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commit 4997e8f31e7415652c3dedec672c0e9bf8caa9ca
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Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Date: Fri Feb 1 10:39:57 2019 -0200
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math: Enable some math builtins for clang
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This patch enable the builtin usage for clang for the C99 functions
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fpclassify, isfinite, isnormal, isnan, isinf, and sigbit. This allows
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clang optimize the calls on frontend instead of call the appropriate
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glibc symbols.
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Checked on aarch64-linux-gnu and x86_64-linux-gnu. I checked the supported
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version for each builtin based on released version from clang/llvm.
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* math/math.h (fpclassify, isfinite, isnormal, isnan): Use builtin for
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clang 2.8.
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(signbit): Use builtin for clang 3.3.
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(isinf): Use builtin for clang 3.7.
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diff --git a/math/math.h b/math/math.h
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index ddee4e408389722f..b3b414f3678e91f7 100644
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--- a/math/math.h
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+++ b/math/math.h
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@@ -874,7 +874,8 @@ enum
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the __SUPPORT_SNAN__ check may be skipped for those versions. */
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/* Return number of classification appropriate for X. */
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-# if __GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__ \
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+# if ((__GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__) \
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+ || __glibc_clang_prereq (2,8)) \
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&& (!defined __OPTIMIZE_SIZE__ || defined __cplusplus)
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/* The check for __cplusplus allows the use of the builtin, even
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when optimization for size is on. This is provided for
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@@ -889,7 +890,7 @@ enum
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# endif
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/* Return nonzero value if sign of X is negative. */
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-# if __GNUC_PREREQ (6,0)
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+# if __GNUC_PREREQ (6,0) || __glibc_clang_prereq (3,3)
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# define signbit(x) __builtin_signbit (x)
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# elif defined __cplusplus
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/* In C++ mode, __MATH_TG cannot be used, because it relies on
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@@ -907,14 +908,16 @@ enum
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# endif
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/* Return nonzero value if X is not +-Inf or NaN. */
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-# if __GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__
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+# if (__GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__) \
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+ || __glibc_clang_prereq (2,8)
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# define isfinite(x) __builtin_isfinite (x)
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# else
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# define isfinite(x) __MATH_TG ((x), __finite, (x))
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# endif
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/* Return nonzero value if X is neither zero, subnormal, Inf, nor NaN. */
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-# if __GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__
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+# if (__GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__) \
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+ || __glibc_clang_prereq (2,8)
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# define isnormal(x) __builtin_isnormal (x)
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# else
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# define isnormal(x) (fpclassify (x) == FP_NORMAL)
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@@ -922,7 +925,8 @@ enum
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/* Return nonzero value if X is a NaN. We could use `fpclassify' but
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we already have this functions `__isnan' and it is faster. */
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-# if __GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__
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+# if (__GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__) \
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+ || __glibc_clang_prereq (2,8)
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# define isnan(x) __builtin_isnan (x)
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# else
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# define isnan(x) __MATH_TG ((x), __isnan, (x))
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@@ -939,7 +943,8 @@ enum
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# define isinf(x) \
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(__builtin_types_compatible_p (__typeof (x), _Float128) \
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? __isinff128 (x) : __builtin_isinf_sign (x))
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-# elif __GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__
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+# elif (__GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__) \
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+ || __glibc_clang_prereq (3,7)
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# define isinf(x) __builtin_isinf_sign (x)
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# else
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# define isinf(x) __MATH_TG ((x), __isinf, (x))
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