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From: Richard Biener <rguenth@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r9-9211] tree-optimization/97627 - Avoid computing niters for fake edges Date: Fri, 29 Jan 2021 11:51:27 +0000 (GMT) [thread overview] Message-ID: <20210129115127.2040A384B824@sourceware.org> (raw) https://gcc.gnu.org/g:a7e6e7a9299208e5aa3d805d502370d59f92b8b5 commit r9-9211-ga7e6e7a9299208e5aa3d805d502370d59f92b8b5 Author: Richard Biener <rguenther@suse.de> Date: Fri Jan 29 11:17:42 2021 +0100 tree-optimization/97627 - Avoid computing niters for fake edges This avoids computing niters information for fake edges. 2021-01-29 Bin Cheng <bin.cheng@linux.alibaba.com> Richard Biener <rguenther@suse.de> PR tree-optimization/97627 * tree-ssa-loop-niter.c (number_of_iterations_exit_assumptions): Do not analyze fake edges. * g++.dg/pr97627.C: New testcase. (cherry picked from commit 3976b2701b826569ffcd90877d94095def507e3f) Diff: --- gcc/testsuite/g++.dg/pr97627.C | 44 ++++++++++++++++++++++++++++++++++++++++++ gcc/tree-ssa-loop-niter.c | 5 +++++ 2 files changed, 49 insertions(+) diff --git a/gcc/testsuite/g++.dg/pr97627.C b/gcc/testsuite/g++.dg/pr97627.C new file mode 100644 index 00000000000..81466dc3b81 --- /dev/null +++ b/gcc/testsuite/g++.dg/pr97627.C @@ -0,0 +1,44 @@ +/* PR tree-optimization/97627. */ +/* { dg-do run } */ + +struct S { unsigned short x, y; } m = { 1, 0 }; + +__attribute__((noipa)) void +baz (int x, int y) +{ + if (x != 0 || y != 1) + __builtin_abort (); +} + +__attribute__((noipa)) void +bar () +{ + throw 1; +} + +void +foo () +{ + while (1) + { + int a = m.x + 1; + int b = m.y + 1; + for (int c = 0; c < a; c++) + for (int d = 0; d < b; d++) + baz (d, b); + bar (); + } +} + +int +main () +{ + try + { + foo (); + } + catch (int) + { + } + return 0; +} diff --git a/gcc/tree-ssa-loop-niter.c b/gcc/tree-ssa-loop-niter.c index 470b6a295be..200344b42dd 100644 --- a/gcc/tree-ssa-loop-niter.c +++ b/gcc/tree-ssa-loop-niter.c @@ -2382,6 +2382,11 @@ number_of_iterations_exit_assumptions (struct loop *loop, edge exit, affine_iv iv0, iv1; bool safe; + /* The condition at a fake exit (if it exists) does not control its + execution. */ + if (exit->flags & EDGE_FAKE) + return false; + /* Nothing to analyze if the loop is known to be infinite. */ if (loop_constraint_set_p (loop, LOOP_C_INFINITE)) return false;
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