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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [testsuite/] [gcc.target/] [avr/] [pr46779-2.c] - Rev 753
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/* { dg-do run } */ /* { dg-options "-Os -fno-split-wide-types" } */ /* This testcase should uncover bugs like PR46779 PR45291 PR41894 The inline asm just serves to direct y into the Y register. Otherwise, it is hard to write a "stable" test case that also fails with slight variations in source code, middle- resp. backend. The problem is that Y is also the frame-pointer, and avr.c:avr_hard_regno_mode_ok disallows QI to get in Y-reg. However, the y.a = 0 generates a (set (subreg:QI (reg:HI pseudo)) ...) where pseudo gets allocated to Y. Reload fails to generate the right spill. */ #include <stdlib.h> struct S { unsigned char a, b; } ab = {12, 34}; void yoo (struct S y) { __asm volatile ("ldi %B0, 56" : "+y" (y)); y.a = 0; __asm volatile ("; y = %0" : "+y" (y)); ab = y; } int main () { yoo (ab); if (ab.a != 0) abort(); if (ab.b != 56) abort(); exit (0); return 0; }
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