I'm pretty sure that this is needed for "strd r4, [r9], -#8" to work.
We start with 8, add -4 to offset for the 4 that was added (before the
second 32-bit store), negate it as requested yielding -4, add it to
the +4-adjusted offset, and get... net of zero.
--- target-arm/translate.c (revision 163253)
+++ target-arm/translate.c (local)
@@ -391,9 +391,9 @@ static inline void gen_add_datah_offset(
if (insn & (1 << 22)) {
/* immediate */
val = (insn & 0xf) | ((insn >> 4) & 0xf0);
- val += extra;
if (!(insn & (1 << 23)))
val = -val;
+ val += extra;
if (val != 0)
gen_op_addl_T1_im(val);
} else {
--
Daniel Jacobowitz
CodeSourcery
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