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54 lines
1.4 KiB
54 lines
1.4 KiB
4 months ago
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from peachpy import *
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from peachpy.x86_64 import *
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def fp16_alt_xmm_to_fp32_ymm(xmm_half):
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ymm_half = YMMRegister()
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VPERMQ(ymm_half, xmm_half.as_ymm, 0b01010000)
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ymm_zero = YMMRegister()
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VPXOR(ymm_zero.as_xmm, ymm_zero.as_xmm, ymm_zero.as_xmm)
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ymm_word = YMMRegister()
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VPUNPCKLWD(ymm_word, ymm_zero, ymm_half)
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ymm_shl1_half = YMMRegister()
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VPADDW(ymm_shl1_half, ymm_half, ymm_half)
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ymm_shl1_nonsign = YMMRegister()
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VPADDD(ymm_shl1_nonsign, ymm_word, ymm_word)
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sign_mask = Constant.float32x8(-0.0)
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ymm_sign = YMMRegister()
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VANDPS(ymm_sign, ymm_word, sign_mask)
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ymm_shr3_nonsign = YMMRegister()
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VPSRLD(ymm_shr3_nonsign, ymm_shl1_nonsign, 4)
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exp_offset = Constant.uint32x8(0x38000000)
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ymm_norm_nonsign = YMMRegister()
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VPADDD(ymm_norm_nonsign, ymm_shr3_nonsign, exp_offset)
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magic_mask = Constant.uint16x16(0x3E80)
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ymm_denorm_nonsign = YMMRegister()
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VPUNPCKLWD(ymm_denorm_nonsign, ymm_shl1_half, magic_mask)
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magic_bias = Constant.float32x8(0.25)
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VSUBPS(ymm_denorm_nonsign, ymm_denorm_nonsign, magic_bias)
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ymm_denorm_cutoff = YMMRegister()
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VMOVDQA(ymm_denorm_cutoff, Constant.uint32x8(0x00800000))
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ymm_denorm_mask = YMMRegister()
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VPCMPGTD(ymm_denorm_mask, ymm_denorm_cutoff, ymm_shr3_nonsign)
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ymm_nonsign = YMMRegister()
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VBLENDVPS(ymm_nonsign, ymm_norm_nonsign, ymm_denorm_nonsign, ymm_denorm_mask)
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ymm_float = YMMRegister()
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VORPS(ymm_float, ymm_nonsign, ymm_sign)
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return ymm_float
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