[Qemu-devel] [PATCH 19/37] target-ppc: Introduce DFP Multiply

[Tom Musta]

Add emulation of the PowerPC Decimal Floating Point Multiply instructions
dmul[q][.]

Signed-off-by: Tom Musta <address@hidden>
---
 target-ppc/dfp_helper.c |   22 ++++++++++++++++++++++
 target-ppc/helper.h     |    2 ++
 target-ppc/translate.c  |    4 ++++
 3 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/target-ppc/dfp_helper.c b/target-ppc/dfp_helper.c
index 7fd7724..3a4e041 100644
--- a/target-ppc/dfp_helper.c
+++ b/target-ppc/dfp_helper.c
@@ -261,6 +261,16 @@ static void dfp_check_for_VXISI_subtract(struct PPC_DFP 
*dfp)
     dfp_check_for_VXISI(dfp, 1);
 }
 
+static void dfp_check_for_VXIMZ(struct PPC_DFP *dfp)
+{
+    if (dfp->context.status & DEC_Invalid_operation) {
+        if ((decNumberIsInfinite(&dfp->a) && decNumberIsZero(&dfp->b)) ||
+            (decNumberIsInfinite(&dfp->b) && decNumberIsZero(&dfp->a))) {
+            dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXIMZ, FP_VE);
+        }
+    }
+}
+
 
 static void dfp_run_post_processors(struct PPC_DFP *dfp,
                 PPC_DFP_PostProc post_processors[], const size_t n)
@@ -311,3 +321,15 @@ PPC_DFP_PostProc SUB_PPs[] = {
 
 DFP_HELPER_TAB(dsub, decNumberSubtract, SUB_PPs, 64)
 DFP_HELPER_TAB(dsubq, decNumberSubtract, SUB_PPs, 128)
+
+PPC_DFP_PostProc MUL_PPs[] = {
+    dfp_set_FPRF_from_FRT,
+    dfp_check_for_OX,
+    dfp_check_for_UX,
+    dfp_check_for_XX,
+    dfp_check_for_VXSNAN,
+    dfp_check_for_VXIMZ,
+};
+
+DFP_HELPER_TAB(dmul, decNumberMultiply, MUL_PPs, 64)
+DFP_HELPER_TAB(dmulq, decNumberMultiply, MUL_PPs, 128)
diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 7ae8d03..17c75ab 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -622,4 +622,6 @@ DEF_HELPER_4(dadd, void, env, fprp, fprp, fprp)
 DEF_HELPER_4(daddq, void, env, fprp, fprp, fprp)
 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)
 #include "exec/def-helper.h"
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 80dc53c..a36ead4 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -8360,6 +8360,8 @@ GEN_DFP_T_A_B_Rc(dadd)
 GEN_DFP_T_A_B_Rc(daddq)
 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)
 /***                           SPE extension                               ***/
 /* Register moves */
 
@@ -11291,6 +11293,8 @@ GEN_DFP_T_A_B_Rc(dadd, 0x02, 0x00),
 GEN_DFP_Tp_Ap_Bp_Rc(daddq, 0x02, 0x00),
 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),
 #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