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[Qemu-devel] [V5 PATCH 03/22] softfloat: Fix float64_to_uint64_round_to_
From: |
Tom Musta |
Subject: |
[Qemu-devel] [V5 PATCH 03/22] softfloat: Fix float64_to_uint64_round_to_zero |
Date: |
Thu, 2 Jan 2014 16:21:16 -0600 |
The float64_to_uint64_round_to_zero routine is incorrect.
For example, the following test pattern:
46697351FF4AEC29 / 0x1.97351ff4aec29p+103
currently produces 8000000000000000 instead of FFFFFFFFFFFFFFFF.
This patch re-implements the routine to temporarily force the
rounding mode and use the float64_to_uint64 routine.
This contribution can be licensed under either the softfloat-2a or -2b
license.
Signed-off-by: Tom Musta <address@hidden>
---
fpu/softfloat.c | 12 +++++-------
1 files changed, 5 insertions(+), 7 deletions(-)
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 9f42a5b..67ee37b 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -6681,13 +6681,11 @@ uint64_t float64_to_uint64(float64 a STATUS_PARAM)
uint64_t float64_to_uint64_round_to_zero (float64 a STATUS_PARAM)
{
- int64_t v;
-
- v = float64_val(int64_to_float64(INT64_MIN STATUS_VAR));
- v += float64_val(a);
- v = float64_to_int64_round_to_zero(make_float64(v) STATUS_VAR);
-
- return v - INT64_MIN;
+ signed char current_rounding_mode = STATUS(float_rounding_mode);
+ set_float_rounding_mode(float_round_to_zero STATUS_VAR);
+ int64_t v = float64_to_uint64(a STATUS_VAR);
+ set_float_rounding_mode(current_rounding_mode STATUS_VAR);
+ return v;
}
#define COMPARE(s, nan_exp) \
--
1.7.1
- [Qemu-devel] [V5 PATCH 00/22] target-ppc: PowerPC VSX Stage 3, Tom Musta, 2014/01/02
- [Qemu-devel] [V5 PATCH 01/22] softfloat: Fix float64_to_uint64, Tom Musta, 2014/01/02
- [Qemu-devel] [V5 PATCH 04/22] softfloat: Fix float64_to_uint32, Tom Musta, 2014/01/02
- [Qemu-devel] [V5 PATCH 02/22] softfloat: Add float32_to_uint64(), Tom Musta, 2014/01/02
- [Qemu-devel] [V5 PATCH 03/22] softfloat: Fix float64_to_uint64_round_to_zero,
Tom Musta <=
- [Qemu-devel] [V5 PATCH 05/22] softfloat: Fix float64_to_uint32_round_to_zero, Tom Musta, 2014/01/02
- [Qemu-devel] [V5 PATCH 06/22] target-ppc: Add set_fprf Argument to fload_invalid_op_excp(), Tom Musta, 2014/01/02
- [Qemu-devel] [V5 PATCH 08/22] target-ppc: Add VSX ISA2.06 xadd/xsub Instructions, Tom Musta, 2014/01/02
- [Qemu-devel] [V5 PATCH 07/22] target-ppc: General Support for VSX Helpers, Tom Musta, 2014/01/02
- [Qemu-devel] [V5 PATCH 09/22] target-ppc: Add VSX ISA2.06 xmul Instructions, Tom Musta, 2014/01/02
- [Qemu-devel] [V5 PATCH 10/22] target-ppc: Add VSX ISA2.06 xdiv Instructions, Tom Musta, 2014/01/02
- [Qemu-devel] [V5 PATCH 11/22] target-ppc: Add VSX ISA2.06 xre Instructions, Tom Musta, 2014/01/02
- [Qemu-devel] [V5 PATCH 12/22] target-ppc: Add VSX ISA2.06 xsqrt Instructions, Tom Musta, 2014/01/02
- [Qemu-devel] [V5 PATCH 13/22] target-ppc: Add VSX ISA2.06 xrsqrte Instructions, Tom Musta, 2014/01/02
- [Qemu-devel] [V5 PATCH 14/22] target-ppc: Add VSX ISA2.06 xtdiv Instructions, Tom Musta, 2014/01/02