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-rw-r--r--mesalib/src/util/Makefile.am4
-rw-r--r--mesalib/src/util/Makefile.sources1
-rw-r--r--mesalib/src/util/macros.h14
-rw-r--r--mesalib/src/util/roundeven_test.c140
-rw-r--r--mesalib/src/util/rounding.h78
-rw-r--r--mesalib/src/util/u_atomic.h2
6 files changed, 233 insertions, 6 deletions
diff --git a/mesalib/src/util/Makefile.am b/mesalib/src/util/Makefile.am
index ec49dc6cf..2e7542e42 100644
--- a/mesalib/src/util/Makefile.am
+++ b/mesalib/src/util/Makefile.am
@@ -50,7 +50,9 @@ endif
libmesautil_la_LIBADD = $(SHA1_LIBS)
-check_PROGRAMS = u_atomic_test
+roundeven_test_LDADD = -lm
+
+check_PROGRAMS = u_atomic_test roundeven_test
TESTS = $(check_PROGRAMS)
BUILT_SOURCES = $(MESA_UTIL_GENERATED_FILES)
diff --git a/mesalib/src/util/Makefile.sources b/mesalib/src/util/Makefile.sources
index 560ea836a..3e0d02bad 100644
--- a/mesalib/src/util/Makefile.sources
+++ b/mesalib/src/util/Makefile.sources
@@ -14,6 +14,7 @@ MESA_UTIL_FILES := \
register_allocate.h \
rgtc.c \
rgtc.h \
+ rounding.h \
set.c \
set.h \
simple_list.h \
diff --git a/mesalib/src/util/macros.h b/mesalib/src/util/macros.h
index b862bfd5f..6c7bda7ae 100644
--- a/mesalib/src/util/macros.h
+++ b/mesalib/src/util/macros.h
@@ -73,15 +73,13 @@ do { \
assert(!str); \
__builtin_unreachable(); \
} while (0)
-#elif _MSC_VER >= 1200
+#elif defined (_MSC_VER)
#define unreachable(str) \
do { \
assert(!str); \
__assume(0); \
} while (0)
-#endif
-
-#ifndef unreachable
+#else
#define unreachable(str) assert(!str)
#endif
@@ -99,7 +97,7 @@ do { \
#define assume(expr) ((expr) ? ((void) 0) \
: (assert(!"assumption failed"), \
__builtin_unreachable()))
-#elif _MSC_VER >= 1200
+#elif defined (_MSC_VER)
#define assume(expr) __assume(expr)
#else
#define assume(expr) assert(expr)
@@ -178,5 +176,11 @@ do { \
# endif
#endif
+#ifdef HAVE_FUNC_ATTRIBUTE_UNUSED
+#define UNUSED __attribute__((unused))
+#else
+#define UNUSED
+#endif
+
#endif /* UTIL_MACROS_H */
diff --git a/mesalib/src/util/roundeven_test.c b/mesalib/src/util/roundeven_test.c
new file mode 100644
index 000000000..7526db1f3
--- /dev/null
+++ b/mesalib/src/util/roundeven_test.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+#include <math.h>
+
+#include "macros.h"
+#include "rounding.h"
+
+int main(int argc, char *argv[])
+{
+ const struct {
+ float input, expected;
+ } float_data[] = {
+ { 0.0, 0.0 },
+ { nextafterf(0.5, 0.0), 0.0 },
+ { 0.5, 0.0 },
+ { nextafterf(0.5, 1.0), 1.0 },
+ { 1.0, 1.0 },
+ { nextafterf(1.5, 1.0), 1.0 },
+ { 1.5, 2.0 },
+ { nextafterf(1.5, 2.0), 2.0 },
+ { 2.0, 2.0 },
+ { nextafterf(2.5, 2.0), 2.0 },
+ { 2.5, 2.0 },
+ { nextafterf(2.5, 3.0), 3.0 },
+ };
+
+ const struct {
+ double input, expected;
+ } double_data[] = {
+ { 0.0, 0.0 },
+ { nextafter(0.5, 0.0), 0.0 },
+ { 0.5, 0.0 },
+ { nextafter(0.5, 1.0), 1.0 },
+ { 1.0, 1.0 },
+ { nextafter(1.5, 1.0), 1.0 },
+ { 1.5, 2.0 },
+ { nextafter(1.5, 2.0), 2.0 },
+ { 2.0, 2.0 },
+ { nextafter(2.5, 2.0), 2.0 },
+ { 2.5, 2.0 },
+ { nextafter(2.5, 3.0), 3.0 },
+ };
+
+ bool failed = false;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(float_data); i++) {
+ float output = _mesa_roundevenf(float_data[i].input);
+ if (memcmp(&float_data[i].expected, &output, sizeof(float))) {
+ fprintf(stderr, "%d float: expected %f (%a) from "
+ "_mesa_roundevenf(%f (%a)) but got %f (%a)\n",
+ i,
+ float_data[i].expected,
+ float_data[i].expected,
+ float_data[i].input,
+ float_data[i].input,
+ output,
+ output);
+ failed = true;
+ }
+ }
+
+ /* Test negated values */
+ for (i = 0; i < ARRAY_SIZE(float_data); i++) {
+ float output = _mesa_roundevenf(-float_data[i].input);
+ float negated_expected = -float_data[i].expected;
+ if (memcmp(&negated_expected, &output, sizeof(float))) {
+ fprintf(stderr, "%d float: expected %f (%a) from "
+ "_mesa_roundevenf(%f (%a)) but got %f (%a)\n",
+ i,
+ negated_expected,
+ negated_expected,
+ -float_data[i].input,
+ -float_data[i].input,
+ output,
+ output);
+ failed = true;
+ }
+ }
+
+ for (i = 0; i < ARRAY_SIZE(double_data); i++) {
+ double output = _mesa_roundeven(double_data[i].input);
+ if (memcmp(&double_data[i].expected, &output, sizeof(double))) {
+ fprintf(stderr, "%d double: expected %f (%a) from "
+ "_mesa_roundeven(%f (%a)) but got %f (%a)\n",
+ i,
+ double_data[i].expected,
+ double_data[i].expected,
+ double_data[i].input,
+ double_data[i].input,
+ output,
+ output);
+ failed = true;
+ }
+ }
+
+ /* Test negated values */
+ for (i = 0; i < ARRAY_SIZE(double_data); i++) {
+ double output = _mesa_roundeven(-double_data[i].input);
+ double negated_expected = -double_data[i].expected;
+ if (memcmp(&negated_expected, &output, sizeof(double))) {
+ fprintf(stderr, "%d double: expected %f (%a) from "
+ "_mesa_roundeven(%f (%a)) but got %f (%a)\n",
+ i,
+ negated_expected,
+ negated_expected,
+ -double_data[i].input,
+ -double_data[i].input,
+ output,
+ output);
+ failed = true;
+ }
+ }
+
+ return failed;
+}
diff --git a/mesalib/src/util/rounding.h b/mesalib/src/util/rounding.h
new file mode 100644
index 000000000..0cbe9269f
--- /dev/null
+++ b/mesalib/src/util/rounding.h
@@ -0,0 +1,78 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <math.h>
+
+#ifdef __SSE4_1__
+#include <smmintrin.h>
+#endif
+
+/* The C standard library has functions round()/rint()/nearbyint() that round
+ * their arguments according to the rounding mode set in the floating-point
+ * control register. While there are trunc()/ceil()/floor() functions that do
+ * a specific operation without modifying the rounding mode, there is no
+ * roundeven() in any version of C.
+ *
+ * Technical Specification 18661 (ISO/IEC TS 18661-1:2014) adds roundeven(),
+ * but it's unfortunately not implemented by glibc.
+ *
+ * This implementation differs in that it does not raise the inexact exception.
+ *
+ * We use rint() to implement these functions, with the assumption that the
+ * floating-point rounding mode has not been changed from the default Round
+ * to Nearest.
+ */
+
+/**
+ * \brief Rounds \c x to the nearest integer, with ties to the even integer.
+ */
+static inline float
+_mesa_roundevenf(float x)
+{
+#ifdef __SSE4_1__
+ float ret;
+ __m128 m = _mm_load_ss(&x);
+ m = _mm_round_ss(m, m, _MM_FROUND_CUR_DIRECTION | _MM_FROUND_NO_EXC);
+ _mm_store_ss(&ret, m);
+ return ret;
+#else
+ return rintf(x);
+#endif
+}
+
+/**
+ * \brief Rounds \c x to the nearest integer, with ties to the even integer.
+ */
+static inline double
+_mesa_roundeven(double x)
+{
+#ifdef __SSE4_1__
+ double ret;
+ __m128d m = _mm_load_sd(&x);
+ m = _mm_round_sd(m, m, _MM_FROUND_CUR_DIRECTION | _MM_FROUND_NO_EXC);
+ _mm_store_sd(&ret, m);
+ return ret;
+#else
+ return rint(x);
+#endif
+}
diff --git a/mesalib/src/util/u_atomic.h b/mesalib/src/util/u_atomic.h
index d15398e1e..e38395ac6 100644
--- a/mesalib/src/util/u_atomic.h
+++ b/mesalib/src/util/u_atomic.h
@@ -6,6 +6,8 @@
*
*/
+#include "no_extern_c.h"
+
#ifndef U_ATOMIC_H
#define U_ATOMIC_H
generated by cgit v1.2.3 (git 2.25.1) at 2025-01-18 08:51:47 +0000