[tree-ssa] mainline merge as of 2004-04-10

[Diego Novillo]

Two new regressions.

New regressions in 00testsuite-linux-gnu/20040413/gcc.sum.gz:
         FAIL: gcc.c-torture/execute/bcp-1.c execution
         FAIL: gcc.dg/torture/builtin-ctype-1.c (test for excess errors)


One is the usual builtin stuff not handled at the tree level.  This one
I'm leaving alone because the whole thing needs to be rethought (post
merge).

The bcp-1.c failure is interesting.  We fail it at -Os because of

       * opts.c (decode_options): Do function inlining with very small
       max-inline-insns-* parameters when optimizing for size.

We now refuse to inline at -Os when we predict more than 5
instructions.  In this case, we are predicting 12.  The function is 'foo
(x) { return __builtin_constant_p (x); }'  which, inlined, is 'return
1;'.  I'm not sure if we need to tweak the predictor or
max-inline-insns-* for -Os.  Jan?


Bootstrapped and tested x86, ia64, alpha, ppc and x86-64.


Diego.