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References: <bug-36090-87@http.gcc.gnu.org/bugzilla/>
Subject: [Bug target/36090] [4.3/4.4 Regression] ppc64 cacoshl miscompilation
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------- Comment #1 from jakub at gcc dot gnu dot org  2008-04-30 20:25 -------
This wierdo addressing was created by fwprop2, which replaced:
In insn 40, replacing
 (mem/u/c/i:DI (plus:DI (reg/f:DI 129)
            (const_int 8 [0x8])) [2 S8 A64])
 with (mem/u/c/i:DI (plus:DI (reg:DI 2 2)
            (const:DI (minus:DI (symbol_ref/u:DI ("*.LC1") [flags 0x2])
                    (const:DI (plus:DI (symbol_ref:DI ("*.LCTOC1"))
                            (const_int -8 [0xfffffffffffffff8])))))) [2 S8
A64])
where
(insn 21 20 39 4 t.c:5 (set (reg/f:DI 129)
        (plus:DI (reg:DI 2 2)
            (const:DI (minus:DI (symbol_ref/u:DI ("*.LC1") [flags 0x2])
                    (symbol_ref:DI ("*.LCTOC1")))))) 334 {*movdi_internal64}
(expr_list:REG_DEAD (reg:DI 2 2)
        (expr_list:REG_EQUAL (symbol_ref/u:DI ("*.LC1") [flags 0x2])
            (nil))))


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36090