deef6754b7
Fix folding of BIT_NOT_EXPR for POLY_INT_CST (PR 118976, RHEL-90239) Resolves: RHEL-90239
65 lines
2.2 KiB
Diff
65 lines
2.2 KiB
Diff
Original patch (taken from GCC 12 branch version) edited for GCC 11 to
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use .c rather than .cc filenames.
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commit 587b370c8492aadaab14c57e242c66778cc78891
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Author: Richard Sandiford <richard.sandiford@arm.com>
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Date: Tue Mar 11 15:51:55 2025 +0000
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Fix folding of BIT_NOT_EXPR for POLY_INT_CST [PR118976]
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There was an embarrassing typo in the folding of BIT_NOT_EXPR for
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POLY_INT_CSTs: it used - rather than ~ on the poly_int. Not sure
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how that happened, but it might have been due to the way that
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~x is implemented as -1 - x internally.
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gcc/
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PR tree-optimization/118976
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* fold-const.cc (const_unop): Use ~ rather than - for BIT_NOT_EXPR.
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* config/aarch64/aarch64.cc (aarch64_test_sve_folding): New function.
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(aarch64_run_selftests): Run it.
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(cherry picked from commit 78380fd7f743e23dfdf013d68a2f0347e1511550)
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diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
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index be0d958dcf6b..72d737d62228 100644
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--- a/gcc/config/aarch64/aarch64.c
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+++ b/gcc/config/aarch64/aarch64.c
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@@ -27541,6 +27541,16 @@ aarch64_test_fractional_cost ()
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ASSERT_EQ (cf (1, 2).as_double (), 0.5);
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}
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+/* Test SVE arithmetic folding. */
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+
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+static void
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+aarch64_test_sve_folding ()
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+{
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+ tree res = fold_unary (BIT_NOT_EXPR, ssizetype,
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+ ssize_int (poly_int64 (1, 1)));
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+ ASSERT_TRUE (operand_equal_p (res, ssize_int (poly_int64 (-2, -1))));
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+}
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+
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/* Run all target-specific selftests. */
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static void
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@@ -27548,6 +27558,7 @@ aarch64_run_selftests (void)
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{
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aarch64_test_loading_full_dump ();
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aarch64_test_fractional_cost ();
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+ aarch64_test_sve_folding ();
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}
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} // namespace selftest
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diff --git a/gcc/fold-const.c b/gcc/fold-const.c
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index d81a71c41a17..391f11095408 100644
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--- a/gcc/fold-const.c
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+++ b/gcc/fold-const.c
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@@ -1802,7 +1802,7 @@ const_unop (enum tree_code code, tree type, tree arg0)
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if (TREE_CODE (arg0) == INTEGER_CST)
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return fold_not_const (arg0, type);
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else if (POLY_INT_CST_P (arg0))
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- return wide_int_to_tree (type, -poly_int_cst_value (arg0));
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+ return wide_int_to_tree (type, ~poly_int_cst_value (arg0));
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/* Perform BIT_NOT_EXPR on each element individually. */
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else if (TREE_CODE (arg0) == VECTOR_CST)
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{
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