[Bug target/42509] [4.5 Regression] bootstrap failure in stage3 (integer overflow in preprocessor expression)

[rearnsha at gcc dot gnu dot org]

------- Comment #15 from rearnsha at gcc dot gnu dot org  2010-04-01 22:04 -------
In expr.i.194r.dse2 the DImode load insn contains
(insn 4435 4434 5070 176 /home/rearnsha/gnusrc/gcc/trunk/libcpp/expr.c:1281
(set (reg:DI 0 r0)
        (mem/c:DI (reg:SI 1 r1) [87 %sfp+-544 S8 A64])) 587 {*thumb2_movdi_vfp}
(nil))

However, in expr.i.195r.csa it has been converted to
(insn 4435 5240 5070 335 /home/rearnsha/gnusrc/gcc/trunk/libcpp/expr.c:1281
(set (reg:DI 0 r0)
        (mem/c:DI (reg:SI 1 r1) [87 %sfp S8 A64])) 587 {*thumb2_movdi_vfp}
(nil))

This seems to occur when it moves it to a new BB.

There doesn't seem to be an obvious option that disables the csa pass, short of
turning off all optimization.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42509