diff options
author | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
---|---|---|
committer | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
commit | 1bc5aee63eb72b341f506ad058502cd0361f0d10 (patch) | |
tree | c607e8252f3405424ff15bc2d00aa38dadbb2518 /gcc-4.9/gcc/testsuite/gcc.target/avr/pr46779-1.c | |
parent | 283a0bf58fcf333c58a2a92c3ebbc41fb9eb1fdb (diff) | |
download | toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.gz toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.bz2 toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.zip |
Initial checkin of GCC 4.9.0 from trunk (r208799).
Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba
Diffstat (limited to 'gcc-4.9/gcc/testsuite/gcc.target/avr/pr46779-1.c')
-rw-r--r-- | gcc-4.9/gcc/testsuite/gcc.target/avr/pr46779-1.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/gcc.target/avr/pr46779-1.c b/gcc-4.9/gcc/testsuite/gcc.target/avr/pr46779-1.c new file mode 100644 index 000000000..24522f175 --- /dev/null +++ b/gcc-4.9/gcc/testsuite/gcc.target/avr/pr46779-1.c @@ -0,0 +1,51 @@ +/* { dg-do run } */ +/* { dg-options "-Os -fsplit-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; +} |