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[avr-gcc-list] wrong code from avr-gcc 4.1.2?

From: John Regehr
Subject: [avr-gcc-list] wrong code from avr-gcc 4.1.2?
Date: Sun, 01 Jun 2008 21:14:18 -0600
User-agent: Thunderbird (X11/20080505)

In the code below, avr-gcc 4.1.2 wants to return 1 from func_1() when compiling at -Os. Specifically I'm compiling like this:

  avr-gcc -fwrapv -Os -mmcu=atmega128 foo.c

I believe the correct answer is 0 (this is what avr-gcc-4.2.2 returns at all optimization levels). I don't think the -fwrapv is relevant here but include it to be on the safe side.

John Regehr

static inline unsigned long int
div_rhs(const long int rhs)
    if (rhs == 0) return 1;
    return rhs;

unsigned long g_66;
long g_73;

int func_1 (void)
  unsigned long l_86 = -1L;
  unsigned long l_93 = -9L;
  if ((l_86 >= g_73) < (1 / div_rhs (l_93)))
    return 1;
    return 0;

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