Add emulation of the PowerPC Decimal Floating Point Divide instructions
ddiv[q][.]
Signed-off-by: Tom Musta <tommu...@gmail.com>
---
target-ppc/dfp_helper.c | 36 ++++++++++++++++++++++++++++++++++++
target-ppc/helper.h | 2 ++
target-ppc/translate.c | 4 ++++
3 files changed, 42 insertions(+), 0 deletions(-)
diff --git a/target-ppc/dfp_helper.c b/target-ppc/dfp_helper.c
index 3a4e041..a9b2bbb 100644
--- a/target-ppc/dfp_helper.c
+++ b/target-ppc/dfp_helper.c
@@ -229,6 +229,13 @@ static void dfp_check_for_XX(struct PPC_DFP *dfp)
}
}
+static void dfp_check_for_ZX(struct PPC_DFP *dfp)
+{
+ if (dfp->context.status & DEC_Division_by_zero) {
+ dfp_set_FPSCR_flag(dfp, FP_ZX, FP_ZE);
+ }
+}
+
static void dfp_check_for_VXSNAN(struct PPC_DFP *dfp)
{
if (dfp->context.status & DEC_Invalid_operation) {
@@ -271,6 +278,21 @@ static void dfp_check_for_VXIMZ(struct PPC_DFP *dfp)
}
}
+static void dfp_check_for_VXZDZ(struct PPC_DFP *dfp)
+{
+ if (dfp->context.status & DEC_Division_undefined) {
+ dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXZDZ, FP_VE);
+ }
+}
+
+static void dfp_check_for_VXIDI(struct PPC_DFP *dfp)
+{
+ if (dfp->context.status & DEC_Invalid_operation) {
+ if (decNumberIsInfinite(&dfp->a) && decNumberIsInfinite(&dfp->b)) {
+ dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXIDI, FP_VE);
+ }
+ }
+}
static void dfp_run_post_processors(struct PPC_DFP *dfp,
PPC_DFP_PostProc post_processors[], const size_t n)
@@ -333,3 +355,17 @@ PPC_DFP_PostProc MUL_PPs[] = {
DFP_HELPER_TAB(dmul, decNumberMultiply, MUL_PPs, 64)
DFP_HELPER_TAB(dmulq, decNumberMultiply, MUL_PPs, 128)
+
+PPC_DFP_PostProc DIV_PPs[] = {
+ dfp_set_FPRF_from_FRT,
+ dfp_check_for_OX,
+ dfp_check_for_UX,
+ dfp_check_for_ZX,
+ dfp_check_for_XX,
+ dfp_check_for_VXSNAN,
+ dfp_check_for_VXZDZ,
+ dfp_check_for_VXIDI,
+};
+
+DFP_HELPER_TAB(ddiv, decNumberDivide, DIV_PPs, 64)
+DFP_HELPER_TAB(ddivq, decNumberDivide, DIV_PPs, 128)
diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 17c75ab..93342ea 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -624,4 +624,6 @@ DEF_HELPER_4(dsub, void, env, fprp, fprp, fprp)
DEF_HELPER_4(dsubq, void, env, fprp, fprp, fprp)
DEF_HELPER_4(dmul, void, env, fprp, fprp, fprp)
DEF_HELPER_4(dmulq, void, env, fprp, fprp, fprp)
+DEF_HELPER_4(ddiv, void, env, fprp, fprp, fprp)
+DEF_HELPER_4(ddivq, void, env, fprp, fprp, fprp)
#include "exec/def-helper.h"
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index a36ead4..1c2c49f 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -8362,6 +8362,8 @@ GEN_DFP_T_A_B_Rc(dsub)
GEN_DFP_T_A_B_Rc(dsubq)
GEN_DFP_T_A_B_Rc(dmul)
GEN_DFP_T_A_B_Rc(dmulq)
+GEN_DFP_T_A_B_Rc(ddiv)
+GEN_DFP_T_A_B_Rc(ddivq)
/*** SPE extension ***/
/* Register moves */
@@ -11295,6 +11297,8 @@ GEN_DFP_T_A_B_Rc(dsub, 0x02, 0x10),
GEN_DFP_Tp_Ap_Bp_Rc(dsubq, 0x02, 0x10),
GEN_DFP_T_A_B_Rc(dmul, 0x02, 0x01),
GEN_DFP_Tp_Ap_Bp_Rc(dmulq, 0x02, 0x01),
+GEN_DFP_T_A_B_Rc(ddiv, 0x02, 0x11),
+GEN_DFP_Tp_Ap_Bp_Rc(ddivq, 0x02, 0x11),
#undef GEN_SPE
#define GEN_SPE(name0, name1, opc2, opc3, inval0, inval1, type) \
GEN_OPCODE_DUAL(name0##_##name1, 0x04, opc2, opc3, inval0, inval1, type,
PPC_NONE)
--
1.7.1
