51 lines
1.3 KiB
Python
51 lines
1.3 KiB
Python
from peachpy import *
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from peachpy.x86_64 import *
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def fp16_alt_xmm_to_fp32_xmm(xmm_half):
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xmm_zero = XMMRegister()
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VPXOR(xmm_zero, xmm_zero, xmm_zero)
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xmm_word = XMMRegister()
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VPUNPCKLWD(xmm_word, xmm_zero, xmm_half)
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xmm_shl1_half = XMMRegister()
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VPADDW(xmm_shl1_half, xmm_half, xmm_half)
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xmm_shl1_nonsign = XMMRegister()
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VPADDD(xmm_shl1_nonsign, xmm_word, xmm_word)
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sign_mask = Constant.float32x4(-0.0)
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xmm_sign = XMMRegister()
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VANDPS(xmm_sign, xmm_word, sign_mask)
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xmm_shr3_nonsign = XMMRegister()
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VPSRLD(xmm_shr3_nonsign, xmm_shl1_nonsign, 4)
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exp_offset = Constant.uint32x4(0x38000000)
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xmm_norm_nonsign = XMMRegister()
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VPADDD(xmm_norm_nonsign, xmm_shr3_nonsign, exp_offset)
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magic_mask = Constant.uint16x8(0x3E80)
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xmm_denorm_nonsign = XMMRegister()
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VPUNPCKLWD(xmm_denorm_nonsign, xmm_shl1_half, magic_mask)
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magic_bias = Constant.float32x4(0.25)
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VSUBPS(xmm_denorm_nonsign, xmm_denorm_nonsign, magic_bias)
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xmm_denorm_cutoff = XMMRegister()
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VMOVDQA(xmm_denorm_cutoff, Constant.uint32x4(0x00800000))
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xmm_denorm_mask = XMMRegister()
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VPCMPGTD(xmm_denorm_mask, xmm_denorm_cutoff, xmm_shr3_nonsign)
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xmm_nonsign = XMMRegister()
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VBLENDVPS(xmm_nonsign, xmm_norm_nonsign, xmm_denorm_nonsign, xmm_denorm_mask)
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xmm_float = XMMRegister()
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VORPS(xmm_float, xmm_nonsign, xmm_sign)
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return xmm_float
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