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* c/7831: GCC 3.2 MIPS64 endian issues
@ 2002-09-04 18:56 cvansch
0 siblings, 0 replies; only message in thread
From: cvansch @ 2002-09-04 18:56 UTC (permalink / raw)
To: gcc-gnats
>Number: 7831
>Category: c
>Synopsis: GCC 3.2 MIPS64 endian issues
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Wed Sep 04 18:56:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Carl van Schaik
>Release: gcc version 3.2
>Organization:
>Environment:
x86 host, mips64el-l4-elf-gcc crosscompiler
Configured with: ./configure --target=mips64el-l4-elf --enable-64-bit-bfd --enable-languages=c --with-gnu-as --with-gnu-ld : (reconfigured) ./configure --target=mips64el-l4-elf --enable-64-bit-bfd --enable-languages=c --with-gnu-as --with-gnu-ld --prefix=/usr/local/mips : (reconfigured) ./configure --target=mips64el-l4-elf --enable-64-bit-bfd --enable-languages=c --with-gnu-as --with-gnu-ld --prefix=/usr/local/mips : (reconfigured) ./configure --target=mips64el-l4-elf --enable-64-bit-bfd --enable-languages=c,c++ --with-gnu-as --with-gnu-ld --prefix=/usr/local/mips
>Description:
gcc compiled to default to little endian, but is producing some big-endian load/stores.
Specific problem was fixed by specifiing "-EL" compiler flag.
Assembler code showed:
1fc8: ffa20030 sd v0,48(sp)
...
1fe4: dfa20008 ld v0,8(sp)
1fe8: 0002103e dsrl32 v0,v0,0x0
...
1ffc: dfa30008 ld v1,8(sp)
2000: 8fa20030 lw v0,52(sp) <- error here, should be 48(sp)
2004: 00431016 dsrlv v0,v1,v0
>How-To-Repeat:
with no optimizations, the extracted code would be equivalent to:
word_t = unsigned long int
word_t i = 32;
printf("x = %x\n", (word_t) vaddr >> 32);
printf("x = %x %x\n", (word_t) vaddr >> i, i);
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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2002-09-04 18:56 c/7831: GCC 3.2 MIPS64 endian issues cvansch
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