diff options
Diffstat (limited to 'gcc/testsuite/gcc.dg/tree-ssa/pr23455.c')
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/pr23455.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr23455.c b/gcc/testsuite/gcc.dg/tree-ssa/pr23455.c new file mode 100644 index 000000000..766dc2b33 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr23455.c @@ -0,0 +1,24 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-pre-stats" } */ +unsigned long outcnt; +extern void flush_outbuf(void); + +void +bi_windup(unsigned int *outbuf, unsigned int bi_buf) +{ + unsigned long t1 = outcnt; + outbuf[t1] = bi_buf; + + unsigned long t2 = outcnt; + if (t2 == 16384) + flush_outbuf(); + + unsigned long t3 = outcnt; + outbuf[t3] = bi_buf; +} +/* We should eliminate one load of outcnt, which will in turn let us eliminate + one multiply of outcnt which will in turn let us eliminate + one add involving outcnt and outbuf. */ +/* { dg-final { scan-tree-dump-times "Eliminated: 3" 1 "pre" {target { ! avr-*-* } } } } */ +/* { dg-final { scan-tree-dump-times "Eliminated: 4" 1 "pre" {target { avr-*-* } } } } */ +/* { dg-final { cleanup-tree-dump "pre" } } */ |