* egcs egcs-980925 3pm PDT miscompiled libg++
@ 1998-09-26 0:52 H.J. Lu
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From: H.J. Lu @ 1998-09-26 0:52 UTC (permalink / raw)
To: egcs
Hi,
egcs as of 980925 3pm PDT miscompiled libg++ on Linux/x86. String.cc
is miscompiled. As the result, "make check" failed in libg++. The
miscompiled code looks like
0x400230b7 <Sprepend__FP6StrRepPCci+259>: movl %edi,0xfffffff0(%ebp)
0x400230ba <Sprepend__FP6StrRepPCci+262>: movl 0xfffffff4(%ebp),%edi
0x400230bd <Sprepend__FP6StrRepPCci+265>: movl 0xfffffff0(%ebp),%ecx
0x400230c0 <Sprepend__FP6StrRepPCci+268>: movl 0xfffffffc(%ebp),%edx
0x400230c3 <Sprepend__FP6StrRepPCci+271>: movw %di,(%ecx)
0x400230c6 <Sprepend__FP6StrRepPCci+274>: movl 0xfffffff4(%ebp),%ecx
0x400230c9 <Sprepend__FP6StrRepPCci+277>: addl 0xfffffff8(%ebp),%edx
0x400230cc <Sprepend__FP6StrRepPCci+280>: movl %ecx,%edi
0x400230ce <Sprepend__FP6StrRepPCci+282>: leal 0x4(%edi,%ecx,1),%esi
The correct one should be
0x4002707a <Sprepend__FP6StrRepPCci+258>: movl %edi,0xfffffff0(%ebp)
0x4002707d <Sprepend__FP6StrRepPCci+261>: movl 0xfffffff0(%ebp),%ecx
0x40027080 <Sprepend__FP6StrRepPCci+264>: movl 0xfffffff4(%ebp),%edi
0x40027083 <Sprepend__FP6StrRepPCci+267>: movw %di,(%ecx)
0x40027086 <Sprepend__FP6StrRepPCci+270>: movl 0xfffffffc(%ebp),%edx
0x40027089 <Sprepend__FP6StrRepPCci+273>: movl 0xfffffff4(%ebp),%edi
0x4002708c <Sprepend__FP6StrRepPCci+276>: addl 0xfffffff8(%ebp),%edx
0x4002708f <Sprepend__FP6StrRepPCci+279>: leal 0x4(%ecx,%edi,1),%esi
The problem is with
0x400230c6 <Sprepend__FP6StrRepPCci+274>: movl 0xfffffff4(%ebp),%ecx
0x400230c9 <Sprepend__FP6StrRepPCci+277>: addl 0xfffffff8(%ebp),%edx
0x400230cc <Sprepend__FP6StrRepPCci+280>: movl %ecx,%edi
It clobbered ecx.
--
H.J. Lu (hjl@gnu.org)
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1998-09-26 0:52 egcs egcs-980925 3pm PDT miscompiled libg++ H.J. Lu
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