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a4097cc6b1
Use subreg_hNN and subreg_lNN for the high and low NN bits of a register. List the low registers first, so that subreg_l32 also means the low 32 bits of a 128-bit register. Floats are stored in the upper 32 bits of a 64-bit register, so they should use subreg_h32 rather than subreg_l32. No behavioral change intended. llvm-svn: 191659
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