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2013 May 13
0
[LLVMdev] [ARM] Bugs in decode / encode of PC-relative t2 LDR in the ARM backend
...hich seems to always end up being 0 as there is no encoder method to deal with it, so it will happily output a negative-immediate version no matter what the input value. The shifted immediate version of t2LDR has a custom decoder method which handles conversion to a t2LDRpci if Rn == PC, but the t2LDRs case is actually missing from this, only the various other types (B, H, SB, SH) are handled. The ARM manual lists almost all of the LDR variants as "If Rn == pc, See LDR (literal)". So far to work around the decoder issue I've made custom decoder functions for all variants in the T2...