fp-speculation, Qfp-speculation

Tells the compiler the mode in which to speculate on floating-point operations.

IDE Equivalent

Windows: C/C++ > Optimization > Floating-Point Speculation

Linux: Floating Point > Floating-Point Speculation

Mac OS: None

Architectures

IA-32 architecture, Intel® 64 architecture, IA-64 architecture

Syntax

Linux and Mac OS:	-fp-speculation=mode
Windows:	/Qfp-speculation=mode

Arguments

mode	Is the mode for floating-point operations. Possible values are:
	fast	Tells the compiler to speculate on floating-point operations.
	safe	Tells the compiler to disable speculation if there is a possibility that the speculation may cause a floating-point exception.
	strict	Tells the compiler to disable speculation on floating-point operations.
	off	This is the same as specifying strict.

Default

-fp-speculation=fast or
/Qfp-speculation=fast

The compiler speculates on floating-point operations. This is also the behavior when optimizations are enabled. However, if you specify no optimizations (-O0 on Linux; /Od on Windows), the default is -fp-speculation=safe (Linux) or /Qfp-speculation=safe (Windows).

Description

This option tells the compiler the mode in which to speculate on floating-point operations.

Alternate Options

Linux: -IPF-fp-speculation (systems using IA-64 architecture only)
Mac OS: None
Windows: /QIPF-fp-speculation (systems using IA-64 architecture only)