From 312992f5a07ca25f94d538b08401789c2c764293 Mon Sep 17 00:00:00 2001 From: Jakub Jelinek Date: Wed, 11 Mar 2020 09:33:52 +0100 Subject: [PATCH] dfp: Fix decimal_to_binary [PR94111] As e.g. decimal_from_decnumber shows, the REAL_VALUE_TYPE representation contains a decimal128 embedded in ->sig only if it is rvc_normal, for other kinds like rvc_inf or rvc_nan, ->sig is ignored and everything is contained in the REAL_VALUE_TYPE flags (cl, sign, signalling and decimal). decimal_to_binary which is used when folding a decimal{32,64,128} constant to a binary floating point type ignores this and thus folds infinities and NaNs into +0.0. The following patch fixes that by only doing that for rvc_normal. Similarly to the binary to decimal folding, it goes through a string, in order to e.g. deal with canonical NaN mantissas, or binary float formats that don't support infinities and/or NaNs. 2020-03-11 Jakub Jelinek PR middle-end/94111 * dfp.c (decimal_to_binary): Only use decimal128ToString if from->cl is rvc_normal, otherwise use real_to_decimal to print the number to string. * gcc.dg/dfp/pr94111.c: New test. --- gcc/ChangeLog | 5 +++++ gcc/dfp.c | 10 +++++++--- gcc/testsuite/ChangeLog | 3 +++ gcc/testsuite/gcc.dg/dfp/pr94111.c | 12 ++++++++++++ 4 files changed, 27 insertions(+), 3 deletions(-) create mode 100644 gcc/testsuite/gcc.dg/dfp/pr94111.c diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 6630a20a625..b2d8ee1c830 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,10 @@ 2020-03-11 Jakub Jelinek + PR middle-end/94111 + * dfp.c (decimal_to_binary): Only use decimal128ToString if from->cl + is rvc_normal, otherwise use real_to_decimal to print the number to + string. + PR tree-optimization/94114 * tree-loop-distribution.c (generate_memset_builtin): Call rewrite_to_non_trapping_overflow even on mem. diff --git a/gcc/dfp.c b/gcc/dfp.c index 688fab490e7..fef39a5ce39 100644 --- a/gcc/dfp.c +++ b/gcc/dfp.c @@ -342,9 +342,13 @@ decimal_to_binary (REAL_VALUE_TYPE *to, const REAL_VALUE_TYPE *from, const real_format *fmt) { char string[256]; - const decimal128 *const d128 = (const decimal128 *) from->sig; - - decimal128ToString (d128, string); + if (from->cl == rvc_normal) + { + const decimal128 *const d128 = (const decimal128 *) from->sig; + decimal128ToString (d128, string); + } + else + real_to_decimal (string, from, sizeof (string), 0, 1); real_from_string3 (to, string, fmt); } diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 954c4511816..3a4acce6746 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,5 +1,8 @@ 2020-03-11 Jakub Jelinek + PR middle-end/94111 + * gcc.dg/dfp/pr94111.c: New test. + PR tree-optimization/94114 * gcc.dg/pr94114.c: New test. diff --git a/gcc/testsuite/gcc.dg/dfp/pr94111.c b/gcc/testsuite/gcc.dg/dfp/pr94111.c new file mode 100644 index 00000000000..ea3a132270a --- /dev/null +++ b/gcc/testsuite/gcc.dg/dfp/pr94111.c @@ -0,0 +1,12 @@ +/* PR middle-end/94111 */ +/* { dg-do run } */ +/* { dg-options "-O2" } */ + +int +main () +{ + _Decimal32 d = (_Decimal32) __builtin_inff (); + if (!__builtin_isinf ((double) d)) + __builtin_abort (); + return 0; +} -- 2.30.2