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| author | aoliva <aoliva@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-02-03 06:01:40 +0000 |
|---|---|---|
| committer | aoliva <aoliva@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-02-03 06:01:40 +0000 |
| commit | 4f2bfa26e4630b905c43dd852395b2d5047d388c (patch) | |
| tree | 24e9cf0f5046d167fed3c35adba388143c7ffc46 | |
| parent | a501acdaaacf5f3b1fa97242ff4f38cc1d87553d (diff) | |
| download | gcc-4f2bfa26e4630b905c43dd852395b2d5047d388c.tar.gz | |
gcc/ChangeLog:
PR tree-optimization/45122
* tree-ssa-loop-niter.c (number_of_iterations_exit): Don't make
unsafe assumptions when there's more than one loop exit.
gcc/testsuite/ChangeLog:
PR tree-optimization/45122
* gcc.dg/tree-ssa/pr45122.c: New.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@169781 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/pr45122.c | 50 | ||||
| -rw-r--r-- | gcc/tree-ssa-loop-niter.c | 2 |
4 files changed, 62 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 1f16f47ea8d..de9d846b7d3 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2011-02-03 Alexandre Oliva <aoliva@redhat.com> + + PR tree-optimization/45122 + * tree-ssa-loop-niter.c (number_of_iterations_exit): Don't make + unsafe assumptions when there's more than one loop exit. + 2011-02-02 Michael Meissner <meissner@linux.vnet.ibm.com> PR target/47272 diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index de8cec78888..69da9d62bd8 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2011-02-03 Alexandre Oliva <aoliva@redhat.com> + + PR tree-optimization/45122 + * gcc.dg/tree-ssa/pr45122.c: New. + 2011-02-02 Michael Meissner <meissner@linux.vnet.ibm.com> PR target/47272 diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr45122.c b/gcc/testsuite/gcc.dg/tree-ssa/pr45122.c new file mode 100644 index 00000000000..e979b766fea --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr45122.c @@ -0,0 +1,50 @@ +/* PR tree-optimization/27285 */ +/* PR tree-optimization/45122 */ + +/* { dg-do run } */ +/* { dg-options "-O2 -funsafe-loop-optimizations" } */ + +extern void abort (void); + +struct S { unsigned char a, b, c, d[16]; }; + +void __attribute__ ((noinline)) +foo (struct S *x, struct S *y) +{ + int a, b; + unsigned char c, *d, *e; + + b = x->b; + d = x->d; + e = y->d; + a = 0; + while (b) + { + if (b >= 8) + { + c = 0xff; + b -= 8; + } + else + { + c = 0xff << (8 - b); + b = 0; + } + + e[a] = d[a] & c; + a++; + } +} + +int +main (void) +{ + struct S x = { 0, 25, 0, { 0xaa, 0xbb, 0xcc, 0xdd }}; + struct S y = { 0, 0, 0, { 0 }}; + + foo (&x, &y); + if (x.d[0] != y.d[0] || x.d[1] != y.d[1] + || x.d[2] != y.d[2] || (x.d[3] & 0x80) != y.d[3]) + abort (); + return 0; +} diff --git a/gcc/tree-ssa-loop-niter.c b/gcc/tree-ssa-loop-niter.c index ee85f6fe006..c14e13c7248 100644 --- a/gcc/tree-ssa-loop-niter.c +++ b/gcc/tree-ssa-loop-niter.c @@ -1890,7 +1890,7 @@ number_of_iterations_exit (struct loop *loop, edge exit, /* With -funsafe-loop-optimizations we assume that nothing bad can happen. But if we can prove that there is overflow or some other source of weird behavior, ignore the loop even with -funsafe-loop-optimizations. */ - if (integer_zerop (niter->assumptions)) + if (integer_zerop (niter->assumptions) || !single_exit (loop)) return false; if (flag_unsafe_loop_optimizations) |