69 lines
1.8 KiB
Diff
69 lines
1.8 KiB
Diff
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From e27123a020e7bf0845a9804a4b09fe4ce57992f0 Mon Sep 17 00:00:00 2001
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From: Xi Ruoyao <xry111@xry111.site>
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Date: Tue, 6 Feb 2024 17:49:50 +0800
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Subject: [PATCH 155/188] testsuite: Add a test case for negating FP vectors
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containing zeros
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Recently I've fixed two wrong FP vector negate implementation which
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caused wrong sign bits in zeros in targets (r14-8786 and r14-8801). To
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prevent a similar issue from happening again, add a test case.
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Tested on x86_64 (with SSE2, AVX, AVX2, and AVX512F), AArch64, MIPS
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(with MSA), LoongArch (with LSX and LASX).
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gcc/testsuite:
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* gcc.dg/vect/vect-neg-zero.c: New test.
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---
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gcc/testsuite/gcc.dg/vect/vect-neg-zero.c | 38 +++++++++++++++++++++++
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1 file changed, 38 insertions(+)
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create mode 100644 gcc/testsuite/gcc.dg/vect/vect-neg-zero.c
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diff --git a/gcc/testsuite/gcc.dg/vect/vect-neg-zero.c b/gcc/testsuite/gcc.dg/vect/vect-neg-zero.c
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new file mode 100644
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index 000000000..21fa00cfa
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--- /dev/null
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+++ b/gcc/testsuite/gcc.dg/vect/vect-neg-zero.c
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@@ -0,0 +1,38 @@
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+/* { dg-add-options ieee } */
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+/* { dg-additional-options "-fno-associative-math -fsigned-zeros" } */
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+
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+double x[4] = {-0.0, 0.0, -0.0, 0.0};
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+float y[8] = {-0.0, 0.0, -0.0, 0.0, -0.0, -0.0, 0.0, 0.0};
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+
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+static __attribute__ ((always_inline)) inline void
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+test (int factor)
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+{
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+ double a[4];
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+ float b[8];
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+
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+ asm ("" ::: "memory");
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+
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+ for (int i = 0; i < 2 * factor; i++)
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+ a[i] = -x[i];
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+
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+ for (int i = 0; i < 4 * factor; i++)
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+ b[i] = -y[i];
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+
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+#pragma GCC novector
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+ for (int i = 0; i < 2 * factor; i++)
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+ if (__builtin_signbit (a[i]) == __builtin_signbit (x[i]))
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+ __builtin_abort ();
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+
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+#pragma GCC novector
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+ for (int i = 0; i < 4 * factor; i++)
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+ if (__builtin_signbit (b[i]) == __builtin_signbit (y[i]))
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+ __builtin_abort ();
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+}
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+
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+int
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+main (void)
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+{
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+ test (1);
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+ test (2);
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+ return 0;
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+}
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--
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2.43.0
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