Floating point to integer (inline assembly)

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Article #14265

#14265

From: Peter Kuterna
Date: Fri, 29 Jan 1999 00:00

25 lines
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We have in program in C that performs a test of the floating point
hardware.

Because of the C standard, the conversion from floating point to
integer is truncated. But we need to test this in the four available
rounding modes. For the i386-version of the program, I was able to
find some code with inline assembly that online performs the
conversion, and doesn't set the rounding mode to zero. The code is as
follows:

static inline int RoundToInt(double d) {
  int i;

  asm ("fistpl %0" : "=m" (i) : "t" (d) : "%st");

  return i;
}

But I'm not able to generate assembly code for the Sparc-version of
the program. Is there someone who can help me out with this?

We use gcc 2.8.1 on our system.

Thanks in advance,
Peter.

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From: kuterna@uia.ua.ac.be (Peter Kuterna)
Subject: Floating point to integer (inline assembly)
Date: 1999/01/29
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