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Re: [PATCH] PR bootstrap/12269: Fix ia64 bootstrap on mainline


On Mon, Sep 15, 2003 at 04:55:19AM -0600, Roger Sayle wrote:
> 
> 
> My fears were right, the bootstrap failure was caused by a comparison
> mode mismatch, indeed caused by my patch to move NOT/NEG simplifications
> into simplify-rtx.c.  In simplify_unary_operation, when inverting a
> comparison, such as (NOT (EQ X Y)), mode is the mode of the NOT, and
> op_mode is the mode of the EQ.  Neither is the actual mode of the
> comparison!  For gcc.c-torture/execute/builtins/string-3-lib.c, this
> then leads to use simplifying the comparison in BImode, where not
> surprisingly "n < 2" is always true.
> 
> Thanks to the infrastructure added in the unreviewed patch above,
> we can now just pass VOIDmode as the mode of the comparison and
> simplify_gen_relational will work out what to do.  This restores
> bootstrap for me on ia64-unknown-linux-gnu, all languages except
> Ada and treelang, including all the run-time libraries.
> 
> This version of the patch has also been tested on i686-pc-linux-gnu
> with a complete "make bootstrap", all languages except treelang, and
> regression tested with a top-level "make -k check" with no new failures.
> 
> Ok for mainline?

It works.

Linux/ia64:

http://gcc.gnu.org/ml/gcc-testresults/2003-09/msg00561.html

Linux/ia32:

http://gcc.gnu.org/ml/gcc-testresults/2003-09/msg00558.html


H.J.


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