[Xen-changelog] [qemu-xen master] target-ppc: Implement bcdcfz. instruction

[patchbot@xxxxxxx]

commit 38f4cb043b04e43f48317750aaa619d97e1eff37
Author:     Jose Ricardo Ziviani <joserz@xxxxxxxxxxxxxxxxxx>
AuthorDate: Tue Nov 8 14:50:24 2016 -0200
Commit:     David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
CommitDate: Tue Nov 15 10:06:48 2016 +1100

    target-ppc: Implement bcdcfz. instruction
    
    bcdcfz. converts from Zoned numeric format to BCD. Zoned format uses
    a byte to represent a digit where the most significant nibble is 0x3
    or 0xf, depending on the preferred signal.
    
    Signed-off-by: Jose Ricardo Ziviani <joserz@xxxxxxxxxxxxxxxxxx>
    Signed-off-by: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
---
 target-ppc/helper.h                 |  1 +
 target-ppc/int_helper.c             | 44 +++++++++++++++++++++++++++++++++++++
 target-ppc/translate/vmx-impl.inc.c |  7 ++++++
 3 files changed, 52 insertions(+)

diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 180c5d0..b083c08 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -380,6 +380,7 @@ DEF_HELPER_4(bcdadd, i32, avr, avr, avr, i32)
 DEF_HELPER_4(bcdsub, i32, avr, avr, avr, i32)
 DEF_HELPER_3(bcdcfn, i32, avr, avr, i32)
 DEF_HELPER_3(bcdctn, i32, avr, avr, i32)
+DEF_HELPER_3(bcdcfz, i32, avr, avr, i32)
 
 DEF_HELPER_2(xsadddp, void, env, i32)
 DEF_HELPER_2(xssubdp, void, env, i32)
diff --git a/target-ppc/int_helper.c b/target-ppc/int_helper.c
index d4106a9..2aacc94 100644
--- a/target-ppc/int_helper.c
+++ b/target-ppc/int_helper.c
@@ -2787,6 +2787,50 @@ uint32_t helper_bcdctn(ppc_avr_t *r, ppc_avr_t *b, 
uint32_t ps)
     return cr;
 }
 
+uint32_t helper_bcdcfz(ppc_avr_t *r, ppc_avr_t *b, uint32_t ps)
+{
+    int i;
+    int cr = 0;
+    int invalid = 0;
+    int zone_digit = 0;
+    int zone_lead = ps ? 0xF : 0x3;
+    int digit = 0;
+    ppc_avr_t ret = { .u64 = { 0, 0 } };
+    int sgnb = b->u8[BCD_DIG_BYTE(0)] >> 4;
+
+    if (unlikely((sgnb < 0xA) && ps)) {
+        invalid = 1;
+    }
+
+    for (i = 0; i < 16; i++) {
+        zone_digit = (i * 2) ? b->u8[BCD_DIG_BYTE(i * 2)] >> 4 : zone_lead;
+        digit = b->u8[BCD_DIG_BYTE(i * 2)] & 0xF;
+        if (unlikely(zone_digit != zone_lead || digit > 0x9)) {
+            invalid = 1;
+            break;
+        }
+
+        bcd_put_digit(&ret, digit, i + 1);
+    }
+
+    if ((ps && (sgnb == 0xB || sgnb == 0xD)) ||
+            (!ps && (sgnb & 0x4))) {
+        bcd_put_digit(&ret, BCD_NEG_PREF, 0);
+    } else {
+        bcd_put_digit(&ret, BCD_PLUS_PREF_1, 0);
+    }
+
+    cr = bcd_cmp_zero(&ret);
+
+    if (unlikely(invalid)) {
+        cr = 1 << CRF_SO;
+    }
+
+    *r = ret;
+
+    return cr;
+}
+
 void helper_vsbox(ppc_avr_t *r, ppc_avr_t *a)
 {
     int i;
diff --git a/target-ppc/translate/vmx-impl.inc.c 
b/target-ppc/translate/vmx-impl.inc.c
index 795e55c..d9e3eb6 100644
--- a/target-ppc/translate/vmx-impl.inc.c
+++ b/target-ppc/translate/vmx-impl.inc.c
@@ -987,6 +987,7 @@ GEN_BCD(bcdadd)
 GEN_BCD(bcdsub)
 GEN_BCD2(bcdcfn)
 GEN_BCD2(bcdctn)
+GEN_BCD2(bcdcfz)
 
 static void gen_xpnd04_1(DisasContext *ctx)
 {
@@ -994,6 +995,9 @@ static void gen_xpnd04_1(DisasContext *ctx)
     case 5:
         gen_bcdctn(ctx);
         break;
+    case 6:
+        gen_bcdcfz(ctx);
+        break;
     case 7:
         gen_bcdcfn(ctx);
         break;
@@ -1006,6 +1010,9 @@ static void gen_xpnd04_1(DisasContext *ctx)
 static void gen_xpnd04_2(DisasContext *ctx)
 {
     switch (opc4(ctx->opcode)) {
+    case 6:
+        gen_bcdcfz(ctx);
+        break;
     case 7:
         gen_bcdcfn(ctx);
         break;
--
generated by git-patchbot for /home/xen/git/qemu-xen.git#master

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