Compiler Option: -fpmode

Selects faster, less accurate or slower, more precise floating-point math.

Syntax
	-fpmode < mode >

Parameters
	mode
		The floating point mode: FAST | PRECISE.

Description
	The -fpmode compiler option specifies whether speed or precision is more 
	important for floating point math. If this option is not specified, the 
	default is -fpmode PRECISE.

	-fpmode FAST will generate faster, less accurate instructions for 
	certain floating point operations.

	-fpmode PRECISE will generate standard floating point instructions that 
	operate at the default speed and accuracy of the selected floating point 
	unit.

	Currently, the only floating point operations that behave differently 
	when using -fpmode FAST are: KeyPgSinSin(), KeyPgCosCos(), reciprocal, and reciprocal 
	KeyPgSqrSquare Root, all of which must operate on KeyPgSingleSingle precision values.

	A number of changes were made to normalize handling of NaN's (Not a 
	Number) to get consistent results across toolchains and platforms, but 
	that costs extra code, so intention was that -fpmode FAST could allow 
	user to skip that extra code generation if they wanted (and they assume 
	responsibility how things work or do not work across platforms).

	Note:
		- for x86 and x86_64, default is -fpu x87 -fpmode PRECISE
		- -fpmode FAST|PRECISE controls code generation by fbc only
		- for optimizing with '-gen gcc' backend, use '-Wc -ffast-math'

Version
	* Before fbc-1.20.0, an error message would be displayed if -fpmode 
	  FAST was with anything but -fpu SSE.

See also
	* CompilerCmdLineUsing the Command Line
	* CompilerOptfpuCompiler Option: -fpu
	* KeyPgDdfbfpmode__FB_FPMODE__

