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Re: [Qemu-devel] [PATCH RFC v1 15/29] target-arc: MUL64, MULU64, DIVAW


From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH RFC v1 15/29] target-arc: MUL64, MULU64, DIVAW
Date: Tue, 20 Sep 2016 17:20:40 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

On 09/08/2016 03:31 PM, Michael Rolnik wrote:
Signed-off-by: Michael Rolnik <address@hidden>
---
 target-arc/translate-inst.c | 105 ++++++++++++++++++++++++++++++++++++++++++++
 target-arc/translate-inst.h |   4 ++
 2 files changed, 109 insertions(+)

diff --git a/target-arc/translate-inst.c b/target-arc/translate-inst.c
index 92c75ac..c3795fe 100644
--- a/target-arc/translate-inst.c
+++ b/target-arc/translate-inst.c
@@ -1546,3 +1546,108 @@ int arc_gen_MPYU(DisasCtxt *ctx, TCGv dest, TCGv src1, 
TCGv src2)
     return BS_NONE;
 }

+/*
+    DIVAW
+*/
+int arc_gen_DIVAW(DisasCtxt *ctx, TCGv dest, TCGv src1, TCGv src2)
+{
+    TCGLabel *label_else = gen_new_label();
+    TCGLabel *label_done = gen_new_label();
+    TCGv rslt = dest;
+    TCGv temp = dest;
+
+    if (TCGV_EQUAL(dest, src1) || TCGV_EQUAL(dest, src2)) {
+        rslt = tcg_temp_new_i32();
+    }
+
+    /*
+        if (src1 == 0)
+            dest = 0
+        else
+        {
+            src1_temp = src1 << 1
+            if (src1_temp >= src2)
+                dest = ((src1_temp - src2) | 0x0000_0001)
+            else
+                dest = src1_temp
+        }
+    */

Probably better with two movcond instead of branches.


r~



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