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From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/24082] New: Not that good register allocating on powerpc for vectors Date: Tue, 27 Sep 2005 14:47:00 -0000 [thread overview] Message-ID: <20050927144729.24082.pinskia@gcc.gnu.org> (raw) Take the following code: vector int bar3(long long x) { return (vector int)(vector long long){x,x}; } --- Currently we get: _bar3: mfspr r0,256 stw r0,-8(r1) oris r0,r0,0x8000 mtspr 256,r0 addi r2,r1,-32 stw r3,0(r2) stw r4,4(r2) stw r3,8(r2) stw r4,12(r2) lvx v0,0,r2 lwz r12,-8(r1) vor v2,v0,v0 mtspr 256,r12 blr But we should really allocate v0 in v2, removing the save/restore/setting of VRSAVE. Like: _bar3: addi r2,r1,-32 stw r3,0(r2) stw r4,4(r2) stw r3,8(r2) stw r4,12(r2) lvx v2,0,r2 blr -- Summary: Not that good register allocating on powerpc for vectors Product: gcc Version: 4.1.0 Status: UNCONFIRMED Keywords: missed-optimization, ra Severity: enhancement Priority: P2 Component: rtl-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: pinskia at gcc dot gnu dot org CC: gcc-bugs at gcc dot gnu dot org GCC target triplet: powerpc-darwin http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24082
next reply other threads:[~2005-09-27 14:47 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2005-09-27 14:47 pinskia at gcc dot gnu dot org [this message] 2005-09-27 14:56 ` [Bug rtl-optimization/24082] " pinskia at gcc dot gnu dot org
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