From d28cd0ad428d63c186003fdf9c02470561650a04 Mon Sep 17 00:00:00 2001
From: Szabolcs Nagy <nsz@port70.net>
Date: Sun, 22 Oct 2017 18:32:47 +0000
Subject: math: new powf

from https://github.com/ARM-software/optimized-routines,
commit 04884bd04eac4b251da4026900010ea7d8850edc

POWF_SCALE != 1.0 case only matters if TOINT_INTRINSICS is set, which
is currently not supported for any target.

SNaN is not supported, it would require an issignalingf
implementation.

code size change: -816 bytes.
benchmark on x86_64 before, after, speedup:

-Os:
  powf rthruput:  95.14 ns/call 20.04 ns/call 4.75x
   powf latency: 137.00 ns/call 34.98 ns/call 3.92x
-O3:
  powf rthruput:  92.48 ns/call 13.67 ns/call 6.77x
   powf latency: 131.11 ns/call 35.15 ns/call 3.73x
---
 src/internal/libm.h | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/internal')

diff --git a/src/internal/libm.h b/src/internal/libm.h
index 98bf5c68..9cd105fc 100644
--- a/src/internal/libm.h
+++ b/src/internal/libm.h
@@ -64,6 +64,12 @@ union ldshape {
 /* Support signaling NaNs.  */
 #define WANT_SNAN 0
 
+#if WANT_SNAN
+#error SNaN is unsupported
+#else
+#define issignalingf_inline(x) 0
+#endif
+
 #ifndef TOINT_INTRINSICS
 #define TOINT_INTRINSICS 0
 #endif
-- 
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