From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org
Subject: [PATCH 12/12] i386: Do not raise inexact exception on trunc/truncf
Date: Thu, 28 Dec 2023 14:20:26 -0300 [thread overview]
Message-ID: <20231228172026.2013007-13-adhemerval.zanella@linaro.org> (raw)
In-Reply-To: <20231228172026.2013007-1-adhemerval.zanella@linaro.org>
It is not allowed anymore on ISO C23.
Checked on x86_64-linux-gnu and i686-linux-gnu.
---
sysdeps/i386/fpu/{s_trunc.S => s_trunc.c} | 37 +++++++++++----------
sysdeps/i386/fpu/{s_truncf.S => s_truncf.c} | 37 +++++++++++----------
2 files changed, 38 insertions(+), 36 deletions(-)
rename sysdeps/i386/fpu/{s_trunc.S => s_trunc.c} (61%)
rename sysdeps/i386/fpu/{s_truncf.S => s_truncf.c} (61%)
diff --git a/sysdeps/i386/fpu/s_trunc.S b/sysdeps/i386/fpu/s_trunc.c
similarity index 61%
rename from sysdeps/i386/fpu/s_trunc.S
rename to sysdeps/i386/fpu/s_trunc.c
index 145288bc8e..b071ad9750 100644
--- a/sysdeps/i386/fpu/s_trunc.S
+++ b/sysdeps/i386/fpu/s_trunc.c
@@ -1,5 +1,5 @@
-/* Truncate double value.
- Copyright (C) 1997-2023 Free Software Foundation, Inc.
+/* Round to integer, toward zero. i386 version.
+ Copyright (C) 2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -16,22 +16,23 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#include <machine/asm.h>
+#define NO_MATH_REDIRECT
+#include <math.h>
+#include <fenv_private.h>
#include <libm-alias-double.h>
-ENTRY(__trunc)
- fldl 4(%esp)
- subl $32, %esp
- cfi_adjust_cfa_offset (32)
- fnstenv 4(%esp)
- movl $0xc00, %edx
- orl 4(%esp), %edx
- movl %edx, (%esp)
- fldcw (%esp)
- frndint
- fldenv 4(%esp)
- addl $32, %esp
- cfi_adjust_cfa_offset (-32)
- ret
-END(__trunc)
+double
+__trunc (double x)
+{
+ fenv_t fenv;
+ double r;
+
+ libc_feholdexcept_setround_387 (&fenv, FE_TOWARDZERO);
+ asm volatile ("frndint" : "=t" (r) : "0" (x));
+ /* Preserve "invalid" exceptions from sNaN input. */
+ fenv.__status_word |= libc_fetestexcept_387 (FE_INVALID);
+ libc_fesetenv_387 (&fenv);
+
+ return r;
+}
libm_alias_double (__trunc, trunc)
diff --git a/sysdeps/i386/fpu/s_truncf.S b/sysdeps/i386/fpu/s_truncf.c
similarity index 61%
rename from sysdeps/i386/fpu/s_truncf.S
rename to sysdeps/i386/fpu/s_truncf.c
index 7bdf0e5111..86d46ff660 100644
--- a/sysdeps/i386/fpu/s_truncf.S
+++ b/sysdeps/i386/fpu/s_truncf.c
@@ -1,5 +1,5 @@
-/* Truncate float value.
- Copyright (C) 1997-2023 Free Software Foundation, Inc.
+/* Round to integer, toward zero. i386 version.
+ Copyright (C) 2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -16,22 +16,23 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#include <machine/asm.h>
+#define NO_MATH_REDIRECT
+#include <math.h>
+#include <fenv_private.h>
#include <libm-alias-float.h>
-ENTRY(__truncf)
- flds 4(%esp)
- subl $32, %esp
- cfi_adjust_cfa_offset (32)
- fnstenv 4(%esp)
- movl $0xc00, %edx
- orl 4(%esp), %edx
- movl %edx, (%esp)
- fldcw (%esp)
- frndint
- fldenv 4(%esp)
- addl $32, %esp
- cfi_adjust_cfa_offset (-32)
- ret
-END(__truncf)
+float
+__truncf (float x)
+{
+ fenv_t fenv;
+ float r;
+
+ libc_feholdexcept_setround_387 (&fenv, FE_TOWARDZERO);
+ asm volatile ("frndint" : "=t" (r) : "0" (x));
+ /* Preserve "invalid" exceptions from sNaN input. */
+ fenv.__status_word |= libc_fetestexcept_387 (FE_INVALID);
+ libc_fesetenv_387 (&fenv);
+
+ return r;
+}
libm_alias_float (__trunc, trunc)
--
2.34.1
next prev parent reply other threads:[~2023-12-28 17:20 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-28 17:20 [PATCH 00/12] Improve rounding to interger function for C23 Adhemerval Zanella
2023-12-28 17:20 ` [PATCH 01/12] math: Reformat Makefile Adhemerval Zanella
2024-04-01 13:57 ` H.J. Lu
2023-12-28 17:20 ` [PATCH 02/12] powerpc: Add missing arch flags on rounding ifunc variants Adhemerval Zanella
2024-04-01 13:59 ` H.J. Lu
2024-04-01 16:50 ` Peter Bergner
2023-12-28 17:20 ` [PATCH 03/12] math: Add test to check if ceil raise inexact floating-point exception Adhemerval Zanella
2024-04-01 14:01 ` H.J. Lu
2023-12-28 17:20 ` [PATCH 04/12] math: Add test to check if floor " Adhemerval Zanella
2024-04-01 14:02 ` H.J. Lu
2023-12-28 17:20 ` [PATCH 05/12] math: Add test to check if trunc " Adhemerval Zanella
2024-04-01 14:03 ` H.J. Lu
2023-12-28 17:20 ` [PATCH 06/12] math: Add test to check if round " Adhemerval Zanella
2024-04-01 14:02 ` H.J. Lu
2023-12-28 17:20 ` [PATCH 07/12] x86: Do not raise inexact exception on ceill Adhemerval Zanella
2024-04-01 14:12 ` H.J. Lu
2023-12-28 17:20 ` [PATCH 08/12] x86: Do not raise inexact exception on floorl Adhemerval Zanella
2024-04-01 14:13 ` H.J. Lu
2023-12-28 17:20 ` [PATCH 09/12] x86: Do not raise inexact exception on truncl Adhemerval Zanella
2024-04-01 14:14 ` H.J. Lu
2023-12-28 17:20 ` [PATCH 10/12] x86: Do not raise inexact exception on floor/floorf Adhemerval Zanella
2024-04-01 14:15 ` H.J. Lu
2023-12-28 17:20 ` [PATCH 11/12] i386: Do not raise inexact exception on ceil/ceilf Adhemerval Zanella
2024-04-01 14:16 ` H.J. Lu
2023-12-28 17:20 ` Adhemerval Zanella [this message]
2024-04-01 14:17 ` [PATCH 12/12] i386: Do not raise inexact exception on trunc/truncf H.J. Lu
2024-02-16 17:47 ` [PATCH 00/12] Improve rounding to interger function for C23 Adhemerval Zanella Netto
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