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authorRaphael Moreira Zinsly <rzinsly@linux.ibm.com>2021-02-25 09:58:52 -0300
committerRaphael Moreira Zinsly <rzinsly@linux.ibm.com>2021-03-16 12:19:09 -0300
commita7d88506c260e7a0e4268803e76fc19e38ed041f (patch)
treed73cedc44f37c0e81e5a5416209929f3d3c979b5
parent56c81132ccc6f468fa4fc29c536db060e18e9d87 (diff)
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powerpc: Add optimized llogb* for POWER9
The POWER9 builtins used to improve the ilogb* functions can be used in the llogb* functions as well.
-rw-r--r--sysdeps/powerpc/powerpc64/le/fpu/w_llogb_template.c39
-rw-r--r--sysdeps/powerpc/powerpc64/le/fpu/w_llogbl.c4
2 files changed, 43 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/le/fpu/w_llogb_template.c b/sysdeps/powerpc/powerpc64/le/fpu/w_llogb_template.c
new file mode 100644
index 0000000000..d00b71d2a3
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/le/fpu/w_llogb_template.c
@@ -0,0 +1,39 @@
+#include <math.h>
+#include <errno.h>
+#include <limits.h>
+#include <math_private.h>
+#include <fenv.h>
+
+#if _GL_HAS_BUILTIN_ILOGB
+long int
+M_DECL_FUNC (__llogb) (FLOAT x)
+{
+ int r;
+ /* Check for exceptional cases. */
+ if (! M_SUF(__builtin_test_dc_ilogb) (x, 0x7f))
+ r = M_SUF (__builtin_ilogb) (x);
+ else
+ /* Fallback to the generic ilogb if x is NaN, Inf or subnormal. */
+ r = M_SUF (__ieee754_ilogb) (x);
+ long int lr = r;
+ if (__glibc_unlikely (r == FP_ILOGB0)
+ || __glibc_unlikely (r == FP_ILOGBNAN)
+ || __glibc_unlikely (r == INT_MAX))
+ {
+#if LONG_MAX != INT_MAX
+ if (r == FP_ILOGB0)
+ lr = FP_LLOGB0;
+ else if (r == FP_ILOGBNAN)
+ lr = FP_LLOGBNAN;
+ else
+ lr = LONG_MAX;
+#endif
+ __set_errno (EDOM);
+ __feraiseexcept (FE_INVALID);
+ }
+ return lr;
+}
+declare_mgen_alias (__llogb, llogb)
+#else
+#include <math/w_llogb_template.c>
+#endif
diff --git a/sysdeps/powerpc/powerpc64/le/fpu/w_llogbl.c b/sysdeps/powerpc/powerpc64/le/fpu/w_llogbl.c
new file mode 100644
index 0000000000..69477a37ae
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/le/fpu/w_llogbl.c
@@ -0,0 +1,4 @@
+/* Skip the optimization for long double as ibm128 does not provide an
+ optimized builtin. */
+#include <math-type-macros-ldouble.h>
+#include <math/w_llogb_template.c>