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[Qemu-devel] [PATCH v2 4/6] softfloat: Correctly handle NaNs in float16_
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PATCH v2 4/6] softfloat: Correctly handle NaNs in float16_to_float32() |
Date: |
Wed, 9 Feb 2011 16:27:28 +0000 |
Correctly handle NaNs in float16_to_float32(), by defining and
using a float16ToCommonNaN() function, as we do with the other formats.
Signed-off-by: Peter Maydell <address@hidden>
---
fpu/softfloat-specialize.h | 17 +++++++++++++++++
fpu/softfloat.c | 4 +---
2 files changed, 18 insertions(+), 3 deletions(-)
diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.h
index 4907484..af82359 100644
--- a/fpu/softfloat-specialize.h
+++ b/fpu/softfloat-specialize.h
@@ -116,6 +116,23 @@ float16 float16_maybe_silence_nan(float16 a)
}
/*----------------------------------------------------------------------------
+| Returns the result of converting the half-precision floating-point NaN
+| `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid
+| exception is raised.
+*----------------------------------------------------------------------------*/
+
+static commonNaNT float16ToCommonNaN( float16 a STATUS_PARAM )
+{
+ commonNaNT z;
+
+ if ( float16_is_signaling_nan( a ) ) float_raise( float_flag_invalid
STATUS_VAR );
+ z.sign = a >> 15;
+ z.low = 0;
+ z.high = ((bits64) a)<<54;
+ return z;
+}
+
+/*----------------------------------------------------------------------------
| Returns the result of converting the canonical NaN `a' to the half-
| precision floating-point format.
*----------------------------------------------------------------------------*/
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 4d51428..735db38 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -2733,9 +2733,7 @@ float32 float16_to_float32(float16 a, flag ieee
STATUS_PARAM)
if (aExp == 0x1f && ieee) {
if (aSig) {
- /* Make sure correct exceptions are raised. */
- float32ToCommonNaN(a STATUS_VAR);
- aSig |= 0x200;
+ return commonNaNToFloat32(float16ToCommonNaN(a STATUS_VAR)
STATUS_VAR);
}
return packFloat32(aSign, 0xff, aSig << 13);
}
--
1.7.1
- [Qemu-devel] [PATCH v2 0/6] target-arm: Fix floating point conversions, Peter Maydell, 2011/02/09
- [Qemu-devel] [PATCH v2 2/6] softfloat: Honour default_nan_mode for float-to-float conversions, Peter Maydell, 2011/02/09
- [Qemu-devel] [PATCH v2 4/6] softfloat: Correctly handle NaNs in float16_to_float32(),
Peter Maydell <=
- [Qemu-devel] [PATCH v2 6/6] target-arm: Use standard FPSCR for Neon half-precision operations, Peter Maydell, 2011/02/09
- [Qemu-devel] [PATCH v2 3/6] softfloat: Fix single-to-half precision float conversions, Peter Maydell, 2011/02/09
- [Qemu-devel] [PATCH v2 1/6] softfloat: Add float16 type and float16 NaN handling functions, Peter Maydell, 2011/02/09
- [Qemu-devel] [PATCH v2 5/6] target-arm: Silence NaNs resulting from half-precision conversions, Peter Maydell, 2011/02/09