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+/* From Sun-Spots v6n11
+Date:    Fri, 22 Jan 88 10:07:18 EST
+From:    im4u!rutgers!rochester!srs!matt@ut-sally.UUCP
+Subject: Bug in C compiler
+
+We have had a bug in our main signal analysis tool for well over a year.
+Occasionally, and apparently w/o any regularity, one of the graphs (a
+raster display of FFTs of an input signal) would produce what looked like
+garbage, but tended to follow the basic trend of the input data.
+Recompiling the tool sometimes changed the frequency of occurance and with
+the latest changes, it tended to occur quite often.  Well, I have finally
+tracked it down to a compiler problem and this bug will bother us no
+more...
+
+Release:  Sun OS 3.2
+Systems:  Sun3, Sun2
+Comment:  The following program outputs (erroneously) 0xff00 for the
+	  second call to screwit().  Basically, the compiler fails to
+	  clear the upper half of "d7" before adding it into "a".
+	  "a" can be a signed or unsigned short.  If "a" is an int
+	  (long), it appears to work correctly.
+
+gnu@toad.com comment:  Appears to only fail this with without -O, probably
+	because the stores to d7 in main() are removed by c2.
+*/
+#include <stdio.h>
+static int fail;
+
+main()
+{
+    register short d7;
+    unsigned char b = 0;
+
+    d7 = 0x00ff;
+    screwit(&b);
+    d7 = 0xffff;
+    screwit(&b);
+    if (!fail)
+	printf("Test passed\n", d7);
+    else
+	printf("Test FAILED\n", d7);
+}
+
+screwit(b)
+register unsigned char *b;
+{
+    register unsigned char d7;
+    register unsigned short a = 0;
+
+    d7 = *b; 
+    a += (unsigned short) d7;
+    if (a == 0) return;
+    printf("C: 0x%04x\n", a);
+    fail++;
+}
+
+/*
+UUCP:	{allegra,rutgers,ames}!rochester!srs!matt	Matt Goheen
+	"First the pants, THEN the shoes."		S.R. Systems
+*/