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From: Richard Biener <rguenth@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r12-6513] tree-optimization/76174 - testcase for fixed PR Date: Wed, 12 Jan 2022 07:12:17 +0000 (GMT) [thread overview] Message-ID: <20220112071217.1F1EE389AC74@sourceware.org> (raw) https://gcc.gnu.org/g:45ddb395187f8f5f278880fe1422d8958ac35da6 commit r12-6513-g45ddb395187f8f5f278880fe1422d8958ac35da6 Author: Richard Biener <rguenther@suse.de> Date: Wed Jan 12 08:10:19 2022 +0100 tree-optimization/76174 - testcase for fixed PR This adds a testcase for the fixed PR, VN now gets us the transform via IV equality plus predication. 2022-01-12 Richard Biener <rguenther@suse.de> PR tree-optimization/76174 * gcc.dg/tree-ssa/pr76174.c: New testcase. Diff: --- gcc/testsuite/gcc.dg/tree-ssa/pr76174.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr76174.c b/gcc/testsuite/gcc.dg/tree-ssa/pr76174.c new file mode 100644 index 00000000000..17a4a0faf24 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr76174.c @@ -0,0 +1,22 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-cddce1" } */ + +void foo(); + +void l(unsigned int r) { + unsigned int q = 0; + unsigned int c = r; + for (unsigned int x = 0; x<r; x++) { + if (q == c) { + foo(); + c *= 2; + } + q++; + } +} + +/* We should be able to elide the body of the function by means of + figuring out the equality between the two IVs and then simplifying + the q == c test. */ +/* { dg-final { scan-tree-dump-not "foo" "cddce1" } } */ +/* { dg-final { scan-tree-dump-times "bb" 1 "cddce1" } } */
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