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From: Michael Meissner <meissner@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc(refs/users/meissner/heads/work068)] Avoid NaN and denormal values in XXSPLTIDP. Date: Tue, 14 Sep 2021 14:29:54 +0000 (GMT) [thread overview] Message-ID: <20210914142954.608A73858402@sourceware.org> (raw) https://gcc.gnu.org/g:39dfb439be18b0b820f02dbe2c51999721ff58fc commit 39dfb439be18b0b820f02dbe2c51999721ff58fc Author: Michael Meissner <meissner@linux.ibm.com> Date: Tue Sep 14 10:29:25 2021 -0400 Avoid NaN and denormal values in XXSPLTIDP. 2021-09-14 Michael Meissner <meissner@linux.ibm.com> gcc/ * config/rs6000/predicates.md (easy_fp_constant_float_to_v2df): Avoid integer values that look like NaN or denormal values in XXSPLTIDP. Diff: --- gcc/config/rs6000/predicates.md | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/gcc/config/rs6000/predicates.md b/gcc/config/rs6000/predicates.md index c8f7d975b7c..635a08ec8d6 100644 --- a/gcc/config/rs6000/predicates.md +++ b/gcc/config/rs6000/predicates.md @@ -666,6 +666,11 @@ HOST_WIDE_INT df_value = INTVAL (element); long df_words[2]; + /* Stay away from NaNs and denormal values. */ + int exponent = (df_value >> 52) & 0x7ff; + if (exponent == 0 || exponent == 0x7ff) + return false; + df_words[0] = (df_value >> 32) & 0xffffffff; df_words[1] = df_value & 0xffffffff;
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