[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <20240612160612.362246-1-mzh@mzh.io>
Date: Thu, 13 Jun 2024 00:06:12 +0800
From: Meng Zhuo <mzh@....io>
To: musl@...ts.openwall.com
Subject: [PATCH v3] math: add riscv64 round/roundf
---
First of all, sorry for any inconvenience.
This is my first time try to contribute with mail list.
---
v1 -> v3:
* using isfinite to check NaN,+-inf and in range without raising INVALID
* inlined copysign(f)
---
src/math/riscv64/round.c | 20 ++++++++++++++++++++
src/math/riscv64/roundf.c | 20 ++++++++++++++++++++
2 files changed, 40 insertions(+)
create mode 100644 src/math/riscv64/round.c
create mode 100644 src/math/riscv64/roundf.c
diff --git a/src/math/riscv64/round.c b/src/math/riscv64/round.c
new file mode 100644
index 00000000..6d91c093
--- /dev/null
+++ b/src/math/riscv64/round.c
@@ -0,0 +1,20 @@
+#include <math.h>
+
+#if __riscv_flen >= 64
+
+double round(double x)
+{
+ if (!isfinite(x)) return x;
+ double tmp;
+ long long n;
+ __asm__ ("fcvt.l.d %0, %1, rmm" : "=r"(n) : "f"(x));
+ __asm__ ("fcvt.d.l %0, %1" : "=f"(tmp) : "r"(n));
+ __asm__ ("fsgnj.d %0, %1, %2" : "=f"(x) : "f"(tmp), "f"(x));
+ return x;
+}
+
+#else
+
+#include "../round.c"
+
+#endif
diff --git a/src/math/riscv64/roundf.c b/src/math/riscv64/roundf.c
new file mode 100644
index 00000000..e67e791f
--- /dev/null
+++ b/src/math/riscv64/roundf.c
@@ -0,0 +1,20 @@
+#include <math.h>
+
+#if __riscv_flen >= 32
+
+float roundf(float x)
+{
+ if (!isfinite(x)) return x;
+ float tmp;
+ long n;
+ __asm__ ("fcvt.w.s %0, %1, rmm" : "=r"(n) : "f"(x));
+ __asm__ ("fcvt.s.w %0, %1" : "=f"(tmp) : "r"(n));
+ __asm__ ("fsgnj.s %0, %1, %2" : "=f"(x) : "f"(tmp), "f"(x));
+ return x;
+}
+
+#else
+
+#include "../roundf.c"
+
+#endif
--
2.39.2
Powered by blists - more mailing lists
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
