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re PR middle-end/43419 (gcc replaces pow(x, 0.5) by sqrt(x), invalid when x is -0)
PR middle-end/43419 * builtins.c (expand_builtin_pow): Don't transform pow(x, 0.5) into sqrt(x) if we need to preserve signed zeros. testsuite/ * gcc.dg/pr43419.c: New testcase. From-SVN: r157543
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@ -1,3 +1,9 @@
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2010-03-18 Michael Matz <matz@suse.de>
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PR middle-end/43419
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* builtins.c (expand_builtin_pow): Don't transform pow(x, 0.5)
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into sqrt(x) if we need to preserve signed zeros.
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2010-03-18 Steven Bosscher <steven@gcc.gnu.org>
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Eric Botcazou <ebotcazou@adacore.com>
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@ -2980,7 +2980,10 @@ expand_builtin_pow (tree exp, rtx target, rtx subtarget)
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&& ((flag_unsafe_math_optimizations
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&& optimize_insn_for_speed_p ()
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&& powi_cost (n/2) <= POWI_MAX_MULTS)
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|| n == 1))
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/* Even the c==0.5 case cannot be done unconditionally
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when we need to preserve signed zeros, as
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pow (-0, 0.5) is +0, while sqrt(-0) is -0. */
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|| (!HONOR_SIGNED_ZEROS (mode) && n == 1)))
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{
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tree call_expr = build_call_nofold (fn, 1, narg0);
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/* Use expand_expr in case the newly built call expression
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@ -1,3 +1,8 @@
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2010-03-18 Michael Matz <matz@suse.de>
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PR middle-end/43419
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* gcc.dg/pr43419.c: New testcase.
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2010-03-18 H.J. Lu <hongjiu.lu@intel.com>
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PR rtl-optimization/43360
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@ -16,10 +21,10 @@
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2010-03-17 Jerry DeLisle <jvdelisle@gcc.gnu.org>
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PR libfortran/43265
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*gfortran.dg/read_empty_file.f: New test.
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*gfortran.dg/read_eof_all.f90: New test.
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*gfortran.dg/namelist_27.f90: Eliminate infinite loop posibility.
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*gfortran.dg/namelist_28.f90: Eliminate infinite loop posibility.
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* gfortran.dg/read_empty_file.f: New test.
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* gfortran.dg/read_eof_all.f90: New test.
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* gfortran.dg/namelist_27.f90: Eliminate infinite loop posibility.
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* gfortran.dg/namelist_28.f90: Eliminate infinite loop posibility.
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2010-03-17 Michael Matz <matz@suse.de>
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19
gcc/testsuite/gcc.dg/pr43419.c
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19
gcc/testsuite/gcc.dg/pr43419.c
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/* { dg-do run } */
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/* { dg-options "-O1" } */
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/* { dg-add-options ieee } */
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#include <math.h>
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extern void abort (void);
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void __attribute__((noinline)) f (double x)
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{
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double pluszero = pow (x, 0.5);
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double minuszero = sqrt (x);
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if (signbit (pluszero) == signbit (minuszero))
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abort ();
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}
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int main(void)
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{
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f (-0.0);
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return 0;
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}
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