[Bug middle-end/24750] [4.1 regression] global-alloc (reload) trips over own confusion for unexpected addressing modes

[hp at gcc dot gnu dot org]

------- Comment #2 from hp at gcc dot gnu dot org  2005-11-09 02:30 -------
Created an attachment (id=10182)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=10182&action=view)
Compile with -Os

Note the brittleness of the test-case.  Apparently there's a bug, PR 20656,
causing the empty, seemingly-reducible, sometimes redundant for-loops aren't
gone when RTL is generated and can't be replaced with a single assignment
without causing the test-case to PASS.  For example,
the "for (i = 1; i <= u0; i++) { }" loop can't be removed.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24750