Subzero: Legalize FP constants directly into memory operands.
Previously, the legalize() function would always force a floating point constant into an xmm register before it could be used in an instruction. This uses an extra register unnecessarily when the instruction allows a memory operand for that operand.
We improve this by lowering the FP constant operand to an OperandX8632Mem that wraps a ConstantRelocatable representing the label for the constant pool entry, e.g. [.L$float$0]. (This may end up being copied into an xmm register if the instruction doesn't allow a memory operand for that operand.)
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4095
R=jvoung@chromium.org
Review URL: https://codereview.chromium.org/1163943005
3 files changed
