llvm::FlushFPConstant

Flush a floating‐point constant according to the parent function's denormal mode.

Synopsis

Declared in <llvm/Analysis/ConstantFolding.h>

Constant*
FlushFPConstant(
    Constant* Operand,
    Instruction const* I,
    bool IsOutput);

Description

If so, return a zero with the correct sign, otherwise return the original constant. Inputs and outputs to floating point instructions can have their mode set separately, so the direction is also needed.

If the calling function's denormal_fpenv input mode is dynamic for the floating‐point type, returns nullptr for denormal inputs.

Return Value

A correctly signed zero if flushed, Operand otherwise, or null for denormal inputs under a dynamic denormal_fpenv mode.

Parameters

Name

Description

Operand

Floating‐point constant to possibly flush.

Instruction whose parent function supplies denormal mode.

IsOutput

True if flushing an output; false if flushing an input.

Created with MrDocs