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[Qemu-devel] [PATCH 067/111] m68k: add fscale


From: Bryce Lanham
Subject: [Qemu-devel] [PATCH 067/111] m68k: add fscale
Date: Wed, 17 Aug 2011 15:47:12 -0500

From: Laurent Vivier <address@hidden>

Signed-off-by: Laurent Vivier <address@hidden>
---
 .gitignore              |    1 +
 target-m68k/helper.c    |   17 +++++++++++++++++
 target-m68k/helpers.h   |    1 +
 target-m68k/translate.c |    4 ++++
 tests/m68k/Makefile     |    2 +-
 tests/m68k/fscale.S     |    9 +++++++++
 6 files changed, 33 insertions(+), 1 deletions(-)
 create mode 100644 tests/m68k/fscale.S

diff --git a/.gitignore b/.gitignore
index ef339f5..fed07c5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -79,3 +79,4 @@ tests/m68k/fmovem
 tests/m68k/fmul
 tests/m68k/fsub
 tests/m68k/fgetexp
+tests/m68k/fscale
diff --git a/target-m68k/helper.c b/target-m68k/helper.c
index 2be3355..77d88e7 100644
--- a/target-m68k/helper.c
+++ b/target-m68k/helper.c
@@ -1292,6 +1292,23 @@ void HELPER(getexp_FP0)(CPUState *env)
     floatx80_to_FP0(env, res);
 }
 
+void HELPER(scale_FP0_FP1)(CPUState *env)
+{
+    int32_t scale;
+    int32_t exp;
+
+    DBG_FPU("getexp_FP0(%Lg)\n", LDOUBLE(FP0_to_floatx80(env)));
+
+    DBG_FPU("    fp0h 0x%08x fp0l 0x%016" PRIx64 "\n", env->fp0h, env->fp0l);
+
+    scale = floatx80_to_int32(FP0_to_floatx80(env), &env->fp_status);
+
+    exp = (env->fp1h & 0x7fff) + scale;
+
+    env->fp0h = (env->fp1h & 0x8000) | (exp & 0x7fff);
+    env->fp0l = env->fp1l;
+}
+
 void HELPER(add_FP0_FP1)(CPUState *env)
 {
     floatx80 res;
diff --git a/target-m68k/helpers.h b/target-m68k/helpers.h
index 0b4c0cb..f6578ee 100644
--- a/target-m68k/helpers.h
+++ b/target-m68k/helpers.h
@@ -68,6 +68,7 @@ DEF_HELPER_1(sqrt_FP0, void, env)
 DEF_HELPER_1(abs_FP0, void, env)
 DEF_HELPER_1(chs_FP0, void, env)
 DEF_HELPER_1(getexp_FP0, void, env)
+DEF_HELPER_1(scale_FP0_FP1, void, env)
 DEF_HELPER_1(add_FP0_FP1, void, env)
 DEF_HELPER_1(sub_FP0_FP1, void, env)
 DEF_HELPER_1(mul_FP0_FP1, void, env)
diff --git a/target-m68k/translate.c b/target-m68k/translate.c
index d09e325..93f9973 100644
--- a/target-m68k/translate.c
+++ b/target-m68k/translate.c
@@ -3666,6 +3666,10 @@ DISAS_INSN(fpu)
         gen_op_load_fpr_FP1(REG(ext, 7));
         gen_helper_div_FP0_FP1(cpu_env);
         break;
+    case 0x26:                       /* fscale */
+        gen_op_load_fpr_FP1(REG(ext, 7));
+        gen_helper_scale_FP0_FP1(cpu_env);
+        break;
     case 0x27:                      /* fsglmul */
         gen_op_load_fpr_FP1(REG(ext, 7));
         gen_helper_mul_FP0_FP1(cpu_env);
diff --git a/tests/m68k/Makefile b/tests/m68k/Makefile
index a7a59ac..28a998f 100644
--- a/tests/m68k/Makefile
+++ b/tests/m68k/Makefile
@@ -1,4 +1,4 @@
-TESTS=fmovecr fmove fmovem fsub fdiv fmul fabs fgetexp
+TESTS=fmovecr fmove fmovem fsub fdiv fmul fabs fgetexp fscale
 
 all: $(TESTS)
 
diff --git a/tests/m68k/fscale.S b/tests/m68k/fscale.S
new file mode 100644
index 0000000..f6a5c62
--- /dev/null
+++ b/tests/m68k/fscale.S
@@ -0,0 +1,9 @@
+       .include "trap.i"
+
+       .text
+       .globl _start
+_start:
+       fmove.l #2, %fp0
+       fmovecr.x #0x00,%fp1
+       fscale.x %fp0, %fp1
+       exit 0
-- 
1.7.2.3




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