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avr-llvm / llvm

[MERGED UPSTREAM] AVR backend for the LLVM compiler library
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STS broken on ATtiny10 #215

Open cpldcpu opened 8 years ago

cpldcpu commented 8 years ago

AVR-LLVM generates a 32 bit STS instruction on the ATtiny10, while only the 16 bit one is supported. Also, it appears that the memory map of the ATtiny10 is not implemented correctly.

I suppose this issue is similar to: https://github.com/avr-llvm/llvm/issues/138

Example:

unsigned char global;
void test(void) {
    global=7;
}

Generated code:

   0:   87 e0           ldi r24, 0x07   ; 7
   2:   80 93 00 00     sts 0x0000, r24
   6:   08 95           ret

Probably a low priority issue, but this will break most programs on the avrtiny-core.