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target/105459 - allow delayed target option node fixup 

The following avoids the need to massage the target optimization
node at WPA time when we fixup the optimization node, copying
FP related flags from callee to caller.  The target is already
set up to fixup, but that only works when not switching between
functions.  After fixing that the fixup is then done at LTRANS
time when materializing the function.

2022-07-01  Richard Biener  <rguenthert@suse.de>

	PR target/105459
	* config/i386/i386-options.cc (ix86_set_current_function):
	Rebuild the target optimization node whenever necessary,
	not only when the optimization node didn't change.

	* gcc.dg/lto/pr105459_0.c: New testcase.

(cherry picked from commit 4c94382a13)
This commit is contained in:
Richard Biener 2022-07-01 14:11:35 +02:00
parent f25b0b91d1
commit 4ed850a568
2 changed files with 48 additions and 19 deletions
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32
gcc/config/i386/i386-options.cc
View File

@ -3229,28 +3229,22 @@ ix86_set_current_function (tree fndecl)
if (new_tree == NULL_TREE)
new_tree = target_option_default_node;
if (old_tree != new_tree)
bool fp_flag_change
= (flag_unsafe_math_optimizations
!= TREE_TARGET_OPTION (new_tree)->x_ix86_unsafe_math_optimizations
|| (flag_excess_precision
!= TREE_TARGET_OPTION (new_tree)->x_ix86_excess_precision));
if (old_tree != new_tree || fp_flag_change)
{
cl_target_option_restore (&global_options, &global_options_set,
TREE_TARGET_OPTION (new_tree));
if (TREE_TARGET_GLOBALS (new_tree))
restore_target_globals (TREE_TARGET_GLOBALS (new_tree));
else if (new_tree == target_option_default_node)
restore_target_globals (&default_target_globals);
else
TREE_TARGET_GLOBALS (new_tree) = save_target_globals_default_opts ();
}
else if (flag_unsafe_math_optimizations
!= TREE_TARGET_OPTION (new_tree)->x_ix86_unsafe_math_optimizations
|| (flag_excess_precision
!= TREE_TARGET_OPTION (new_tree)->x_ix86_excess_precision))
{
cl_target_option_restore (&global_options, &global_options_set,
TREE_TARGET_OPTION (new_tree));
ix86_excess_precision = flag_excess_precision;
ix86_unsafe_math_optimizations = flag_unsafe_math_optimizations;
DECL_FUNCTION_SPECIFIC_TARGET (fndecl) = new_tree
= build_target_option_node (&global_options, &global_options_set);
if (fp_flag_change)
{
ix86_excess_precision = flag_excess_precision;
ix86_unsafe_math_optimizations = flag_unsafe_math_optimizations;
DECL_FUNCTION_SPECIFIC_TARGET (fndecl) = new_tree
= build_target_option_node (&global_options, &global_options_set);
}
if (TREE_TARGET_GLOBALS (new_tree))
restore_target_globals (TREE_TARGET_GLOBALS (new_tree));
else if (new_tree == target_option_default_node)

35
gcc/testsuite/gcc.dg/lto/pr105459_0.c Normal file
View File

@ -0,0 +1,35 @@
/* { dg-lto-do link } */
/* { dg-lto-options { { -flto -O1 } } } */
double m;
int n;
__attribute__ ((optimize ("-funsafe-math-optimizations")))
void
bar (int x)
{
n = x;
m = n;
}
__attribute__ ((flatten))
void
foo (int x)
{
bar (x);
}
void
quux (void)
{
++n;
}
int
main (void)
{
foo (0);
quux ();
return 0;
}