Remove is_sbyte64() and replace with is_sbyte32() plus custom warning

is_sbyte64() was equivalent to is_sbyte32() plus the warning; however,
the warning is only used in one place (and conflicts with another
warning there), so remove the function.

Furthermore, add back the test for pure immediates in
possible_sbyte(); they had been broken out but never folded back in --
and are essential.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 9 insertions, 28 deletions

diff --git a/assemble.c b/assemble.c
index a005c535..1ed78bbf 100644
--- a/assemble.c
+++ b/assemble.c
@@ -746,7 +746,8 @@ int64_t insn_size(int32_t segment, int64_t offset, int bits, uint32_t cp,
 
 static bool possible_sbyte(operand *o)
 {
-    return !(o->opflags & OPFLAG_FORWARD) &&
+    return o->wrt == NO_SEG && o->segment == NO_SEG &&
+	!(o->opflags & OPFLAG_FORWARD) &&
 	optimizing >= 0 && !(o->type & STRICT);
 }
 
@@ -773,30 +774,6 @@ static bool is_sbyte32(operand *o)
     return v >= -128 && v <= 127;
 }
 
-/* check that opn[op] is a signed byte of size 32; warn if this is not
-   the original value when extended to 64 bits */
-static bool is_sbyte64(operand *o, bool warn)
-{
-    int64_t v64;
-    int32_t v;
-
-    if (!(o->wrt == NO_SEG && o->segment == NO_SEG))
-	return false;		/* Not a pure immediate */
-
-    v64 = o->offset;
-    v = (int32_t)v64;
-
-    if (warn && v64 != v)
-	errfunc(ERR_WARNING | ERR_PASS2 | ERR_WARN_NOV,
-		"signed dword immediate exceeds bounds");
-
-    /* dead in the water on forward reference or External */
-    if (!possible_sbyte(o))
-	return false;
-
-    v = o->offset;
-    return v >= -128 && v <= 127;
-}
 static int64_t calcsize(int32_t segment, int64_t offset, int bits,
 			insn * ins, const uint8_t *codes)
 {
@@ -974,7 +951,7 @@ static int64_t calcsize(int32_t segment, int64_t offset, int bits,
         case 0251:
         case 0252:
         case 0253:
-            length += is_sbyte64(opx, false) ? 1 : 4;
+            length += is_sbyte32(opx) ? 1 : 4;
             break;
 	case 0260:
 	case 0261:
@@ -1598,8 +1575,12 @@ static void gencode(int32_t segment, int64_t offset, int bits,
         case 0252:
 	case 0253:
             data = opx->offset;
-	    warn_overflow(4, opx);
-            if (is_sbyte64(opx, true)) {
+	    if (opx->wrt == NO_SEG && opx->segment == NO_SEG &&
+		(int32_t)data != (int64_t)data) {
+		errfunc(ERR_WARNING | ERR_PASS2 | ERR_WARN_NOV,
+			"signed dword immediate exceeds bounds");
+	    }
+            if (is_sbyte32(opx)) {
                 bytes[0] = data;
                 out(offset, segment, bytes, OUT_RAWDATA, 1, NO_SEG,
                     NO_SEG);