PR/46978 CVS commit: [netbsd-6] src/external/gpl3/gcc/dist/gcc/config/i386

["Jeff Rizzo" <riz%netbsd.org@localhost>]

The following reply was made to PR bin/46978; it has been noted by GNATS.

From: "Jeff Rizzo" <riz%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/46978 CVS commit: [netbsd-6] 
src/external/gpl3/gcc/dist/gcc/config/i386
Date: Wed, 17 Oct 2012 21:30:33 +0000

 Module Name:   src
 Committed By:  riz
 Date:          Wed Oct 17 21:30:33 UTC 2012
 
 Modified Files:
        src/external/gpl3/gcc/dist/gcc/config/i386 [netbsd-6]: i386.c i386.h
            netbsd-elf.h netbsd64.h
 
 Log Message:
 Pull up following revision(s) (requested by joerg in ticket #560):
        external/gpl3/gcc/dist/gcc/config/i386/netbsd-elf.h: revision 1.3
        external/gpl3/gcc/dist/gcc/config/i386/netbsd64.h: revision 1.2
        external/gpl3/gcc/dist/gcc/config/i386/i386.c: revision 1.2
        external/gpl3/gcc/dist/gcc/config/i386/i386.h: revision 1.2
 Fix GCC to correctly implement the i386 psABI on NetBSD.
 This consists of two parts:
 - for NetBSD/i386 and NetBSD/AMD64 with -m32, use a default stack
   alignment of 23bit as specified by the ABI
 - ensure that double and long long variables on the stack are by default
   only aligned to 32bit, if there is nothing else in the function
   needing a larger stack alignment
 The combination ensures that SSE variables on the stack trigger the
 realignment logic, but just using double or long long doesn't.
 PR 46978: ICE on spilling MMX registers
 GCC/i386 has code to lower the required alignment for long long to 32bit
 as the CPU doesn't need more. It is also using the same mode for setting
 up the MMX registers and in turn, the stack slots reserved for spilling
 require 32bit alignment. The actual vector types used keep the original
 64bit alignment, so when the compiler wants to spill a MMX register, it
 hits an assertion. Fix this by using the vector type as raw type for MMX
 registers.
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.1.1.1 -r1.1.1.1.4.1 \
     src/external/gpl3/gcc/dist/gcc/config/i386/i386.c \
     src/external/gpl3/gcc/dist/gcc/config/i386/i386.h \
     src/external/gpl3/gcc/dist/gcc/config/i386/netbsd64.h
 cvs rdiff -u -r1.2 -r1.2.2.1 \
     src/external/gpl3/gcc/dist/gcc/config/i386/netbsd-elf.h
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.