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re PR c++/33067 (Awkward long decimal expansion for double literal in error.)

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2011-10-11  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/33067
	* c-family/c-pretty-print.c (pp_c_floating_constant): Output
	max_digits10 (in the ISO C++ WG N1822 sense) decimal digits.

From-SVN: r179797
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Paolo Carlini 2011-10-11 10:57:40 +00:00 committed by Paolo Carlini
parent d42c1fcaf4
commit 7bc3074123
2 changed files with 19 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2011-10-11 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/33067
* c-family/c-pretty-print.c (pp_c_floating_constant): Output
max_digits10 (in the ISO C++ WG N1822 sense) decimal digits.
2011-10-11 Richard Sandiford <richard.sandiford@linaro.org> 2011-10-11 Richard Sandiford <richard.sandiford@linaro.org>
* modulo-sched.c: Fix comment typo. Mention the possibility * modulo-sched.c: Fix comment typo. Mention the possibility

14
gcc/c-family/c-pretty-print.c
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@ -1018,8 +1018,20 @@ pp_c_enumeration_constant (c_pretty_printer *pp, tree e)
static void static void
pp_c_floating_constant (c_pretty_printer *pp, tree r) pp_c_floating_constant (c_pretty_printer *pp, tree r)
{ {
const struct real_format *fmt
= REAL_MODE_FORMAT (TYPE_MODE (TREE_TYPE (r)));
REAL_VALUE_TYPE floating_cst = TREE_REAL_CST (r);
bool is_decimal = floating_cst.decimal;
/* See ISO C++ WG N1822. Note: The fraction 643/2136 approximates
log10(2) to 7 significant digits. */
int max_digits10 = 2 + (is_decimal ? fmt->p : fmt->p * 643L / 2136);
real_to_decimal (pp_buffer (pp)->digit_buffer, &TREE_REAL_CST (r), real_to_decimal (pp_buffer (pp)->digit_buffer, &TREE_REAL_CST (r),
sizeof (pp_buffer (pp)->digit_buffer), 0, 1); sizeof (pp_buffer (pp)->digit_buffer),
max_digits10, 1);
pp_string (pp, pp_buffer(pp)->digit_buffer); pp_string (pp, pp_buffer(pp)->digit_buffer);
if (TREE_TYPE (r) == float_type_node) if (TREE_TYPE (r) == float_type_node)
pp_character (pp, 'f'); pp_character (pp, 'f');