re PR tree-optimization/84235 (Miscompilation of floating point code by dom2)
PR tree-optimization/84235 * tree-ssa-scopedtables.c (avail_exprs_stack::simplify_binary_operation): Fir MINUS_EXPR, punt if the subtraction is performed in floating point type where NaNs are honored. For *DIV_EXPR, punt for ALL_FRACT_MODE_Ps where we can't build 1. Formatting fix. * gcc.c-torture/execute/ieee/pr84235.c: New test. From-SVN: r257437
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2018-02-07 Jakub Jelinek <jakub@redhat.com>
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PR tree-optimization/84235
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* tree-ssa-scopedtables.c
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(avail_exprs_stack::simplify_binary_operation): Fir MINUS_EXPR, punt
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if the subtraction is performed in floating point type where NaNs are
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honored. For *DIV_EXPR, punt for ALL_FRACT_MODE_Ps where we can't
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build 1. Formatting fix.
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2018-02-06 Jakub Jelinek <jakub@redhat.com>
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PR target/84146
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@ -1,3 +1,8 @@
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2018-02-07 Jakub Jelinek <jakub@redhat.com>
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PR tree-optimization/84235
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* gcc.c-torture/execute/ieee/pr84235.c: New test.
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2018-02-07 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
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PR testsuite/84243
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/* PR tree-optimization/84235 */
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int
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main ()
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{
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double d = 1.0 / 0.0;
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_Bool b = d == d && (d - d) != (d - d);
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if (!b)
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__builtin_abort ();
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return 0;
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}
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@ -182,8 +182,15 @@ avail_exprs_stack::simplify_binary_operation (gimple *stmt,
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case BIT_AND_EXPR:
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return gimple_assign_rhs1 (stmt);
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case BIT_XOR_EXPR:
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case MINUS_EXPR:
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/* This is unsafe for certain floats even in non-IEEE
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formats. In IEEE, it is unsafe because it does
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wrong for NaNs. */
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if (FLOAT_TYPE_P (result_type)
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&& HONOR_NANS (result_type))
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break;
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/* FALLTHRU */
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case BIT_XOR_EXPR:
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case TRUNC_MOD_EXPR:
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case CEIL_MOD_EXPR:
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case FLOOR_MOD_EXPR:
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@ -195,6 +202,9 @@ avail_exprs_stack::simplify_binary_operation (gimple *stmt,
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case FLOOR_DIV_EXPR:
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case ROUND_DIV_EXPR:
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case EXACT_DIV_EXPR:
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/* Avoid _Fract types where we can't build 1. */
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if (ALL_FRACT_MODE_P (TYPE_MODE (result_type)))
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break;
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return build_one_cst (result_type);
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default:
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@ -204,8 +214,8 @@ avail_exprs_stack::simplify_binary_operation (gimple *stmt,
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break;
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}
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default:
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break;
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default:
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break;
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}
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}
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}
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