tree 96ca9d05b3c9a9b2a52045cb6f4a3f6e228d0dca
parent 3bd9f1af8fd8ff81857ae79adec01ae56fb3413f
author Jan Voung <jvoung@chromium.org> 1403642610 -0700
committer Jan Voung <jvoung@chromium.org> 1403642610 -0700

Bitcast of 64-bit immediates may need to split the immediate, not a var.

Currently, the integer immediate is legalized to a
64-bit integer register first, and then the lower/upper
parts of that register are used for the bitcast.
However, mov(64_bit_reg, imm) done by the legalization
isn't legal.

Similarly, trunc of 64-bit immediates need to take the
lower half of the immediate, not legalize to a var first.

This shifts the legalization code around.

Other cases where immediates are illegal and legalized
are idiv/div, but for those cases 64-bit operands are
handled separately via a function call. The function
call code properly splits up immediate arguments.

BUG=none
R=stichnot@chromium.org

Review URL: https://codereview.chromium.org/348373005