[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH 17/26] target-hppa: Add softfloat specializations
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 17/26] target-hppa: Add softfloat specializations |
Date: |
Fri, 16 Dec 2016 11:13:56 -0800 |
Like the original MIPS, HPPA has the MSB of an SNaN set.
However, it has different rules for silencing an SNaN:
(1) msb is cleared and (2) msb-1 must be set if the fraction
is now zero, and (implementation defined) may be set always.
I haven't checked real hardware but chose the set always
alternative because it's easy and within spec.
Signed-off-by: Richard Henderson <address@hidden>
---
fpu/softfloat-specialize.h | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.h
index f5aed72..f05c865 100644
--- a/fpu/softfloat-specialize.h
+++ b/fpu/softfloat-specialize.h
@@ -116,6 +116,8 @@ float32 float32_default_nan(float_status *status)
#elif defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA) || \
defined(TARGET_XTENSA) || defined(TARGET_S390X) ||
defined(TARGET_TRICORE)
return const_float32(0x7FC00000);
+#elif defined(TARGET_HPPA)
+ return const_float32(0x7FA00000);
#else
if (status->snan_bit_is_one) {
return const_float32(0x7FBFFFFF);
@@ -139,6 +141,8 @@ float64 float64_default_nan(float_status *status)
#elif defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA) || \
defined(TARGET_S390X)
return const_float64(LIT64(0x7FF8000000000000));
+#elif defined(TARGET_HPPA)
+ return const_float64(LIT64(0x7FF4000000000000));
#else
if (status->snan_bit_is_one) {
return const_float64(LIT64(0x7FF7FFFFFFFFFFFF));
@@ -361,7 +365,14 @@ float32 float32_maybe_silence_nan(float32 a_, float_status
*status)
{
if (float32_is_signaling_nan(a_, status)) {
if (status->snan_bit_is_one) {
+#ifdef TARGET_HPPA
+ uint32_t a = float32_val(a_);
+ a &= ~0x00400000;
+ a |= 0x00200000;
+ return make_float32(a);
+#else
return float32_default_nan(status);
+#endif
} else {
uint32_t a = float32_val(a_);
a |= (1 << 22);
@@ -449,7 +460,7 @@ static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag
bIsQNaN, flag bIsSNaN,
return 1;
}
}
-#elif defined(TARGET_MIPS)
+#elif defined(TARGET_MIPS) || defined(TARGET_HPPA)
static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
flag aIsLargerSignificand)
{
@@ -794,7 +805,14 @@ float64 float64_maybe_silence_nan(float64 a_, float_status
*status)
{
if (float64_is_signaling_nan(a_, status)) {
if (status->snan_bit_is_one) {
+#ifdef TARGET_HPPA
+ uint64_t a = float64_val(a_);
+ a &= ~0x0008000000000000ULL;
+ a |= 0x0004000000000000ULL;
+ return make_float64(a);
+#else
return float64_default_nan(status);
+#endif
} else {
uint64_t a = float64_val(a_);
a |= LIT64(0x0008000000000000);
--
2.9.3
- [Qemu-devel] [PATCH 14/26] linux-user: Add HPPA target_signal.h and target_cpu.h, (continued)
- [Qemu-devel] [PATCH 14/26] linux-user: Add HPPA target_signal.h and target_cpu.h, Richard Henderson, 2016/12/16
- [Qemu-devel] [PATCH 15/26] linux-user: Add HPPA signal handling, Richard Henderson, 2016/12/16
- [Qemu-devel] [PATCH 11/26] linux-user: Add HPPA target_syscall.h, Richard Henderson, 2016/12/16
- [Qemu-devel] [PATCH 12/26] linux-user: Add HPPA definitions to syscall_defs.h, Richard Henderson, 2016/12/16
- [Qemu-devel] [PATCH 13/26] linux-user: Add HPPA target_structs.h, Richard Henderson, 2016/12/16
- [Qemu-devel] [PATCH 10/26] linux-user: Add HPPA termbits.h, Richard Henderson, 2016/12/16
- [Qemu-devel] [PATCH 16/26] linux-user: Add HPPA startup and main loop, Richard Henderson, 2016/12/16
- [Qemu-devel] [PATCH 19/26] target-hppa: Add nullification framework, Richard Henderson, 2016/12/16
- [Qemu-devel] [PATCH 22/26] target-hppa: Implement linux-user gateway page, Richard Henderson, 2016/12/16
- [Qemu-devel] [PATCH 23/26] target-hppa: Implement shifts and deposits, Richard Henderson, 2016/12/16
- [Qemu-devel] [PATCH 17/26] target-hppa: Add softfloat specializations,
Richard Henderson <=
- [Qemu-devel] [PATCH 21/26] target-hppa: Implement branches, Richard Henderson, 2016/12/16
- [Qemu-devel] [PATCH 18/26] target-hppa: Add framework and enable compilation, Richard Henderson, 2016/12/16
- [Qemu-devel] [PATCH 25/26] target-hppa: Implement system and memory-management insns, Richard Henderson, 2016/12/16
- [Qemu-devel] [PATCH 20/26] target-hppa: Implement basic arithmetic, Richard Henderson, 2016/12/16
- [Qemu-devel] [PATCH 24/26] target-hppa: Implement loads and stores, Richard Henderson, 2016/12/16
- [Qemu-devel] [PATCH 01/26] Revert "Remove remainders of HPPA backend", Richard Henderson, 2016/12/16
- [Qemu-devel] [PATCH 26/26] target-hppa: Implement floating-point insns, Richard Henderson, 2016/12/16
- Re: [Qemu-devel] [PATCH 00/26] New hppa-linux-user target, Thomas Huth, 2016/12/18