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[Qemu-ppc] [PATCH 10/18] softfloat: Fix float64_to_uint64_round_to_zero
From: |
Tom Musta |
Subject: |
[Qemu-ppc] [PATCH 10/18] softfloat: Fix float64_to_uint64_round_to_zero |
Date: |
Mon, 9 Dec 2013 09:47:07 -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.
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 3d7a8ff..1003e59 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -6675,13 +6675,11 @@ 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-ppc] [PATCH 06/18] target-ppc: Add ISA2.06 lbarx, lharx Instructions, (continued)
[Qemu-ppc] [PATCH 08/18] target-ppc: Add ISA2.06 Float to Integer Instructions, Tom Musta, 2013/12/09
[Qemu-ppc] [PATCH 10/18] softfloat: Fix float64_to_uint64_round_to_zero,
Tom Musta <=
[Qemu-ppc] [PATCH 11/18] softfloat: Fix float64_to_uint32, Tom Musta, 2013/12/09
[Qemu-ppc] [PATCH 12/18] softfloat: Fix float64_to_uint32_round_to_zero, Tom Musta, 2013/12/09
[Qemu-ppc] [PATCH 13/18] target-ppc: Add ISA 2.06 fcfid[u][s] Instructions, Tom Musta, 2013/12/09
[Qemu-ppc] [PATCH 14/18] target-ppc: Fix and enable fri[mnpz], Tom Musta, 2013/12/09
[Qemu-ppc] [PATCH 15/18] target-ppc: Add ISA 2.06 ftdiv Instruction, Tom Musta, 2013/12/09
[Qemu-ppc] [PATCH 16/18] target-ppc: Add ISA 2.06 ftsqrt, Tom Musta, 2013/12/09
[Qemu-ppc] [PATCH 17/18] target-ppc: Enable frsqrtes on Power7 and Power8, Tom Musta, 2013/12/09
[Qemu-ppc] [PATCH 18/18] target-ppc: Add ISA2.06 lfiwzx Instruction, Tom Musta, 2013/12/09