Upgrade libcompiler_rt to upstream revision 147390.

This version of libcompiler_rt adds support for __mulo[sdt]i4(), which
computes a multiply and its overflow flag. There are also a lot of
cleanup fixes to headers that don't really affect us.

Updating to this revision should make it a bit easier to contribute
changes back to the LLVM developers.

1 files changed, 67 insertions, 0 deletions

diff --git a/contrib/compiler-rt/lib/int_math.h b/contrib/compiler-rt/lib/int_math.h
new file mode 100644
index 0000000..d6b4bda
--- /dev/null
+++ b/contrib/compiler-rt/lib/int_math.h
@@ -0,0 +1,67 @@
+/* ===-- int_math.h - internal math inlines ---------------------------------===
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file is dual licensed under the MIT and the University of Illinois Open
+ * Source Licenses. See LICENSE.TXT for details.
+ *
+ * ===-----------------------------------------------------------------------===
+ *
+ * This file is not part of the interface of this library.
+ *
+ * This file defines substitutes for the libm functions used in some of the
+ * compiler-rt implementations, defined in such a way that there is not a direct
+ * dependency on libm or math.h. Instead, we use the compiler builtin versions
+ * where available. This reduces our dependencies on the system SDK by foisting
+ * the responsibility onto the compiler.
+ *
+ * ===-----------------------------------------------------------------------===
+ */
+
+#ifndef INT_MATH_H
+#define INT_MATH_H
+
+#ifndef __has_builtin
+#  define  __has_builtin(x) 0
+#endif
+
+#define CRT_INFINITY __builtin_huge_valf()
+
+#define crt_isinf(x) __builtin_isinf((x))
+#define crt_isnan(x) __builtin_isnan((x))
+
+/* Define crt_isfinite in terms of the builtin if available, otherwise provide
+ * an alternate version in terms of our other functions. This supports some
+ * versions of GCC which didn't have __builtin_isfinite.
+ */
+#if __has_builtin(__builtin_isfinite)
+#  define crt_isfinite(x) __builtin_isfinite((x))
+#else
+#  define crt_isfinite(x) \
+  __extension__(({ \
+      __typeof((x)) x_ = (x); \
+      !crt_isinf(x_) && !crt_isnan(x_); \
+    }))
+#endif
+
+#define crt_copysign(x, y) __builtin_copysign((x), (y))
+#define crt_copysignf(x, y) __builtin_copysignf((x), (y))
+#define crt_copysignl(x, y) __builtin_copysignl((x), (y))
+
+#define crt_fabs(x) __builtin_fabs((x))
+#define crt_fabsf(x) __builtin_fabsf((x))
+#define crt_fabsl(x) __builtin_fabsl((x))
+
+#define crt_fmax(x, y) __builtin_fmax((x), (y))
+#define crt_fmaxf(x, y) __builtin_fmaxf((x), (y))
+#define crt_fmaxl(x, y) __builtin_fmaxl((x), (y))
+
+#define crt_logb(x) __builtin_logb((x))
+#define crt_logbf(x) __builtin_logbf((x))
+#define crt_logbl(x) __builtin_logbl((x))
+
+#define crt_scalbn(x, y) __builtin_scalbn((x), (y))
+#define crt_scalbnf(x, y) __builtin_scalbnf((x), (y))
+#define crt_scalbnl(x, y) __builtin_scalbnl((x), (y))
+
+#endif /* INT_MATH_H */