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Re: List of simplifications we should perform




On Fri, 11 May 2001, Toon Moene wrote:

> Richard Earnshaw wrote:
>
> > > Then it looks like a bug, since clearly
> > >
> > >       x + !!j != x + j
> > >
> > > Just consider j = 2
>
> Dan replied:
>
> > Likely.
> > As I said, I just took the list from the comments, and verified
> > the rules they are printing out when they do each simplification
> > matches the comments (IE they print out what the simplifier is
> > doing), to avoid single typos that may have been made.
>
> > Dunno if the simplifier is new to pro64, or if it's in the 7.x
> > compilers as well.
>
> > If it's new to pro64, it would help explain why nobody's noticed
> > yet.
>
> Well, it DTRT for me:
>
> $ uname -a
> IRIX bgwd73 6.5 04151556 IP32
> $cat a.c
> #include <stdio.h>
>
> main()
> {
>         int j = 2;
>         printf("%d\n", !!j);
> }
> $ cc -v -O2 a.c
> /usr/lib32/cmplrs/fec -G8 -DMIPSEB -D_MIPSEB -TENV:PIC -D_PIC -D__DSO__
> -Ac=xansi -D__EXTENSIONS__ -D__INLINE_INTRINSICS
> -D__MATH_HAS_NO_SIDE_EFFECTS -DLANGUAGE_C -Dmips -Dunix -Dsgi
> -Dhost_mips -D_SGI_SOURCE -D_LONGLONG -D_SVR4_SOURCE -D_LANGUAGE_C
> -D_MODERN_C -D__sgi -D__host_mips -Amachine(mips) -D_SYSTYPE_SVR4
> -D__unix -Asystem(unix) -D_COMPILER_VERSION=721 -m1 -O2 -show -D__mips=4
> -D_MIPS_ISA=4 -D_ABIN32=2 -D_MIPS_SIM=_ABIN32 -D_MIPS_FPSET=32
> -D_MIPS_SZINT=32 -D_MIPS_SZLONG=32 -D_MIPS_SZPTR=32
> -TARG:abi=n32:isa=mips4 -TARG:proc=r5000 -I/usr/include
> -FE:cmdline=/tmp/ctmL.AAAa007WQ -fB,/tmp/ctmB.BAAa007WQ a.c
> Compiling main
> /usr/lib32/cmplrs/be -PHASE:w:c -G8 -TENV:PIC -m1 -O2 -show
> -TARG:abi=n32:isa=mips4 -TARG:proc=r5000 -LANG:=ansi_c
> -TARG:t5_ll_sc_bug=on -fB,/tmp/ctmB.BAAa007WQ -fo,a.o a.c
> Compiling a.c (/tmp/ctmB.BAAa007WQ) -- Back End
> Compiling main(0)
>
> /usr/lib32/cmplrs/ld32 -call_shared -no_unresolved -transitive_link -elf
> -_SYSTYPE_SVR4 -show -mips4 -n32 -L/usr/lib32/mips4/r5000
> -L/usr/lib32/mips4 -L/usr/lib32 -nocount /usr/lib32/mips4/crt1.o -count
> a.o -nocount -dont_warn_unused -Bdynamic -lc /usr/lib32/mips4/crtn.o
> -warn_unused
> (null): INFO 152: /usr/lib32/cmplrs/ld32.
> $ ./a.out
> 1
>
> [ Note the -D_COMPILER_VERSION=721 ]
>

This makes it a pro64 bug, then.

--Dan


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