[Qemu-devel] [PATCH 3/7] target/m68k: add fsglmul and fsgldiv

[Laurent Vivier]

fsglmul and fsgldiv truncate data to single precision before computing
results.

Signed-off-by: Laurent Vivier <address@hidden>
---
 target/m68k/fpu_helper.c | 22 ++++++++++++++++++++++
 target/m68k/helper.h     |  2 ++
 target/m68k/translate.c  |  6 ++++++
 3 files changed, 30 insertions(+)

diff --git a/target/m68k/fpu_helper.c b/target/m68k/fpu_helper.c
index 912c0b7..0d83925 100644
--- a/target/m68k/fpu_helper.c
+++ b/target/m68k/fpu_helper.c
@@ -183,11 +183,33 @@ void HELPER(fmul)(CPUM68KState *env, FPReg *res, FPReg 
*val0, FPReg *val1)
     res->d = floatx80_mul(val0->d, val1->d, &env->fp_status);
 }
 
+void HELPER(fsglmul)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
+{
+    float32 a, b, c;
+
+    a = floatx80_to_float32(val0->d, &env->fp_status);
+    b = floatx80_to_float32(val1->d, &env->fp_status);
+    c = float32_mul(a, b, &env->fp_status);
+
+    res->d = float32_to_floatx80(c, &env->fp_status);
+}
+
 void HELPER(fdiv)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
 {
     res->d = floatx80_div(val1->d, val0->d, &env->fp_status);
 }
 
+void HELPER(fsgldiv)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
+{
+    float32 a, b, c;
+
+    a = floatx80_to_float32(val1->d, &env->fp_status);
+    b = floatx80_to_float32(val0->d, &env->fp_status);
+    c = float32_div(a, b, &env->fp_status);
+
+    res->d = float32_to_floatx80(c, &env->fp_status);
+}
+
 static int float_comp_to_cc(int float_compare)
 {
     switch (float_compare) {
diff --git a/target/m68k/helper.h b/target/m68k/helper.h
index d6e80e4..5a006de 100644
--- a/target/m68k/helper.h
+++ b/target/m68k/helper.h
@@ -31,7 +31,9 @@ DEF_HELPER_3(fchs, void, env, fp, fp)
 DEF_HELPER_4(fadd, void, env, fp, fp, fp)
 DEF_HELPER_4(fsub, void, env, fp, fp, fp)
 DEF_HELPER_4(fmul, void, env, fp, fp, fp)
+DEF_HELPER_4(fsglmul, void, env, fp, fp, fp)
 DEF_HELPER_4(fdiv, void, env, fp, fp, fp)
+DEF_HELPER_4(fsgldiv, void, env, fp, fp, fp)
 DEF_HELPER_FLAGS_3(fcmp, TCG_CALL_NO_RWG, void, env, fp, fp)
 DEF_HELPER_FLAGS_2(set_fpcr, TCG_CALL_NO_RWG, void, env, i32)
 DEF_HELPER_FLAGS_2(ftst, TCG_CALL_NO_RWG, void, env, fp)
diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index a54da87..a50bf5f 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -4622,6 +4622,12 @@ DISAS_INSN(fpu)
     case 0x23: case 0x63: case 0x67: /* fmul */
         gen_helper_fmul(cpu_env, cpu_dest, cpu_src, cpu_dest);
         break;
+    case 0x24: /* fsgldiv */
+        gen_helper_fsgldiv(cpu_env, cpu_dest, cpu_src, cpu_dest);
+        break;
+    case 0x27: /* fsglmul */
+        gen_helper_fsglmul(cpu_env, cpu_dest, cpu_src, cpu_dest);
+        break;
     case 0x28: case 0x68: case 0x6c: /* fsub */
         gen_helper_fsub(cpu_env, cpu_dest, cpu_src, cpu_dest);
         break;
-- 
2.9.4