1 files changed, 47 insertions, 0 deletions
diff --git a/pl/math/sv_acoshf_2u8.c b/pl/math/sv_acoshf_2u8.c
new file mode 100644
index 000000000000..f527083af40a
--- /dev/null
+++ b/pl/math/sv_acoshf_2u8.c
@@ -0,0 +1,47 @@
+/*
+ * Single-precision SVE acosh(x) function.
+ * Copyright (c) 2023, Arm Limited.
+ * SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception
+ */
+
+#include "sv_math.h"
+#include "pl_sig.h"
+#include "pl_test.h"
+
+#define One 0x3f800000
+#define Thres 0x20000000 /* asuint(0x1p64) - One.  */
+
+#include "sv_log1pf_inline.h"
+
+static svfloat32_t NOINLINE
+special_case (svfloat32_t x, svfloat32_t y, svbool_t special)
+{
+  return sv_call_f32 (acoshf, x, y, special);
+}
+
+/* Single-precision SVE acosh(x) routine. Implements the same algorithm as
+   vector acoshf and log1p.
+
+   Maximum error is 2.78 ULPs:
+   SV_NAME_F1 (acosh) (0x1.01e996p+0) got 0x1.f45b42p-4
+				     want 0x1.f45b3cp-4.  */
+svfloat32_t SV_NAME_F1 (acosh) (svfloat32_t x, const svbool_t pg)
+{
+  svuint32_t ix = svreinterpret_u32 (x);
+  svbool_t special = svcmpge (pg, svsub_x (pg, ix, One), Thres);
+
+  svfloat32_t xm1 = svsub_x (pg, x, 1.0f);
+  svfloat32_t u = svmul_x (pg, xm1, svadd_x (pg, x, 1.0f));
+  svfloat32_t y = sv_log1pf_inline (svadd_x (pg, xm1, svsqrt_x (pg, u)), pg);
+
+  if (unlikely (svptest_any (pg, special)))
+    return special_case (x, y, special);
+  return y;
+}
+
+PL_SIG (SV, F, 1, acosh, 1.0, 10.0)
+PL_TEST_ULP (SV_NAME_F1 (acosh), 2.29)
+PL_TEST_INTERVAL (SV_NAME_F1 (acosh), 0, 1, 500)
+PL_TEST_INTERVAL (SV_NAME_F1 (acosh), 1, 0x1p64, 100000)
+PL_TEST_INTERVAL (SV_NAME_F1 (acosh), 0x1p64, inf, 1000)
+PL_TEST_INTERVAL (SV_NAME_F1 (acosh), -0, -inf, 1000)