http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41894
--- Comment #12 from Ilya Lesokhin <ilya.lesokhin at gmail dot com> 2011-05-21 14:47:33 UTC --- Created attachment 24319 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24319 simple test case i belive this is the same bug. the problem occurs when using r28,r29 and accesing one of them. as can be seen badCode() doesnt put the value 5 in tester. while goodCode does. void badCode() { a4: ef 92 push r14 a6: ff 92 push r15 a8: cf 93 push r28 aa: df 93 push r29 } t; t.deletedbyte = 5; asm ("" : "+y" (t) :); t.otherbyte = 17; ac: 81 e1 ldi r24, 0x11 ; 17 ae: ec 01 movw r28, r24 asm ("" : "+y" (t) :); tester = t.deletedbyte; b0: 7e 01 movw r14, r28 b2: f0 92 00 01 sts 0x0100, r15 } b6: df 91 pop r29 b8: cf 91 pop r28 ba: ff 90 pop r15 bc: ef 90 pop r14 be: 08 95 ret 000000c0 <goodCode>: void goodCode() { c0: a0 e0 ldi r26, 0x00 ; 0 c2: b5 e0 ldi r27, 0x05 ; 5 } t; t.deletedbyte = 5; asm ("" : "+x" (t) :); t.otherbyte = 17; c4: a1 e1 ldi r26, 0x11 ; 17 asm ("" : "+x" (t) :); tester = t.deletedbyte; c6: b0 93 00 01 sts 0x0100, r27 } ca: 08 95 ret
