[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-ppc] [RFC PATCH v1 2/2] softfloat: Add float128_to_uint32_roun
From: |
Bharata B Rao |
Subject: |
Re: [Qemu-ppc] [RFC PATCH v1 2/2] softfloat: Add float128_to_uint32_round_to_zero() |
Date: |
Wed, 8 Feb 2017 06:14:03 +0530 |
User-agent: |
Mutt/1.7.1 (2016-10-04) |
On Tue, Feb 07, 2017 at 02:10:04PM -0800, Richard Henderson wrote:
> On 02/07/2017 12:04 AM, Bharata B Rao wrote:
> > + int64_t v;
> > + uint32_t res;
> > + int old_exc_flags = get_float_exception_flags(status);
> > +
> > + v = float128_to_uint64_round_to_zero(a, status);
> > + if (v > 0xffffffff) {
>
> v should be uint64_t.
Right, here is the updated patch...
Peter/David - If you want both the patches to be posted afresh, let me know.
(These patches apply on David's ppc-for-2.9 branch)
>From 24afd78beb5f5742f9da76cf5330ea465697be7b Mon Sep 17 00:00:00 2001
From: Bharata B Rao <address@hidden>
Date: Mon, 30 Jan 2017 15:23:04 +0530
Subject: [PATCH v2 2/2] softfloat: Add float128_to_uint32_round_to_zero()
float128_to_uint32_round_to_zero() is needed by xscvqpuwz instruction
of PowerPC ISA 3.0.
Signed-off-by: Bharata B Rao <address@hidden>
Reviewed-by: Peter Maydell <address@hidden>
---
fpu/softfloat.c | 28 ++++++++++++++++++++++++++++
include/fpu/softfloat.h | 1 +
2 files changed, 29 insertions(+)
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 4a4b50b..c2f0de0 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -6169,6 +6169,34 @@ uint64_t float128_to_uint64_round_to_zero(float128 a,
float_status *status)
/*----------------------------------------------------------------------------
| Returns the result of converting the quadruple-precision floating-point
+| value `a' to the 32-bit unsigned integer format. The conversion
+| is performed according to the IEC/IEEE Standard for Binary Floating-Point
+| Arithmetic except that the conversion is always rounded toward zero.
+| If `a' is a NaN, the largest positive integer is returned. Otherwise,
+| if the conversion overflows, the largest unsigned integer is returned.
+| If 'a' is negative, the value is rounded and zero is returned; negative
+| values that do not round to zero will raise the inexact exception.
+*----------------------------------------------------------------------------*/
+
+uint32_t float128_to_uint32_round_to_zero(float128 a, float_status *status)
+{
+ uint64_t v;
+ uint32_t res;
+ int old_exc_flags = get_float_exception_flags(status);
+
+ v = float128_to_uint64_round_to_zero(a, status);
+ if (v > 0xffffffff) {
+ res = 0xffffffff;
+ } else {
+ return v;
+ }
+ set_float_exception_flags(old_exc_flags, status);
+ float_raise(float_flag_invalid, status);
+ return res;
+}
+
+/*----------------------------------------------------------------------------
+| Returns the result of converting the quadruple-precision floating-point
| value `a' to the single-precision floating-point format. The conversion
| is performed according to the IEC/IEEE Standard for Binary Floating-Point
| Arithmetic.
diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h
index 4e99253..9eb5a6b 100644
--- a/include/fpu/softfloat.h
+++ b/include/fpu/softfloat.h
@@ -714,6 +714,7 @@ int64_t float128_to_int64(float128, float_status *status);
int64_t float128_to_int64_round_to_zero(float128, float_status *status);
uint64_t float128_to_uint64(float128, float_status *status);
uint64_t float128_to_uint64_round_to_zero(float128, float_status *status);
+uint32_t float128_to_uint32_round_to_zero(float128, float_status *status);
float32 float128_to_float32(float128, float_status *status);
float64 float128_to_float64(float128, float_status *status);
floatx80 float128_to_floatx80(float128, float_status *status);
--
2.7.4