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2017-06-27 Segher Boessenkool <segher@kernel.crashing.org>
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Backport from trunk
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2017-05-17 Segher Boessenkool <segher@kernel.crashing.org>
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PR middle-end/80692
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* real.c (do_compare): Give decimal_do_compare preference over
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comparing just the signs.
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* gcc.c-torture/execute/pr80692.c: New testcase.
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--- gcc/real.c
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+++ gcc/real.c
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@@ -950,12 +950,12 @@ do_compare (const REAL_VALUE_TYPE *a, const REAL_VALUE_TYPE *b,
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gcc_unreachable ();
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}
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- if (a->sign != b->sign)
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- return -a->sign - -b->sign;
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-
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if (a->decimal || b->decimal)
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return decimal_do_compare (a, b, nan_result);
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+ if (a->sign != b->sign)
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+ return -a->sign - -b->sign;
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+
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if (REAL_EXP (a) > REAL_EXP (b))
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ret = 1;
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else if (REAL_EXP (a) < REAL_EXP (b))
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--- /dev/null
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+++ gcc/testsuite/gcc.c-torture/execute/pr80692.c
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@@ -0,0 +1,11 @@
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+int main () {
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+ _Decimal64 d64 = -0.DD;
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+
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+ if (d64 != 0.DD)
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+ __builtin_abort ();
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+
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+ if (d64 != -0.DD)
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+ __builtin_abort ();
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+
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+ return 0;
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+}
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--- /dev/null
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+++ gcc/testsuite/gcc.c-torture/execute/pr80692.x
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@@ -0,0 +1,7 @@
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+load_lib target-supports.exp
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+
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+if { ! [check_effective_target_dfp] } {
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+ return 1
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+}
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+
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+return 0
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