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[Bug rtl-optimization/79437] Redundant move instruction when getting sign bit of double on 32-bit architecture
- From: "jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 09 Feb 2017 10:27:54 +0000
- Subject: [Bug rtl-optimization/79437] Redundant move instruction when getting sign bit of double on 32-bit architecture
- Auto-submitted: auto-generated
- References: <bug-79437-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79437
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |jakub at gcc dot gnu.org,
| |uros at gcc dot gnu.org,
| |vmakarov at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Even -mno-stv doesn't help here, the problem is that for the shift we don't
lower DImode operations here until too late (split2) and so EDX:EAX is used for
the 64-bit value.