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[Bug target/19102] [3.4 Regression] -march=pentium3 breaks linux kernel compiles w/ gcc-3_4-branch as of 2004/12/20
- From: "ebotcazou at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 22 Dec 2004 20:24:26 -0000
- Subject: [Bug target/19102] [3.4 Regression] -march=pentium3 breaks linux kernel compiles w/ gcc-3_4-branch as of 2004/12/20
- References: <20041221101640.19102.bero@arklinux.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From ebotcazou at gcc dot gnu dot org 2004-12-22 20:24 -------
> > Why do we allow MMX modes in SSE regs now?
>
> Because x86-64 calling conventions demand it.
The calling conventions for vector types I presume? The problem is that SImode
slipped through the cracks so the register allocator now jumps from SIREG to
INT_SSE_REGS for SImode pseudos. Is that an unintended side-effect?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19102