On Thu, 22 Jan 2015, Jan Hubicka wrote:
> >
> > As said in the other thread - this makes sure we don't perform inlining
> > that might end up generating invalid code. It also preserves
> > user-provided optimize attributes more properly.
> >
> > Bootstrapped and tested on x86_64-unknown-linux-gnu, applied to trunk.
> >
> > Richard.
> >
> > 2015-01-22 Richard Biener <rguent...@suse.de>
> >
> > * ipa-inline.c (can_inline_edge_p): Disable inlining of edges
> > with IL incompatible options. Properly honor user optimize
> > attributes.
>
> Thanks, in fact I had similar patch in queue, just wanted to catch you on IRC
> and discuss posibility of making this a flag in common.opt
Sure - I briefly considered this but we're in stage4 now so I was just
fixing the obvious correctness issues.
We also have to fix
/* Don't inline if the callee can throw non-call exceptions but the
caller cannot.
FIXME: this is obviously wrong for LTO where STRUCT_FUNCTION is
missing.
Move the flag into cgraph node or mirror it in the inline summary.
*/
else if (callee_fun && callee_fun->can_throw_non_call_exceptions
&& !(caller_fun && caller_fun->can_throw_non_call_exceptions))
{
e->inline_failed = CIF_NON_CALL_EXCEPTIONS;
inlinable = false;
}
in some way (eventually we can just use opt_for_fn
()->flag_non_call_exceptions).
Richard.
> Honza
> >
> > Index: gcc/ipa-inline.c
> > ===================================================================
> > --- gcc/ipa-inline.c (revision 219929)
> > +++ gcc/ipa-inline.c (working copy)
> > @@ -404,17 +404,56 @@ can_inline_edge_p (struct cgraph_edge *e
> > optimization attribute. */
> > else if (caller_tree != callee_tree)
> > {
> > - /* gcc.dg/pr43564.c. Look at forced inline even in -O0. */
> > - if (DECL_DISREGARD_INLINE_LIMITS (callee->decl))
> > + /* There are some options that change IL semantics which means
> > + we cannot inline in these cases for correctness reason.
> > + Not even for always_inline declared functions. */
> > + /* Strictly speaking only when the callee contains signed integer
> > + math where overflow is undefined. */
> > + if ((opt_for_fn (e->caller->decl, flag_strict_overflow)
> > + != opt_for_fn (e->caller->decl, flag_strict_overflow))
> > + || (opt_for_fn (e->caller->decl, flag_wrapv)
> > + != opt_for_fn (e->caller->decl, flag_wrapv))
> > + || (opt_for_fn (e->caller->decl, flag_trapv)
> > + != opt_for_fn (e->caller->decl, flag_trapv))
> > + /* Strictly speaking only when the callee contains memory
> > + accesses that are not using alias-set zero anyway. */
> > + || (opt_for_fn (e->caller->decl, flag_strict_aliasing)
> > + != opt_for_fn (e->caller->decl, flag_strict_aliasing))
> > + /* Strictly speaking only when the callee uses FP math. */
> > + || (opt_for_fn (e->caller->decl, flag_rounding_math)
> > + != opt_for_fn (e->caller->decl, flag_rounding_math))
> > + || (opt_for_fn (e->caller->decl, flag_trapping_math)
> > + != opt_for_fn (e->caller->decl, flag_trapping_math))
> > + || (opt_for_fn (e->caller->decl, flag_unsafe_math_optimizations)
> > + != opt_for_fn (e->caller->decl, flag_unsafe_math_optimizations))
> > + || (opt_for_fn (e->caller->decl, flag_finite_math_only)
> > + != opt_for_fn (e->caller->decl, flag_finite_math_only))
> > + || (opt_for_fn (e->caller->decl, flag_signaling_nans)
> > + != opt_for_fn (e->caller->decl, flag_signaling_nans))
> > + || (opt_for_fn (e->caller->decl, flag_cx_limited_range)
> > + != opt_for_fn (e->caller->decl, flag_cx_limited_range))
> > + || (opt_for_fn (e->caller->decl, flag_signed_zeros)
> > + != opt_for_fn (e->caller->decl, flag_signed_zeros))
> > + || (opt_for_fn (e->caller->decl, flag_associative_math)
> > + != opt_for_fn (e->caller->decl, flag_associative_math))
> > + || (opt_for_fn (e->caller->decl, flag_reciprocal_math)
> > + != opt_for_fn (e->caller->decl, flag_reciprocal_math))
> > + /* Strictly speaking only when the callee contains function
> > + calls that may end up setting errno. */
> > + || (opt_for_fn (e->caller->decl, flag_errno_math)
> > + != opt_for_fn (e->caller->decl, flag_errno_math)))
> > + {
> > + e->inline_failed = CIF_OPTIMIZATION_MISMATCH;
> > + inlinable = false;
> > + }
> > + /* gcc.dg/pr43564.c. Apply user-forced inline even at -O0. */
> > + else if (DECL_DISREGARD_INLINE_LIMITS (callee->decl)
> > + && lookup_attribute ("always_inline",
> > + DECL_ATTRIBUTES (callee->decl)))
> > ;
> > - /* When user added an attribute, honnor it. */
> > - else if ((lookup_attribute ("optimize", DECL_ATTRIBUTES
> > (caller->decl))
> > - || lookup_attribute ("optimize",
> > - DECL_ATTRIBUTES (callee->decl)))
> > - && ((opt_for_fn (caller->decl, optimize)
> > - > opt_for_fn (callee->decl, optimize))
> > - || (opt_for_fn (caller->decl, optimize_size)
> > - != opt_for_fn (callee->decl, optimize_size))))
> > + /* When user added an attribute to the callee honor it. */
> > + else if (lookup_attribute ("optimize", DECL_ATTRIBUTES
> > (callee->decl))
> > + && opts_for_fn (caller->decl) != opts_for_fn (callee->decl))
> > {
> > e->inline_failed = CIF_OPTIMIZATION_MISMATCH;
> > inlinable = false;
>
>
--
Richard Biener <rguent...@suse.de>
SUSE LINUX GmbH, GF: Felix Imendoerffer, Jane Smithard, Jennifer Guild,
Dilip Upmanyu, Graham Norton HRB 21284 (AG Nuernberg)
