llvm::TargetInstrInfo::isSubregFoldable

Check whether the target can fold a load that feeds a subreg operand (or a subreg operand that feeds a store). For example, X86 may want to return true if it can fold movl (%esp), %eax subb, %al, ... Into: subb (%esp), ...

Synopsis

Declared in <llvm/CodeGen/TargetInstrInfo.h>

virtual
bool
isSubregFoldable() const;

Description

Ideally, we'd like the target implementation of foldMemoryOperand() to reject subregs ‐ but since this behavior used to be enforced in the target‐independent code, moving this responsibility to the targets has the potential of causing nasty silent breakage in out‐of‐tree targets.

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