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[Bug rtl-optimization/50904] [4.7 regression] pessimization when -fno-protect-parens is enabled by -Ofast
- From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 05 Dec 2011 09:21:15 +0000
- Subject: [Bug rtl-optimization/50904] [4.7 regression] pessimization when -fno-protect-parens is enabled by -Ofast
- Auto-submitted: auto-generated
- References: <bug-50904-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50904
--- Comment #39 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-12-05 09:21:15 UTC ---
> Thus, I think if at the RTL level we see a missed invariant motion then
> this is a RTL level bug (esp. if it only triggers with -fno-protect-parens).
Well, how can the RTL level invent load hoisting opportunities? They are of
course already present at the Tree level, see the .optimized dump:
vect_var_.124_350 = MEM[(real(kind=8)[9] *)&x2gauss];
vect_var_.133_823 = MEM[(real(kind=8)[9] *)&y2gauss];
vect_var_.157_586 = MEM[(real(kind=8)[9] *)&w2gauss];
vect_var_.124_357 = MEM[(real(kind=8)[9] *)&x2gauss + 16B];
vect_var_.133_363 = MEM[(real(kind=8)[9] *)&y2gauss + 16B];
vect_var_.157_874 = MEM[(real(kind=8)[9] *)&w2gauss + 16B];
vect_var_.124_405 = MEM[(real(kind=8)[9] *)&x2gauss + 32B];
vect_var_.133_594 = MEM[(real(kind=8)[9] *)&y2gauss + 32B];
vect_var_.157_610 = MEM[(real(kind=8)[9] *)&w2gauss + 32B];
vect_var_.124_651 = MEM[(real(kind=8)[9] *)&x2gauss + 48B];
vect_var_.133_680 = MEM[(real(kind=8)[9] *)&y2gauss + 48B];
vect_var_.157_805 = MEM[(real(kind=8)[9] *)&w2gauss + 48B];