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From: Richard Biener <rguenth@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-1341] tree-optimization/106112 - fix CSE from wider operation Date: Wed, 29 Jun 2022 09:15:05 +0000 (GMT) [thread overview] Message-ID: <20220629091505.DC2E7385C311@sourceware.org> (raw) https://gcc.gnu.org/g:2dbb45d6dc0d20dc159b3d8e27ebb6825074827a commit r13-1341-g2dbb45d6dc0d20dc159b3d8e27ebb6825074827a Author: Richard Biener <rguenther@suse.de> Date: Tue Jun 28 13:57:29 2022 +0200 tree-optimization/106112 - fix CSE from wider operation The following fixes a mistake in looking up an extended operand in the CSE of a truncated operation. 2022-06-28 Richard Biener <rguenther@suse.de> PR tree-optimization/106112 * tree-ssa-sccvn.cc (valueized_wider_op): Properly extend a constant operand according to its type. * gcc.dg/torture/pr106112.c: New testcase. Diff: --- gcc/testsuite/gcc.dg/torture/pr106112.c | 16 ++++++++++++++++ gcc/tree-ssa-sccvn.cc | 2 +- 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/gcc/testsuite/gcc.dg/torture/pr106112.c b/gcc/testsuite/gcc.dg/torture/pr106112.c new file mode 100644 index 00000000000..bd7f63c0935 --- /dev/null +++ b/gcc/testsuite/gcc.dg/torture/pr106112.c @@ -0,0 +1,16 @@ +/* { dg-do run } */ + +__INT32_TYPE__ a = 5, b, c, d; +__UINT64_TYPE__ e = 20862985922; +int main() +{ + __UINT32_TYPE__ f = 4294967292; + e = e | f; + c = -1 % ((~f ^ 4294967292) - (e - d)); + b = ~-~e % ~-d; + if (b) + a = 0; + if (a < 1) + __builtin_abort(); + return 0; +} diff --git a/gcc/tree-ssa-sccvn.cc b/gcc/tree-ssa-sccvn.cc index 5214f142f52..9deedeac378 100644 --- a/gcc/tree-ssa-sccvn.cc +++ b/gcc/tree-ssa-sccvn.cc @@ -4983,7 +4983,7 @@ valueized_wider_op (tree wide_type, tree op, bool allow_truncate) /* For constants simply extend it. */ if (TREE_CODE (op) == INTEGER_CST) - return wide_int_to_tree (wide_type, wi::to_wide (op)); + return wide_int_to_tree (wide_type, wi::to_widest (op)); return NULL_TREE; }
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