arm64: introduce mov_q macro to move a constant into a 64-bit register
Implement a macro mov_q that can be used to move an immediate constant into a 64-bit register, using between 2 and 4 movz/movk instructions (depending on the operand) Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
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@ -221,4 +221,24 @@ lr .req x30 // link register
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.long \sym\()_hi32
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.long \sym\()_hi32
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.endm
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.endm
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/*
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* mov_q - move an immediate constant into a 64-bit register using
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* between 2 and 4 movz/movk instructions (depending on the
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* magnitude and sign of the operand)
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*/
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.macro mov_q, reg, val
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.if (((\val) >> 31) == 0 || ((\val) >> 31) == 0x1ffffffff)
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movz \reg, :abs_g1_s:\val
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.else
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.if (((\val) >> 47) == 0 || ((\val) >> 47) == 0x1ffff)
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movz \reg, :abs_g2_s:\val
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.else
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movz \reg, :abs_g3:\val
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movk \reg, :abs_g2_nc:\val
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.endif
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movk \reg, :abs_g1_nc:\val
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.endif
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movk \reg, :abs_g0_nc:\val
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.endm
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#endif /* __ASM_ASSEMBLER_H */
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#endif /* __ASM_ASSEMBLER_H */
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