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[Qemu-devel] [PULL 23/43] softfloat: Add float128_to_uint64_round_to_zer
From: |
David Gibson |
Subject: |
[Qemu-devel] [PULL 23/43] softfloat: Add float128_to_uint64_round_to_zero() |
Date: |
Wed, 22 Feb 2017 17:33:28 +1100 |
From: Bharata B Rao <address@hidden>
Implement float128_to_uint64() and use that to implement
float128_to_uint64_round_to_zero()
This is required by xscvqpudz instruction of PowerPC ISA 3.0.
Signed-off-by: Bharata B Rao <address@hidden>
Reviewed-by: Peter Maydell <address@hidden>
Signed-off-by: David Gibson <address@hidden>
---
fpu/softfloat.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++
include/fpu/softfloat.h | 2 ++
2 files changed, 61 insertions(+)
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 5ccba76..47e4646 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -6128,6 +6128,65 @@ int64_t float128_to_int64_round_to_zero(float128 a,
float_status *status)
}
/*----------------------------------------------------------------------------
+| Returns the result of converting the quadruple-precision floating-point value
+| `a' to the 64-bit unsigned integer format. The conversion is
+| performed according to the IEC/IEEE Standard for Binary Floating-Point
+| Arithmetic---which means in particular that the conversion is rounded
+| according to the current rounding mode. If `a' is a NaN, the largest
+| positive integer is returned. 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.
+*----------------------------------------------------------------------------*/
+
+uint64_t float128_to_uint64(float128 a, float_status *status)
+{
+ flag aSign;
+ int aExp;
+ int shiftCount;
+ uint64_t aSig0, aSig1;
+
+ aSig0 = extractFloat128Frac0(a);
+ aSig1 = extractFloat128Frac1(a);
+ aExp = extractFloat128Exp(a);
+ aSign = extractFloat128Sign(a);
+ if (aSign && (aExp > 0x3FFE)) {
+ float_raise(float_flag_invalid, status);
+ if (float128_is_any_nan(a)) {
+ return LIT64(0xFFFFFFFFFFFFFFFF);
+ } else {
+ return 0;
+ }
+ }
+ if (aExp) {
+ aSig0 |= LIT64(0x0001000000000000);
+ }
+ shiftCount = 0x402F - aExp;
+ if (shiftCount <= 0) {
+ if (0x403E < aExp) {
+ float_raise(float_flag_invalid, status);
+ return LIT64(0xFFFFFFFFFFFFFFFF);
+ }
+ shortShift128Left(aSig0, aSig1, -shiftCount, &aSig0, &aSig1);
+ } else {
+ shift64ExtraRightJamming(aSig0, aSig1, shiftCount, &aSig0, &aSig1);
+ }
+ return roundAndPackUint64(aSign, aSig0, aSig1, status);
+}
+
+uint64_t float128_to_uint64_round_to_zero(float128 a, float_status *status)
+{
+ uint64_t v;
+ signed char current_rounding_mode = status->float_rounding_mode;
+
+ set_float_rounding_mode(float_round_to_zero, status);
+ v = float128_to_uint64(a, status);
+ set_float_rounding_mode(current_rounding_mode, status);
+
+ return v;
+}
+
+/*----------------------------------------------------------------------------
| 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
diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h
index 8a39028..a09ad0e 100644
--- a/include/fpu/softfloat.h
+++ b/include/fpu/softfloat.h
@@ -714,6 +714,8 @@ int32_t float128_to_int32(float128, float_status *status);
int32_t float128_to_int32_round_to_zero(float128, float_status *status);
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);
float32 float128_to_float32(float128, float_status *status);
float64 float128_to_float64(float128, float_status *status);
floatx80 float128_to_floatx80(float128, float_status *status);
--
2.9.3
- [Qemu-devel] [PULL 07/43] ppc: implement xssubqp instruction, (continued)
- [Qemu-devel] [PULL 07/43] ppc: implement xssubqp instruction, David Gibson, 2017/02/22
- [Qemu-devel] [PULL 06/43] ppc: implement xssqrtqp instruction, David Gibson, 2017/02/22
- [Qemu-devel] [PULL 11/43] spapr: fix off-by-one error in spapr_ovec_populate_dt(), David Gibson, 2017/02/22
- [Qemu-devel] [PULL 33/43] pc: move pcms->possible_cpus init out of pc_cpus_init(), David Gibson, 2017/02/22
- [Qemu-devel] [PULL 24/43] softfloat: Add float128_to_uint32_round_to_zero(), David Gibson, 2017/02/22
- [Qemu-devel] [PULL 36/43] change CPUArchId.cpu type to Object*, David Gibson, 2017/02/22
- [Qemu-devel] [PULL 13/43] target-ppc: implement store atomic instruction, David Gibson, 2017/02/22
- [Qemu-devel] [PULL 26/43] target-ppc: Add xscvqpudz and xscvqpuwz instructions, David Gibson, 2017/02/22
- [Qemu-devel] [PULL 15/43] target-ppc: add slbieg instruction, David Gibson, 2017/02/22
- [Qemu-devel] [PULL 28/43] target/ppc/POWER9: Add ISAv3.00 MMU definition, David Gibson, 2017/02/22
- [Qemu-devel] [PULL 23/43] softfloat: Add float128_to_uint64_round_to_zero(),
David Gibson <=
- [Qemu-devel] [PULL 22/43] softfloat: Add round-to-odd rounding mode, David Gibson, 2017/02/22
- [Qemu-devel] [PULL 20/43] ppc4xx: replace debug printf with trace points, David Gibson, 2017/02/22
- [Qemu-devel] [PULL 19/43] mac99: replace debug printf with trace points, David Gibson, 2017/02/22
- [Qemu-devel] [PULL 10/43] target-ppc: Add xsmaxjdp and xsminjdp instructions, David Gibson, 2017/02/22
- [Qemu-devel] [PULL 25/43] target-ppc: Implement round to odd variants of quad FP instructions, David Gibson, 2017/02/22
- [Qemu-devel] [PULL 35/43] pc: pass apic_id to pc_find_cpu_slot() directly so lookup could be done without CPU object, David Gibson, 2017/02/22
- [Qemu-devel] [PULL 21/43] spapr: replace debug printf with trace points, David Gibson, 2017/02/22
- [Qemu-devel] [PULL 32/43] machine: move possible_cpus to MachineState, David Gibson, 2017/02/22
- [Qemu-devel] [PULL 34/43] pc: calculate topology only once when possible_cpus is initialised, David Gibson, 2017/02/22
- [Qemu-devel] [PULL 39/43] machine: replace query_hotpluggable_cpus() callback with has_hotpluggable_cpus flag, David Gibson, 2017/02/22