target-ppc: Introduce DFP Extract Biased Exponent
Add emulation of the PowerPC Decimal Floating Point Extract
Biased Exponent instructions dxex[q][.].
Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/target-ppc/dfp_helper.c b/target-ppc/dfp_helper.c
index c6c104b..8c8ee79 100644
--- a/target-ppc/dfp_helper.c
+++ b/target-ppc/dfp_helper.c
@@ -1121,3 +1121,34 @@
DFP_HELPER_ENBCD(denbcd, 64)
DFP_HELPER_ENBCD(denbcdq, 128)
+
+#define DFP_HELPER_XEX(op, size) \
+void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *b) \
+{ \
+ struct PPC_DFP dfp; \
+ \
+ dfp_prepare_decimal##size(&dfp, 0, b, env); \
+ \
+ if (unlikely(decNumberIsSpecial(&dfp.b))) { \
+ if (decNumberIsInfinite(&dfp.b)) { \
+ *t = -1; \
+ } else if (decNumberIsSNaN(&dfp.b)) { \
+ *t = -3; \
+ } else if (decNumberIsQNaN(&dfp.b)) { \
+ *t = -2; \
+ } else { \
+ assert(0); \
+ } \
+ } else { \
+ if ((size) == 64) { \
+ *t = dfp.b.exponent + 398; \
+ } else if ((size) == 128) { \
+ *t = dfp.b.exponent + 6176; \
+ } else { \
+ assert(0); \
+ } \
+ } \
+}
+
+DFP_HELPER_XEX(dxex, 64)
+DFP_HELPER_XEX(dxexq, 128)
