Protect against overflows in leaq N(src), dst
#407
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If N does not fit in signed 32 bits, `leaq` cannot be used and `mov; addq` must be used instead. This was already the case for `leaq` instructions produced by the Asmgen pass, but not for some `leaq` instructions produced by Asmexpand. Normally, assemblers should fail if the `leaq` offset is not representable, but this is not always the case (see issue #406). Fixes: #406
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If N does not fit in signed 32 bits,
leaqcannot be used andmov; addqmust be used instead.This was already the case for
leaqinstructions produced by the Asmgen pass, but not for someleaqinstructions produced by Asmexpand.Normally, assemblers should fail if the
leaqoffset is not representable, but this is not always the case (see issue #406).Fixes: #406