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[Qemu-devel] [PATCH v2 2/5] target/m68k: add fmod/frem
From: |
Laurent Vivier |
Subject: |
[Qemu-devel] [PATCH v2 2/5] target/m68k: add fmod/frem |
Date: |
Thu, 23 Nov 2017 17:35:35 +0100 |
Use floatx80_mod() and floatx80_rem()
The quotient byte of the FPSR is updated with
the result of the operation.
Signed-off-by: Laurent Vivier <address@hidden>
---
target/m68k/cpu.h | 1 +
target/m68k/fpu_helper.c | 33 +++++++++++++++++++++++++++++++++
target/m68k/helper.h | 2 ++
target/m68k/translate.c | 6 ++++++
4 files changed, 42 insertions(+)
diff --git a/target/m68k/cpu.h b/target/m68k/cpu.h
index afae5f68ac..4ba613dfbe 100644
--- a/target/m68k/cpu.h
+++ b/target/m68k/cpu.h
@@ -234,6 +234,7 @@ typedef enum {
/* Quotient */
#define FPSR_QT_MASK 0x00ff0000
+#define FPSR_QT_SHIFT 16
/* Floating-Point Control Register */
/* Rounding mode */
diff --git a/target/m68k/fpu_helper.c b/target/m68k/fpu_helper.c
index 665e7609af..dd8b6950d6 100644
--- a/target/m68k/fpu_helper.c
+++ b/target/m68k/fpu_helper.c
@@ -508,3 +508,36 @@ uint32_t HELPER(fmovemd_ld_postinc)(CPUM68KState *env,
uint32_t addr,
{
return fmovem_postinc(env, addr, mask, cpu_ld_float64_ra);
}
+
+static void make_quotient(CPUM68KState *env, floatx80 val)
+{
+ int32_t quotient;
+ int sign;
+
+ if (floatx80_is_any_nan(val)) {
+ return;
+ }
+
+ quotient = floatx80_to_int32(val, &env->fp_status);
+ sign = quotient < 0;
+ if (sign) {
+ quotient = -quotient;
+ }
+
+ quotient = (sign << 7) | (quotient & 0x7f);
+ env->fpsr = (env->fpsr & ~FPSR_QT_MASK) | (quotient << FPSR_QT_SHIFT);
+}
+
+void HELPER(fmod)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
+{
+ res->d = floatx80_mod(val1->d, val0->d, &env->fp_status);
+
+ make_quotient(env, res->d);
+}
+
+void HELPER(frem)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
+{
+ res->d = floatx80_rem(val1->d, val0->d, &env->fp_status);
+
+ make_quotient(env, res->d);
+}
diff --git a/target/m68k/helper.h b/target/m68k/helper.h
index eebe52dae5..ff9d99ae27 100644
--- a/target/m68k/helper.h
+++ b/target/m68k/helper.h
@@ -61,6 +61,8 @@ DEF_HELPER_3(fmovemx_ld_postinc, i32, env, i32, i32)
DEF_HELPER_3(fmovemd_st_predec, i32, env, i32, i32)
DEF_HELPER_3(fmovemd_st_postinc, i32, env, i32, i32)
DEF_HELPER_3(fmovemd_ld_postinc, i32, env, i32, i32)
+DEF_HELPER_4(fmod, void, env, fp, fp, fp)
+DEF_HELPER_4(frem, void, env, fp, fp, fp)
DEF_HELPER_3(mac_move, void, env, i32, i32)
DEF_HELPER_3(macmulf, i64, env, i32, i32)
diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index b60909222c..66f873899f 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -4686,6 +4686,9 @@ DISAS_INSN(fpu)
case 0x64: /* fddiv */
gen_helper_fddiv(cpu_env, cpu_dest, cpu_src, cpu_dest);
break;
+ case 0x21: /* fmod */
+ gen_helper_fmod(cpu_env, cpu_dest, cpu_src, cpu_dest);
+ break;
case 0x22: /* fadd */
gen_helper_fadd(cpu_env, cpu_dest, cpu_src, cpu_dest);
break;
@@ -4707,6 +4710,9 @@ DISAS_INSN(fpu)
case 0x24: /* fsgldiv */
gen_helper_fsgldiv(cpu_env, cpu_dest, cpu_src, cpu_dest);
break;
+ case 0x25: /* frem */
+ gen_helper_frem(cpu_env, cpu_dest, cpu_src, cpu_dest);
+ break;
case 0x27: /* fsglmul */
gen_helper_fsglmul(cpu_env, cpu_dest, cpu_src, cpu_dest);
break;
--
2.13.6
- [Qemu-devel] [PATCH v2 0/5] target/m68k: implement 680x0 FPU (part 3), Laurent Vivier, 2017/11/23
- [Qemu-devel] [PATCH v2 2/5] target/m68k: add fmod/frem,
Laurent Vivier <=
- [Qemu-devel] [PATCH v2 3/5] softfloat: use floatx80_infinity in softfloat, Laurent Vivier, 2017/11/23
- [Qemu-devel] [PATCH v2 4/5] softfloat: add floatx80_getman(), floatx80_getexp(), floatx80_scale(), Laurent Vivier, 2017/11/23
- [Qemu-devel] [PATCH v2 5/5] target-m68k: add fscale, fgetman and fgetexp, Laurent Vivier, 2017/11/23
- [Qemu-devel] [PATCH v2 1/5] softfloat: add floatx80_mod(), Laurent Vivier, 2017/11/23
- Re: [Qemu-devel] [PATCH v2 0/5] target/m68k: implement 680x0 FPU (part 3), Peter Maydell, 2017/11/29