From: Borja F. <bor...@gm...> - 2013-07-28 16:46:29
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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. |