Make sign extension much less horrible.

mach/i80/ncg/table

@@ -1000,48 +1000,57 @@ pat loc loc cii $1==$2
 
 pat loc loc cii $1==2 && $2==4
    with hl_or_de
-uses hl_or_de={const2,0}, areg
-gen mov a,%1.1
-    ora a
-    jp {label,1f}
-    lxi %a,{const2,0-1}
-    1:					yields %a %1
+      uses hl_or_de, areg
+      gen
+         mov a, %1.1
+         ral.
+         sbb a
+         mov %a.1, a
+         mov %a.2, a
+      yields %a %1
 
 pat loc loc cii $1==4 && $2==2
-with hl_or_de hl_or_de			yields %1
+   with hl_or_de hl_or_de
+      yields %1
 
 pat loc loc cii $1==1 && $2==2
    with reg
       uses reusing %1, areg=%1, hl_or_de
-gen move {const1,0},%b.1
-    move a,%b.2
-    ora a
-    jp {label,1f}
-    mvi %b.1,{const1,255}
-    1:					yields %b
+      gen
+         mov %b.2, a
+         ral.
+         sbb a
+         mov %b.1, a
+      yields %b
    with hl_or_de
       uses areg=%1.2
-gen move {const1,0},%1.1
-    ora a
-    jp {label,1f}
-    mvi %1.1,{const1,255}
-    1:					yields %1
+      gen
+         ral.
+         sbb a
+         mov %1.1, a
+      yields %1
 
 pat loc loc cii $1==1 && $2==4
-with reg
-   uses hlreg
-   gen move %1,l			yields hl
-						leaving loc $1 loc $2 cii
+   with areg
+      uses hl_or_de, hl_or_de
+      gen
+         mov %b.2, a
+         ral.
+         sbb a
+         mov %b.1, a
+         mov %a.2, a
+         mov %a.1, a
+      yields %a %b
    with hlreg
       uses dereg, areg
-   gen move {const1,0},%1.1
-       move l,a
-       ora a
-       jp {label,1f}
-       mvi h,{const1,255}
-       1:
-       mov e,h
-       mov d,h				yields de hl
+      gen
+         mov a, l
+         ral.
+         sbb a
+         mov h, a
+         mov e, a
+         mov d, a
+      yields de hl
 
 pat cii
 kills ALL

tests/plat/core/cii_e.e

@@ -0,0 +1,112 @@
+#
+    mes 2, EM_WSIZE, EM_PSIZE
+
+    exp $_m_a_i_n
+    pro $_m_a_i_n, 0
+
+oneshort
+onebyte
+    rom 1
+moneshort
+    rom 65535
+monebyte
+    rom 255
+
+    /* Positive byte->word */
+
+    loe onebyte
+    loc 1
+    loc EM_WSIZE
+    cii
+    loc 1
+	cmu EM_WSIZE
+	zeq *1
+
+    loc __LINE__
+    cal $fail
+    asp 4
+1
+
+    /* Negative byte->word */
+
+    loe monebyte
+    loc 1
+    loc EM_WSIZE
+    cii
+    loc -1
+	cmu EM_WSIZE
+	zeq *2
+
+    loc __LINE__
+    cal $fail
+    asp 4
+2
+
+#if EM_WSIZE == 2
+    /* Positive byte->dword */
+
+    loe onebyte
+    loc 1
+    loc 4
+    cii
+    loc 0
+    loc 1
+	cmu 4
+	zeq *3
+
+    loc __LINE__
+    cal $fail
+    asp 4
+3
+
+    /* Negative byte->short */
+
+    loe monebyte
+    loc 1
+    loc 4
+    cii
+    loc -1
+    loc -1
+	cmu 4
+	zeq *4
+
+    loc __LINE__
+    cal $fail
+    asp 4
+4
+    /* Positive word->dword */
+
+    loe oneshort
+    loc 2
+    loc 4
+    cii
+    loc 0
+    loc 1
+	cmu 4
+	zeq *5
+
+    loc __LINE__
+    cal $fail
+    asp 4
+5
+
+    /* Negative word->short */
+
+    loe moneshort
+    loc 2
+    loc 4
+    cii
+    loc -1
+    loc -1
+	cmu 4
+	zeq *6
+
+    loc __LINE__
+    cal $fail
+    asp 4
+6
+#endif
+
+    cal $finished
+    end
+