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-rw-r--r--target-openrisc/fpu_helper.c300
1 files changed, 300 insertions, 0 deletions
diff --git a/target-openrisc/fpu_helper.c b/target-openrisc/fpu_helper.c
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+++ b/target-openrisc/fpu_helper.c
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+/*
+ * OpenRISC float helper routines
+ *
+ * Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
+ * Feng Gao <gf91597@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cpu.h"
+#include "helper.h"
+#include "exception.h"
+
+static inline uint32_t ieee_ex_to_openrisc(OpenRISCCPU *cpu, int fexcp)
+{
+ int ret = 0;
+ if (fexcp) {
+ if (fexcp & float_flag_invalid) {
+ cpu->env.fpcsr |= FPCSR_IVF;
+ ret = 1;
+ }
+ if (fexcp & float_flag_overflow) {
+ cpu->env.fpcsr |= FPCSR_OVF;
+ ret = 1;
+ }
+ if (fexcp & float_flag_underflow) {
+ cpu->env.fpcsr |= FPCSR_UNF;
+ ret = 1;
+ }
+ if (fexcp & float_flag_divbyzero) {
+ cpu->env.fpcsr |= FPCSR_DZF;
+ ret = 1;
+ }
+ if (fexcp & float_flag_inexact) {
+ cpu->env.fpcsr |= FPCSR_IXF;
+ ret = 1;
+ }
+ }
+
+ return ret;
+}
+
+static inline void update_fpcsr(OpenRISCCPU *cpu)
+{
+ int tmp = ieee_ex_to_openrisc(cpu,
+ get_float_exception_flags(&cpu->env.fp_status));
+
+ SET_FP_CAUSE(cpu->env.fpcsr, tmp);
+ if ((GET_FP_ENABLE(cpu->env.fpcsr) & tmp) &&
+ (cpu->env.fpcsr & FPCSR_FPEE)) {
+ helper_exception(&cpu->env, EXCP_FPE);
+ } else {
+ UPDATE_FP_FLAGS(cpu->env.fpcsr, tmp);
+ }
+}
+
+uint64_t HELPER(itofd)(CPUOpenRISCState *env, uint64_t val)
+{
+ uint64_t itofd;
+ OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
+
+ set_float_exception_flags(0, &cpu->env.fp_status);
+ itofd = int32_to_float64(val, &cpu->env.fp_status);
+ update_fpcsr(cpu);
+
+ return itofd;
+}
+
+uint32_t HELPER(itofs)(CPUOpenRISCState *env, uint32_t val)
+{
+ uint32_t itofs;
+ OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
+
+ set_float_exception_flags(0, &cpu->env.fp_status);
+ itofs = int32_to_float32(val, &cpu->env.fp_status);
+ update_fpcsr(cpu);
+
+ return itofs;
+}
+
+uint64_t HELPER(ftoid)(CPUOpenRISCState *env, uint64_t val)
+{
+ uint64_t ftoid;
+ OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
+
+ set_float_exception_flags(0, &cpu->env.fp_status);
+ ftoid = float32_to_int64(val, &cpu->env.fp_status);
+ update_fpcsr(cpu);
+
+ return ftoid;
+}
+
+uint32_t HELPER(ftois)(CPUOpenRISCState *env, uint32_t val)
+{
+ uint32_t ftois;
+ OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
+
+ set_float_exception_flags(0, &cpu->env.fp_status);
+ ftois = float32_to_int32(val, &cpu->env.fp_status);
+ update_fpcsr(cpu);
+
+ return ftois;
+}
+
+#define FLOAT_OP(name, p) void helper_float_##_##p(void)
+
+#define FLOAT_CALC(name) \
+uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env, \
+ uint64_t fdt0, uint64_t fdt1) \
+{ \
+ uint64_t result; \
+ OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env)); \
+ set_float_exception_flags(0, &cpu->env.fp_status); \
+ result = float64_ ## name(fdt0, fdt1, &cpu->env.fp_status); \
+ update_fpcsr(cpu); \
+ return result; \
+} \
+ \
+uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env, \
+ uint32_t fdt0, uint32_t fdt1) \
+{ \
+ uint32_t result; \
+ OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env)); \
+ set_float_exception_flags(0, &cpu->env.fp_status); \
+ result = float32_ ## name(fdt0, fdt1, &cpu->env.fp_status); \
+ update_fpcsr(cpu); \
+ return result; \
+} \
+
+FLOAT_CALC(add)
+FLOAT_CALC(sub)
+FLOAT_CALC(mul)
+FLOAT_CALC(div)
+FLOAT_CALC(rem)
+#undef FLOAT_CALC
+
+#define FLOAT_TERNOP(name1, name2) \
+uint64_t helper_float_ ## name1 ## name2 ## _d(CPUOpenRISCState *env, \
+ uint64_t fdt0, \
+ uint64_t fdt1) \
+{ \
+ uint64_t result, temp, hi, lo; \
+ uint32_t val1, val2; \
+ OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env)); \
+ hi = env->fpmaddhi; \
+ lo = env->fpmaddlo; \
+ set_float_exception_flags(0, &cpu->env.fp_status); \
+ result = float64_ ## name1(fdt0, fdt1, &cpu->env.fp_status); \
+ lo &= 0xffffffff; \
+ hi &= 0xffffffff; \
+ temp = (hi << 32) | lo; \
+ result = float64_ ## name2(result, temp, &cpu->env.fp_status); \
+ val1 = result >> 32; \
+ val2 = (uint32_t) (result & 0xffffffff); \
+ update_fpcsr(cpu); \
+ cpu->env.fpmaddlo = val2; \
+ cpu->env.fpmaddhi = val1; \
+ return 0; \
+} \
+ \
+uint32_t helper_float_ ## name1 ## name2 ## _s(CPUOpenRISCState *env, \
+ uint32_t fdt0, uint32_t fdt1) \
+{ \
+ uint64_t result, temp, hi, lo; \
+ uint32_t val1, val2; \
+ OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env)); \
+ hi = cpu->env.fpmaddhi; \
+ lo = cpu->env.fpmaddlo; \
+ set_float_exception_flags(0, &cpu->env.fp_status); \
+ result = float64_ ## name1(fdt0, fdt1, &cpu->env.fp_status); \
+ temp = (hi << 32) | lo; \
+ result = float64_ ## name2(result, temp, &cpu->env.fp_status); \
+ val1 = result >> 32; \
+ val2 = (uint32_t) (result & 0xffffffff); \
+ update_fpcsr(cpu); \
+ cpu->env.fpmaddlo = val2; \
+ cpu->env.fpmaddhi = val1; \
+ return 0; \
+}
+
+FLOAT_TERNOP(mul, add)
+#undef FLOAT_TERNOP
+
+
+#define FLOAT_CMP(name) \
+uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env, \
+ uint64_t fdt0, uint64_t fdt1) \
+{ \
+ int res; \
+ OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env)); \
+ set_float_exception_flags(0, &cpu->env.fp_status); \
+ res = float64_ ## name(fdt0, fdt1, &cpu->env.fp_status); \
+ update_fpcsr(cpu); \
+ return res; \
+} \
+ \
+uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env, \
+ uint32_t fdt0, uint32_t fdt1)\
+{ \
+ int res; \
+ OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env)); \
+ set_float_exception_flags(0, &cpu->env.fp_status); \
+ res = float32_ ## name(fdt0, fdt1, &cpu->env.fp_status); \
+ update_fpcsr(cpu); \
+ return res; \
+}
+
+FLOAT_CMP(le)
+FLOAT_CMP(eq)
+FLOAT_CMP(lt)
+#undef FLOAT_CMP
+
+
+#define FLOAT_CMPNE(name) \
+uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env, \
+ uint64_t fdt0, uint64_t fdt1) \
+{ \
+ int res; \
+ OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env)); \
+ set_float_exception_flags(0, &cpu->env.fp_status); \
+ res = !float64_eq_quiet(fdt0, fdt1, &cpu->env.fp_status); \
+ update_fpcsr(cpu); \
+ return res; \
+} \
+ \
+uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env, \
+ uint32_t fdt0, uint32_t fdt1) \
+{ \
+ int res; \
+ OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env)); \
+ set_float_exception_flags(0, &cpu->env.fp_status); \
+ res = !float32_eq_quiet(fdt0, fdt1, &cpu->env.fp_status); \
+ update_fpcsr(cpu); \
+ return res; \
+}
+
+FLOAT_CMPNE(ne)
+#undef FLOAT_CMPNE
+
+#define FLOAT_CMPGT(name) \
+uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env, \
+ uint64_t fdt0, uint64_t fdt1) \
+{ \
+ int res; \
+ OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env)); \
+ set_float_exception_flags(0, &cpu->env.fp_status); \
+ res = !float64_le(fdt0, fdt1, &cpu->env.fp_status); \
+ update_fpcsr(cpu); \
+ return res; \
+} \
+ \
+uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env, \
+ uint32_t fdt0, uint32_t fdt1) \
+{ \
+ int res; \
+ OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env)); \
+ set_float_exception_flags(0, &cpu->env.fp_status); \
+ res = !float32_le(fdt0, fdt1, &cpu->env.fp_status); \
+ update_fpcsr(cpu); \
+ return res; \
+}
+FLOAT_CMPGT(gt)
+#undef FLOAT_CMPGT
+
+#define FLOAT_CMPGE(name) \
+uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env, \
+ uint64_t fdt0, uint64_t fdt1) \
+{ \
+ int res; \
+ OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env)); \
+ set_float_exception_flags(0, &cpu->env.fp_status); \
+ res = !float64_lt(fdt0, fdt1, &cpu->env.fp_status); \
+ update_fpcsr(cpu); \
+ return res; \
+} \
+ \
+uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env, \
+ uint32_t fdt0, uint32_t fdt1) \
+{ \
+ int res; \
+ OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env)); \
+ set_float_exception_flags(0, &cpu->env.fp_status); \
+ res = !float32_lt(fdt0, fdt1, &cpu->env.fp_status); \
+ update_fpcsr(cpu); \
+ return res; \
+}
+
+FLOAT_CMPGE(ge)
+#undef FLOAT_CMPGE
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