From 1626f499d159f17d5d99dc41497b52074f3850df Mon Sep 17 00:00:00 2001 From: "Gabriel F. T. Gomes" Date: Thu, 27 Jun 2019 17:43:44 -0300 Subject: Prepare vfprintf to use __printf_fp/__printf_fphex with float128 arg On powerpc64le, long double can currently take two formats: the same as double (-mlong-double-64) or IBM Extended Precision (default with -mlong-double-128 or explicitly with -mabi=ibmlongdouble). The internal implementation of printf-like functions is aware of these possibilities and properly parses floating-point values from the variable arguments, before making calls to __printf_fp and __printf_fphex. These functions are also aware of the format possibilities and know how to convert both formats to string. When library support for TS 18661-3 was added to glibc, __printf_fp and __printf_fphex were extended with support for an additional type (__float128/_Float128) with a different format (binary128). Now that powerpc64le is getting support for its third long double format, and taking into account that this format is the same as the format of __float128/_Float128, this patch extends __vfprintf_internal to properly call __printf_fp and __printf_fphex with this new format. Tested for powerpc64le (with additional patches to actually enable the use of these preparations) and for x86_64. Reviewed-by: Adhemerval Zanella --- stdio-common/printf-parse.h | 3 ++ stdio-common/vfprintf-internal.c | 73 +++++++++++++++++++++++++++++++++------- 2 files changed, 63 insertions(+), 13 deletions(-) (limited to 'stdio-common') diff --git a/stdio-common/printf-parse.h b/stdio-common/printf-parse.h index 3975086..00f3280 100644 --- a/stdio-common/printf-parse.h +++ b/stdio-common/printf-parse.h @@ -57,6 +57,9 @@ union printf_arg unsigned long long int pa_u_long_long_int; double pa_double; long double pa_long_double; +#if __HAVE_FLOAT128_UNLIKE_LDBL + _Float128 pa_float128; +#endif const char *pa_string; const wchar_t *pa_wstring; void *pa_pointer; diff --git a/stdio-common/vfprintf-internal.c b/stdio-common/vfprintf-internal.c index ead2b04..d9dca78 100644 --- a/stdio-common/vfprintf-internal.c +++ b/stdio-common/vfprintf-internal.c @@ -68,6 +68,57 @@ } while (0) #define UNBUFFERED_P(S) ((S)->_flags & _IO_UNBUFFERED) +#if __HAVE_FLOAT128_UNLIKE_LDBL +# define PARSE_FLOAT_VA_ARG_EXTENDED(INFO) \ + do \ + { \ + if (is_long_double \ + && (mode_flags & PRINTF_LDBL_USES_FLOAT128) != 0) \ + { \ + INFO.is_binary128 = 1; \ + the_arg.pa_float128 = va_arg (ap, _Float128); \ + } \ + else \ + { \ + PARSE_FLOAT_VA_ARG (INFO); \ + } \ + } \ + while (0) +#else +# define PARSE_FLOAT_VA_ARG_EXTENDED(INFO) \ + PARSE_FLOAT_VA_ARG (INFO); +#endif + +#define PARSE_FLOAT_VA_ARG(INFO) \ + do \ + { \ + INFO.is_binary128 = 0; \ + if (is_long_double) \ + the_arg.pa_long_double = va_arg (ap, long double); \ + else \ + the_arg.pa_double = va_arg (ap, double); \ + } \ + while (0) + +#if __HAVE_FLOAT128_UNLIKE_LDBL +# define SETUP_FLOAT128_INFO(INFO) \ + do \ + { \ + if ((mode_flags & PRINTF_LDBL_USES_FLOAT128) != 0) \ + INFO.is_binary128 = is_long_double; \ + else \ + INFO.is_binary128 = 0; \ + } \ + while (0) +#else +# define SETUP_FLOAT128_INFO(INFO) \ + do \ + { \ + INFO.is_binary128 = 0; \ + } \ + while (0) +#endif + #define done_add(val) \ do { \ unsigned int _val = val; \ @@ -771,10 +822,7 @@ static const uint8_t jump_table[] = .wide = sizeof (CHAR_T) != 1, \ .is_binary128 = 0}; \ \ - if (is_long_double) \ - the_arg.pa_long_double = va_arg (ap, long double); \ - else \ - the_arg.pa_double = va_arg (ap, double); \ + PARSE_FLOAT_VA_ARG_EXTENDED (info); \ ptr = (const void *) &the_arg; \ \ function_done = __printf_fp (s, &info, &ptr); \ @@ -787,8 +835,7 @@ static const uint8_t jump_table[] = fspec->data_arg_type = PA_DOUBLE; \ fspec->info.is_long_double = 0; \ } \ - /* Not supported by *printf functions. */ \ - fspec->info.is_binary128 = 0; \ + SETUP_FLOAT128_INFO (fspec->info); \ \ function_done = __printf_fp (s, &fspec->info, &ptr); \ } \ @@ -831,10 +878,7 @@ static const uint8_t jump_table[] = .wide = sizeof (CHAR_T) != 1, \ .is_binary128 = 0}; \ \ - if (is_long_double) \ - the_arg.pa_long_double = va_arg (ap, long double); \ - else \ - the_arg.pa_double = va_arg (ap, double); \ + PARSE_FLOAT_VA_ARG_EXTENDED (info); \ ptr = (const void *) &the_arg; \ \ function_done = __printf_fphex (s, &info, &ptr); \ @@ -844,8 +888,7 @@ static const uint8_t jump_table[] = ptr = (const void *) &args_value[fspec->data_arg]; \ if (__glibc_unlikely ((mode_flags & PRINTF_LDBL_IS_DBL) != 0)) \ fspec->info.is_long_double = 0; \ - /* Not supported by *printf functions. */ \ - fspec->info.is_binary128 = 0; \ + SETUP_FLOAT128_INFO (fspec->info); \ \ function_done = __printf_fphex (s, &fspec->info, &ptr); \ } \ @@ -1869,6 +1912,10 @@ printf_positional (FILE *s, const CHAR_T *format, int readonly_format, args_value[cnt].pa_double = va_arg (*ap_savep, double); args_type[cnt] &= ~PA_FLAG_LONG_DOUBLE; } +#if __HAVE_FLOAT128_UNLIKE_LDBL + else if ((mode_flags & PRINTF_LDBL_USES_FLOAT128) != 0) + args_value[cnt].pa_float128 = va_arg (*ap_savep, _Float128); +#endif else args_value[cnt].pa_long_double = va_arg (*ap_savep, long double); break; @@ -1887,7 +1934,7 @@ printf_positional (FILE *s, const CHAR_T *format, int readonly_format, (args_value[cnt].pa_user, ap_savep); } else - args_value[cnt].pa_long_double = 0.0; + memset (&args_value[cnt], 0, sizeof (args_value[cnt])); break; case -1: /* Error case. Not all parameters appear in N$ format -- cgit v1.1