glibc_likely ((ch & 0xf0) == 0xe0))			      \
      {									      \
	/* We expect three bytes.  */					      \
	cnt = 3;							      \
	ch &= 0x0f;							      \
      }									      \
    else if (__glibc_likely ((ch & 0xf8) == 0xf0))			      \
      {									      \
	/* We expect four bytes.  */					      \
	cnt = 4;							      \
	ch &= 0x07;							      \
      }									      \
    else if (__glibc_likely ((ch & 0xfc) == 0xf8))			      \
      {									      \
	/* We expect five bytes.  */					      \
	cnt = 5;							      \
	ch &= 0x03;							      \
      }									      \
    else								      \
      {									      \
	/* We expect six bytes.  */					      \
	cnt = 6;							      \
	ch &= 0x01;							      \
      }									      \
									      \
    /* The first byte is already consumed.  */				      \
    r = cnt - 1;							      \
    while (++(*inptrp) < inend)						      \
      {									      \
	ch <<= 6;							      \
	ch |= **inptrp & 0x3f;						      \
	--r;								      \
      }									      \
									      \
    /* Shift for the so far missing bytes.  */				      \
    ch <<= r * 6;							      \
									      \
    /* Store the number of bytes expected for the entire sequence.  */	      \
    state->__count |= cnt << 8;						      \
									      \
    /* Store the value.  */						      \
    state->__value.__wch = ch;						      \
  }

#define UNPACK_BYTES_COMMON \
  {									      \
    static const unsigned char inmask[5] = { 0xc0, 0xe0, 0xf0, 0xf8, 0xfc };  \
    wint_t wch = state->__value.__wch;					      \
    size_t ntotal = state->__count >> 8;				      \
									      \
    inlen = state->__count & 255;					      \
									      \
    bytebuf[0] = inmask[ntotal - 2];					      \
									      \
    do									      \
      {									      \
	if (--ntotal < inlen)						      \
	  bytebuf[ntotal] = 0x80 | (wch & 0x3f);			      \
	wch >>= 6;							      \
      }									      \
    while (ntotal > 1);							      \
									      \
    bytebuf[0] |= wch;							      \
  }

#define CLEAR_STATE_COMMON \
  state->__count = 0

#define BODY_FROM_HW(ASM)						\
  {									\
    ASM;								\
    if (__glibc_likely (inptr == inend)					\
	|| result == __GCONV_FULL_OUTPUT)				\
      break;								\
									\
    int i;								\
    for (i = 1; inptr + i < inend && i < 5; ++i)			\
      if ((inptr[i] & 0xc0) != 0x80)					\
	break;								\
									\
    if (__glibc_likely (inptr + i == inend				\
			&& result == __GCONV_EMPTY_INPUT))		\
      {									\
	result = __GCONV_INCOMPLETE_INPUT;				\
	break;								\
      }									\
    STANDARD_FROM_LOOP_ERR_HANDLER (i);					\
  }

#if HAVE_FROM_C == 1
/* The software routine is copied from gconv_simple.c.  */
# define BODY_FROM_C							\
  {									\
    /* Next input byte.  */						\
    uint32_t ch = *inptr;						\
									\
    if (__glibc_likely (ch < 0x80))					\
      {									\
	/* One byte sequence.  */					\
	++inptr;							\
      }									\
    else								\
      {									\
	uint_fast32_t cnt;						\
	uint_fast32_t i;						\
									\
	if (ch >= 0xc2 && ch < 0xe0)					\
	  {								\
	    /* We expect two bytes.  The first byte cannot be 0xc0 or	\
	       0xc1, otherwise the wide character could have been	\
	       represented using a single byte.  */			\
	    cnt = 2;							\
	    ch &= 0x1f;							\
	  }								\
	else if (__glibc_likely ((ch & 0xf0) == 0xe0))			\
	  {								\
	    /* We expect three bytes.  */				\
	    cnt = 3;							\
	    ch &= 0x0f;							\
	  }								\
	else if (__glibc_likely ((ch & 0xf8) == 0xf0))			\
	  {								\
	    /* We expect four bytes.  */				\
	    cnt = 4;							\
	    ch &= 0x07;							\
	  }								\
	else								\
	  {								\
	    /* Search the end of this ill-formed UTF-8 character.  This	\
	       is the next byte with (x & 0xc0) != 0x80.  */		\
	    i = 0;							\
	    do								\
	      ++i;							\
	    while (inptr + i < inend					\
		   && (*(inptr + i) & 0xc0) == 0x80			\
		   && i < 5);						\
									\
	  errout:							\
	    STANDARD_FROM_LOOP_ERR_HANDLER (i);				\
	  }								\
									\
	if (__glibc_unlikely (inptr + cnt > inend))			\
	  {								\
	    /* We don't have enough input.  But before we report	\
	       that check that all the bytes are correct.  */		\
	    for (i = 1; inptr + i < inend; ++i)				\
	      if ((inptr[i] & 0xc0) != 0x80)				\
		break;							\
									\
	    if (__glibc_likely (inptr + i == inend))			\
	      {								\
		result = __GCONV_INCOMPLETE_INPUT;			\
		break;							\
	      }								\
									\
	    goto errout;						\
	  }								\
									\
	/* Read the possible remaining bytes.  */			\
	for (i = 1; i < cnt; ++i)					\
	  {								\
	    uint32_t byte = inptr[i];					\
									\
	    if ((byte & 0xc0) != 0x80)					\
	      /* This is an illegal encoding.  */			\
	      break;							\
									\
	    ch <<= 6;							\
	    ch |= byte & 0x3f;						\
	  }								\
									\
	/* If i < cnt, some trail byte was not >= 0x80, < 0xc0.		\
	   If cnt > 2 and ch < 2^(5*cnt-4), the wide character ch could	\
	   have been represented with fewer than cnt bytes.  */		\
	if (i < cnt || (cnt > 2 && (ch >> (5 * cnt - 4)) == 0)		\
	    /* Do not accept UTF-16 surrogates.  */			\
	    || (ch >= 0xd800 && ch <= 0xdfff)				\
	    || (ch > 0x10ffff))						\
	  {								\
	    /* This is an illegal encoding.  */				\
	    goto errout;						\
	  }								\
									\
	inptr += cnt;							\
      }									\
									\
    /* Now adjust the pointers and store the result.  */		\
    *((uint32_t *) outptr) = ch;					\
    outptr += sizeof (uint32_t);					\
  }

/* These definitions apply to the UTF-8 to UTF-32 direction.  The
   software implementation for UTF-8 still supports multibyte
   characters up to 6 bytes whereas the hardware variant does not.  */
# define MIN_NEEDED_INPUT	MIN_NEEDED_FROM
# define MAX_NEEDED_INPUT	MAX_NEEDED_FROM
# define MIN_NEEDED_OUTPUT	MIN_NEEDED_TO
# define FROM_LOOP_C		__from_utf8_loop_c
# define LOOPFCT		FROM_LOOP_C

# define LOOP_NEED_FLAGS

# define STORE_REST		STORE_REST_COMMON
# define UNPACK_BYTES		UNPACK_BYTES_COMMON
# define CLEAR_STATE		CLEAR_STATE_COMMON
# define BODY			BODY_FROM_C
# include <iconv/loop.c>
#else
# define FROM_LOOP_C		NULL
#endif /* HAVE_FROM_C != 1  */

#if HAVE_FROM_CU == 1
/* This hardware routine uses the Convert UTF8 to UTF32 (cu14) instruction.  */
# define BODY_FROM_ETF3EH BODY_FROM_HW (HARDWARE_CONVERT ("cu14 %0, %1, 1"))

/* Generate loop-function with hardware utf-convert instruction.  */
# define MIN_NEEDED_INPUT	MIN_NEEDED_FROM
# define MAX_NEEDED_INPUT	MAX_NEEDED_FROM
# define MIN_NEEDED_OUTPUT	MIN_NEEDED_TO
# define FROM_LOOP_CU		__from_utf8_loop_etf3eh
# define LOOPFCT		FROM_LOOP_CU

# define LOOP_NEED_FLAGS

# define STORE_REST		STORE_REST_COMMON
# define UNPACK_BYTES		UNPACK_BYTES_COMMON
# define CLEAR_STATE		CLEAR_STATE_COMMON
# define BODY			BODY_FROM_ETF3EH
# include <iconv/loop.c>
#else
# define FROM_LOOP_CU		NULL
#endif /* HAVE_FROM_CU != 1  */

#if HAVE_FROM_VX == 1
# define HW_FROM_VX							\
  {									\
    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, tmp3;					\
    asm volatile (".machine push\n\t"					\
		  ".machine \"z13\"\n\t"				\
		  ".machinemode \"zarch_nohighgprs\"\n\t"		\
		  "    vrepib %%v30,0x7f\n\t" /* For compare > 0x7f.  */ \
		  "    vrepib %%v31,0x20\n\t"				\
		  CONVERT_32BIT_SIZE_T ([R_INLEN])			\
		  CONVERT_32BIT_SIZE_T ([R_OUTLEN])			\
		  /* Loop which handles UTF-8 chars <=0x7f.  */		\
		  "0:  clgijl %[R_INLEN],16,20f\n\t"			\
		  "    clgijl %[R_OUTLEN],64,20f\n\t"			\
		  "1: vl %%v16,0(%[R_IN])\n\t"				\
		  "    vstrcbs %%v17,%%v16,%%v30,%%v31\n\t"		\
		  "    jno 10f\n\t" /* Jump away if not all bytes are 1byte \
				   UTF8 chars.  */			\
		  /* Enlarge to UCS4.  */				\
		  "    vuplhb %%v18,%%v16\n\t"				\
		  "    vupllb %%v19,%%v16\n\t"				\
		  "    la %[R_IN],16(%[R_IN])\n\t"			\
		  "    vuplhh %%v20,%%v18\n\t"				\
		  "    aghi %[R_INLEN],-16\n\t"				\
		  "    vupllh %%v21,%%v18\n\t"				\
		  "    aghi %[R_OUTLEN],-64\n\t"			\
		  "    vuplhh %%v22,%%v19\n\t"				\
		  "    vupllh %%v23,%%v19\n\t"				\
		  /* Store 64 bytes to buf_out.  */			\
		  "    vstm %%v20,%%v23,0(%[R_OUT])\n\t"		\
		  "    la %[R_OUT],64(%[R_OUT])\n\t"			\
		  "    clgijl %[R_INLEN],16,20f\n\t"			\
		  "    clgijl %[R_OUTLEN],64,20f\n\t"			\
		  "    j 1b\n\t"					\
		  "10: \n\t"						\
		  /* At least one byte is > 0x7f.			\
		     Store the preceding 1-byte chars.  */		\
		  "    vlgvb %[R_TMP],%%v17,7\n\t"			\
		  "    sllk %[R_TMP2],%[R_TMP],2\n\t" /* Compute highest \
						     index to store. */ \
		  "    llgfr %[R_TMP3],%[R_TMP2]\n\t"			\
		  "    ahi %[R_TMP2],-1\n\t"				\
		  "    jl 20f\n\t"					\
		  "    vuplhb %%v18,%%v16\n\t"				\
		  "    vuplhh %%v20,%%v18\n\t"				\
		  "    vstl %%v20,%[R_TMP2],0(%[R_OUT])\n\t"		\
		  "    ahi %[R_TMP2],-16\n\t"				\
		  "    jl 11f\n\t"					\
		  "    vupllh %%v21,%%v18\n\t"				\
		  "    vstl %%v21,%[R_TMP2],16(%[R_OUT])\n\t"		\
		  "    ahi %[R_TMP2],-16\n\t"				\
		  "    jl 11f\n\t"					\
		  "    vupllb %%v19,%%v16\n\t"				\
		  "    vuplhh %%v22,%%v19\n\t"				\
		  "    vstl %%v22,%[R_TMP2],32(%[R_OUT])\n\t"		\
		  "    ahi %[R_TMP2],-16\n\t"				\
		  "    jl 11f\n\t"					\
		  "    vupllh %%v23,%%v19\n\t"				\
		  "    vstl %%v23,%[R_TMP2],48(%[R_OUT])\n\t"		\
		  "11: \n\t"						\
		  /* Update pointers.  */				\
		  "    la %[R_IN],0(%[R_TMP],%[R_IN])\n\t"		\
		  "    slgr %[R_INLEN],%[R_TMP]\n\t"			\
		  "    la %[R_OUT],0(%[R_TMP3],%[R_OUT])\n\t"		\
		  "    slgr %[R_OUTLEN],%[R_TMP3]\n\t"			\
		  /* Handle multibyte utf8-char with convert instruction. */ \
		  "20: cu14 %[R_OUT],%[R_IN],1\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] "=a" (tmp)	\
		    , [R_TMP2] "=d" (tmp2), [R_TMP3] "=a" (tmp3)	\
		    , [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 ("v30")	\
		    ASM_CLOBBER_VR ("v31")				\
		  );							\
    inptr = pInput;							\
    outptr = pOutput;							\
  }
# define BODY_FROM_VX BODY_FROM_HW (HW_FROM_VX)

/* Generate loop-function with hardware vector and utf-convert instructions.  */
# define MIN_NEEDED_INPUT	MIN_NEEDED_FROM
# define MAX_NEEDED_INPUT	MAX_NEEDED_FROM
# define MIN_NEEDED_OUTPUT	MIN_NEEDED_TO
# define FROM_LOOP_VX		__from_utf8_loop_vx
# define LOOPFCT		FROM_LOOP_VX

# define LOOP_NEED_FLAGS

# define STORE_REST		STORE_REST_COMMON
# define UNPACK_BYTES		UNPACK_BYTES_COMMON
# define CLEAR_STATE		CLEAR_STATE_COMMON
# define BODY			BODY_FROM_VX
# include <iconv/loop.c>
#else
# define FROM_LOOP_VX		NULL
#endif /* HAVE_FROM_VX != 1  */

#if HAVE_TO_C == 1
/* The software routine mimics the S/390 cu41 instruction.  */
# define BODY_TO_C						\
  {								\
    uint32_t wc = *((const uint32_t *) inptr);			\
								\
    if (__glibc_likely (wc <= 0x7f))				\
      {								\
	/* Single UTF-8 char.  */				\
	*outptr = (uint8_t)wc;					\
	outptr++;						\
      }								\
    else if (wc <= 0x7ff)					\
      {								\
	/* Two UTF-8 chars.  */					\
	if (__glibc_unlikely (outptr + 2 > outend))		\
	  {							\
	    /* Overflow in the output buffer.  */		\
	    result = __GCONV_FULL_OUTPUT;			\
	    break;						\
	  }							\
								\
	outptr[0] = 0xc0;					\
	outptr[0] |= wc >> 6;					\
								\
	outptr[1] = 0x80;					\
	outptr[1] |= wc & 0x3f;					\
								\
	outptr += 2;						\
      }								\
    else if (wc <= 0xffff)					\
      {								\
	/* Three UTF-8 chars.  */				\
	if (__glibc_unlikely (outptr + 3 > outend))		\
	  {							\
	    /* Overflow in the output buffer.  */		\
	    result = __GCONV_FULL_OUTPUT;			\
	    break;						\
	  }							\
	if (wc >= 0xd800 && wc <= 0xdfff)			\
	  {							\
	    /* Do not accept UTF-16 surrogates.   */		\
	    result = __GCONV_ILLEGAL_INPUT;			\
	    STANDARD_TO_LOOP_ERR_HANDLER (4);			\
	  }							\
	outptr[0] = 0xe0;					\
	outptr[0] |= wc >> 12;					\
								\
	outptr[1] = 0x80;					\
	outptr[1] |= (wc >> 6) & 0x3f;				\
								\
	outptr[2] = 0x80;					\
	outptr[2] |= wc & 0x3f;					\
								\
	outptr += 3;						\
      }								\
      else if (wc <= 0x10ffff)					\
	{							\
	  /* Four UTF-8 chars.  */				\
	  if (__glibc_unlikely (outptr + 4 > outend))		\
	    {							\
	      /* Overflow in the output buffer.  */		\
	      result = __GCONV_FULL_OUTPUT;			\
	      break;						\
	    }							\
	  outptr[0] = 0xf0;					\
	  outptr[0] |= wc >> 18;				\
								\
	  outptr[1] = 0x80;					\
	  outptr[1] |= (wc >> 12) & 0x3f;			\
								\
	  outptr[2] = 0x80;					\
	  outptr[2] |= (wc >> 6) & 0x3f;			\
								\
	  outptr[3] = 0x80;					\
	  outptr[3] |= wc & 0x3f;				\
								\
	  outptr += 4;						\
	}							\
      else							\
	{							\
	  STANDARD_TO_LOOP_ERR_HANDLER (4);			\
	}							\
    inptr += 4;							\
  }

/* Generate loop-function with software routing.  */
# define MIN_NEEDED_INPUT	MIN_NEEDED_TO
# define MIN_NEEDED_OUTPUT	MIN_NEEDED_FROM
# define MAX_NEEDED_OUTPUT	MAX_NEEDED_FROM
# define TO_LOOP_C		__to_utf8_loop_c
# define LOOPFCT		TO_LOOP_C
# define BODY			BODY_TO_C
# define LOOP_NEED_FLAGS
# include <iconv/loop.c>
#else
# define TO_LOOP_C		NULL
#endif /* HAVE_TO_C != 1  */

#if HAVE_TO_VX == 1
/* The hardware routine uses the S/390 vector instructions.  */
# define BODY_TO_VX							\
  {									\
    size_t inlen = inend - inptr;					\
    size_t outlen = outend - outptr;					\
    unsigned long tmp, tmp2, tmp3;					\
    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],64,2f\n\t"			\
		  "    clgijl %[R_OUTLEN],16,2f\n\t"			\
		  "1:  vlm %%v16,%%v19,0(%[R_IN])\n\t"			\
		  "    lghi %[R_TMP2],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],64,2f\n\t"			\
		  "    clgijl %[R_OUTLEN],16,2f\n\t"			\
		  "    j 1b\n\t"					\
		  /* Found a value > 0x7f.  */				\
		  "13: ahi %[R_TMP2],4\n\t"				\
		  "12: ahi %[R_TMP2],4\n\t"				\
		  "11: ahi %[R_TMP2],4\n\t"				\
		  "10: vlgvb %[R_TMP],%%v22,7\n\t"			\
		  "    srlg %[R_TMP],%[R_TMP],2\n\t"			\
		  "    agr %[R_TMP],%[R_TMP2]\n\t"			\
		  "    je 16f\n\t"					\
		  /* Store characters before invalid one...  */		\
		  "    slgr %[R_OUTLEN],%[R_TMP]\n\t"			\
		  "15: aghi %[R_TMP],-1\n\t"				\
		  "    vstl %%v23,%[R_TMP],0(%[R_OUT])\n\t"		\
		  /* ... and update pointers.  */			\
		  "    aghi %[R_TMP],1\n\t"				\
		  "    la %[R_OUT],0(%[R_TMP],%[R_OUT])\n\t"		\
		  "    sllg %[R_TMP2],%[R_TMP],2\n\t"			\
		  "    la %[R_IN],0(%[R_TMP2],%[R_IN])\n\t"		\
		  "    slgr %[R_INLEN],%[R_TMP2]\n\t"			\
		  /* Calculate remaining uint32_t values in loaded vrs.  */ \
		  "16: lghi %[R_TMP2],16\n\t"				\
		  "    sgr %[R_TMP2],%[R_TMP]\n\t"			\
		  "    l %[R_TMP],0(%[R_IN])\n\t"			\
		  "    aghi %[R_INLEN],-4\n\t"				\
		  "    j 22f\n\t"					\
		  /* Handle remaining bytes.  */			\
		  "2:  clgije %[R_INLEN],0,99f\n\t"			\
		  "    clgijl %[R_INLEN],4,92f\n\t"			\
		  /* Calculate remaining uint32_t values in inptr.  */	\
		  "    srlg %[R_TMP2],%[R_INLEN],2\n\t"			\
		  /* Handle multibyte utf8-char. */			\
		  "20: l %[R_TMP],0(%[R_IN])\n\t"			\
		  "    aghi %[R_INLEN],-4\n\t"				\
		  /* Test if ch is 1byte UTF-8 char. */			\
		  "21: clijh %[R_TMP],0x7f,22f\n\t"			\
		  /* Handle 1-byte UTF-8 char.  */			\
		  "31: slgfi %[R_OUTLEN],1\n\t"				\
		  "    jl 90f \n\t"					\
		  "    stc %[R_TMP],0(%[R_OUT])\n\t"			\
		  "    la %[R_IN],4(%[R_IN])\n\t"			\
		  "    la %[R_OUT],1(%[R_OUT])\n\t"			\
		  "    brctg %[R_TMP2],20b\n\t"				\
		  "    j 0b\n\t" /* Switch to vx-loop.  */		\
		  /* Test if ch is 2byte UTF-8 char. */			\
		  "22: clfi %[R_TMP],0x7ff\n\t"				\
		  "    jh 23f\n\t"					\
		  /* Handle 2-byte UTF-8 char.  */			\
		  "32: slgfi %[R_OUTLEN],2\n\t"				\
		  "    jl 90f \n\t"					\
		  "    llill %[R_TMP3],0xc080\n\t"			\
		  "    risbgn %[R_TMP3],%[R_TMP],51,55,2\n\t" /* 1. byte.   */ \
		  "    risbgn %[R_TMP3],%[R_TMP],58,63,0\n\t" /* 2. byte.   */ \
		  "    sth %[R_TMP3],0(%[R_OUT])\n\t"			\
		  "    la %[R_IN],4(%[R_IN])\n\t"			\
		  "    la %[R_OUT],2(%[R_OUT])\n\t"			\
		  "    brctg %[R_TMP2],20b\n\t"				\
		  "    j 0b\n\t" /* Switch to vx-loop.  */		\
		  /* Test if ch is 3-byte UTF-8 char.  */		\
		  "23: clfi %[R_TMP],0xffff\n\t"			\
		  "    jh 24f\n\t"					\
		  /* Handle 3-byte UTF-8 char.  */			\
		  "33: slgfi %[R_OUTLEN],3\n\t"				\
		  "    jl 90f \n\t"					\
		  "    llilf %[R_TMP3],0xe08080\n\t"			\
		  "    risbgn %[R_TMP3],%[R_TMP],44,47,4\n\t" /* 1. byte.  */ \
		  "    risbgn %[R_TMP3],%[R_TMP],50,55,2\n\t" /* 2. byte.  */ \
		  "    risbgn %[R_TMP3],%[R_TMP],58,63,0\n\t" /* 3. byte.  */ \
		  /* Test if ch is a UTF-16 surrogate: ch & 0xf800 == 0xd800  */ \
		  "    nilf %[R_TMP],0xf800\n\t"			\
		  "    clfi %[R_TMP],0xd800\n\t"			\
		  "    je 91f\n\t" /* Do not accept UTF-16 surrogates.  */ \
		  "    stcm %[R_TMP3],7,0(%[R_OUT])\n\t"		\
		  "    la %[R_IN],4(%[R_IN])\n\t"			\
		  "    la %[R_OUT],3(%[R_OUT])\n\t"			\
		  "    brctg %[R_TMP2],20b\n\t"				\
		  "    j 0b\n\t" /* Switch to vx-loop.  */		\
		  /* Test if ch is 4-byte UTF-8 char.  */		\
		  "24: clfi %[R_TMP],0x10ffff\n\t"			\
		  "    jh 91f\n\t" /* ch > 0x10ffff is not allowed!  */	\
		  /* Handle 4-byte UTF-8 char.  */			\
		  "34: slgfi %[R_OUTLEN],4\n\t"				\
		  "    jl 90f \n\t"					\
		  "    llilf %[R_TMP3],0xf0808080\n\t"			\
		  "    risbgn %[R_TMP3],%[R_TMP],37,39,6\n\t" /* 1. byte.  */ \
		  "    risbgn %[R_TMP3],%[R_TMP],42,47,4\n\t" /* 2. byte.  */ \
		  "    risbgn %[R_TMP3],%[R_TMP],50,55,2\n\t" /* 3. byte.  */ \
		  "    risbgn %[R_TMP3],%[R_TMP],58,63,0\n\t" /* 4. byte.  */ \
		  "    st %[R_TMP3],0(%[R_OUT])\n\t"			\
		  "    la %[R_IN],4(%[R_IN])\n\t"			\
		  "    la %[R_OUT],4(%[R_OUT])\n\t"			\
		  "    brctg %[R_TMP2],20b\n\t"				\
		  "    j 0b\n\t" /* Switch to vx-loop.  */		\
		  "92: lghi %[R_RES],%[RES_IN_FULL]\n\t"		\
		  "    j 99f\n\t"					\
		  "91: lghi %[R_RES],%[RES_IN_ILL]\n\t"			\
		  "    j 99f\n\t"					\
		  "90: lghi %[R_RES],%[RES_OUT_FULL]\n\t"		\
		  "99: \n\t"						\
		  ".machine pop"					\
		  : /* outputs */ [R_IN] "+a" (inptr)			\
		    , [R_INLEN] "+d" (inlen), [R_OUT] "+a" (outptr)	\
		    , [R_OUTLEN] "+d" (outlen), [R_TMP] "=a" (tmp)	\
		    , [R_TMP2] "=a" (tmp2), [R_TMP3] "=d" (tmp3)	\
		    , [R_RES] "+d" (result)				\
		  : /* inputs */					\
		    [RES_OUT_FULL] "i" (__GCONV_FULL_OUTPUT)		\
		    , [RES_IN_ILL] "i" (__GCONV_ILLEGAL_INPUT)		\
		    , [RES_IN_FULL] "i" (__GCONV_INCOMPLETE_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")				\
		  );							\
    if (__glibc_likely (inptr == inend)					\
	|| result != __GCONV_ILLEGAL_INPUT)				\
      break;								\
									\
    STANDARD_TO_LOOP_ERR_HANDLER (4);					\
  }

/* Generate loop-function with hardware vector 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		__to_utf8_loop_vx
# define LOOPFCT		TO_LOOP_VX
# define BODY			BODY_TO_VX
# define LOOP_NEED_FLAGS
# include <iconv/loop.c>
#else
# define TO_LOOP_VX		NULL
#endif /* HAVE_TO_VX != 1  */

/* This file also exists in sysdeps/s390/multiarch/ which
   generates ifunc resolvers for FROM/TO_LOOP functions
   and includes iconv/skeleton.c afterwards.  */
#if ! defined USE_MULTIARCH
# include <iconv/skeleton.c>
#endif