From: Stepan D. <stp...@na...> - 2013-07-28 19:16:54
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> Ok this was a bit insane to reduce but I've found the offending lines. > > The problem is how uint32_t and uint16_t are defined: > typedef unsigned int uint16_t __attribute__ ((__mode__ (__HI__))); > > typedef unsigned int uint32_t __attribute__ ((__mode__ (__SI__))); > > I have no idea what this syntax is, but if you refedefine those types to unsigned int / long the problem goes away. Wow great. Never expected that wrong definition. > > Now im getting an error in llc: error: couldn't allocate input reg for constraint 'r' > Hm.. May be try with O2 instead of Os? > 2013/7/28 Borja Ferrer <bor...@gm...> > >> I've compiled the file you attached, ignoring all warnings i get from clang about the unknown attributes like progmem, i'm getting the assertion "multibyte index is out of range." >> >> 2013/7/28 Borja Ferrer <bor...@gm...> >> >>> Hello Stepan, >>> >>> 1) It seems clang mangles assembly functions names by prefixing a \01 character. I haven't found yet the code that does this depending on the target used. >>> >>> 2) About the code above, I'm assuming you got that inline asm code from the __LPM_dword_classic__ macro. This is what I'm getting for the following C code: >>> typedef unsigned int uint16_t; >>> typedef unsigned long uint32_t; >>> >>> #define __LPM_dword_classic__(addr) \ >>> (__extension__({ \ >>> uint16_t __addr16 = (uint16_t)(addr); \ >>> uint32_t __result; \ >>> __asm__ __volatile__ \ >>> >>> ( \ >>> "lpm" "\n\t" \ >>> "mov %A0, r0" "\n\t" \ >>> "adiw r30, 1" "\n\t" \ >>> >>> "lpm" "\n\t" \ >>> "mov %B0, r0" "\n\t" \ >>> "adiw r30, 1" "\n\t" \ >>> "lpm" "\n\t" \ >>> >>> "mov %C0, r0" "\n\t" \ >>> "adiw r30, 1" "\n\t" \ >>> "lpm" "\n\t" \ >>> "mov %D0, r0" "\n\t" \ >>> >>> : "=r" (__result), "=z" (__addr16) \ >>> : "1" (__addr16) \ >>> : "r0" \ >>> >>> ); \ >>> >>> __result; \ >>> })) >>> unsigned long inlineasm(unsigned int addr) >>> { >>> return __LPM_dword_classic__(addr); >>> } >>> >>> clang produces: >>> >>> define i32 @inlineasm(i16 %addr) #0 { >>> >>> entry: >>> %0 = tail call { i32, i16 } asm sideeffect "lpm\0A\09mov ${0:A}, r0\0A\09adiw r30, 1\0A\09lpm\0A\09mov ${0:B}, r0\0A\09adiw r30, 1\0A\09lpm\0A\09mov ${0:C}, r0\0A\09adiw r30, 1\0A\09lpm\0A\09mov ${0:D}, r0\0A\09", "=r,=z,1,~{r0}"(i16 %addr) #2, !srcloc !4 >>> >>> %asmresult = extractvalue { i32, i16 } %0, 0 >>> ret i32 %asmresult >>> } >>> >>> No truncations here as far i can tell. Try this code and see what you get. -- Truly yours, Stepan Dyatkovskiy |