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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
-*/