From 9b054b08813d37586d6765fd087b0fc85dc94daf Mon Sep 17 00:00:00 2001 From: Richard Sandiford Date: Tue, 13 Oct 2015 07:34:41 +0000 Subject: To... To: gcc-patches@gcc.gnu.org Subject: Add an extra pow rule to match.pd From: Richard Sandiford Gcc: private.sent --text follows this line-- Simplify pow(|x|,y) and pow(-x,y) to pow(x,y) if y is an even integer. At the moment this duplicates a case in fold_builtin_pow, but an upcoming patch will move all the fold_builtin_pow rules to match.pd. I'm doing this one early to fix a regression in builtin-10.c for soft-float ARM. gcc/ * real.h (real_isinteger): Declare. * real.c (real_isinteger): New function. * match.pd: Simplify pow(|x|,y) and pow(-x,y) to pow(x,y) if y is an even integer. From-SVN: r228750 --- gcc/real.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'gcc/real.c') diff --git a/gcc/real.c b/gcc/real.c index f633ffd2e88..85ac83d3fdc 100644 --- a/gcc/real.c +++ b/gcc/real.c @@ -4997,6 +4997,24 @@ real_isinteger (const REAL_VALUE_TYPE *c, machine_mode mode) return real_identical (c, &cint); } +/* Check whether C is an integer that fits in a HOST_WIDE_INT, + storing it in *INT_OUT if so. */ + +bool +real_isinteger (const REAL_VALUE_TYPE *c, HOST_WIDE_INT *int_out) +{ + REAL_VALUE_TYPE cint; + + HOST_WIDE_INT n = real_to_integer (c); + real_from_integer (&cint, VOIDmode, n, SIGNED); + if (real_identical (c, &cint)) + { + *int_out = n; + return true; + } + return false; +} + /* Write into BUF the maximum representable finite floating-point number, (1 - b**-p) * b**emax for a given FP format FMT as a hex float string. LEN is the size of BUF, and the buffer must be large -- cgit v1.2.3