* [PATCH v3] riscv: Add macros for FPUCW/fcsr in fpu_control.h
@ 2023-04-05 17:51 Shiqi Zhang
0 siblings, 0 replies; only message in thread
From: Shiqi Zhang @ 2023-04-05 17:51 UTC (permalink / raw)
To: libc-alpha; +Cc: schwab, richard.henderson, joseph, Shiqi Zhang
Add macros for rounding modes and accrued exception flags in order to
make controlling fcsr easier for users.
Reference: RISC-V Unprivileged Spec v20191213, Section 11.2: Figure 11.2, Table 11.1 & 11.2
---
Changed naming of rounding modes to make it more consistent across
architectures.
v2: https://sourceware.org/pipermail/libc-alpha/2023-February/145482.html
v1: https://sourceware.org/pipermail/libc-alpha/2023-February/145474.html
Regards,
Shiqi Zhang
sysdeps/riscv/fpu_control.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/sysdeps/riscv/fpu_control.h b/sysdeps/riscv/fpu_control.h
index c33798c6bb..5d36f96984 100644
--- a/sysdeps/riscv/fpu_control.h
+++ b/sysdeps/riscv/fpu_control.h
@@ -36,6 +36,20 @@ extern fpu_control_t __fpu_control;
# define _FPU_DEFAULT 0
# define _FPU_IEEE _FPU_DEFAULT
+/* FPU rounding modes */
+# define _FPU_RC_NEAREST (0 << 5)
+# define _FPU_RC_ZERO (1 << 5)
+# define _FPU_RC_DOWN (2 << 5)
+# define _FPU_RC_UP (3 << 5)
+# define _FPU_RC_NEARESTFROMZERO (4 << 5)
+
+/* FPU accrued exception flags */
+# define _FPU_EXCEPT_NV (1 << 4)
+# define _FPU_EXCEPT_DZ (1 << 3)
+# define _FPU_EXCEPT_OF (1 << 2)
+# define _FPU_EXCEPT_UF (1 << 1)
+# define _FPU_EXCEPT_NX (1 << 0)
+
/* Type of the control word. */
typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__SI__)));
--
2.40.0
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2023-04-05 17:52 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-04-05 17:51 [PATCH v3] riscv: Add macros for FPUCW/fcsr in fpu_control.h Shiqi Zhang
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).