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Commit 30b5ba5c authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Will Deacon
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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: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 0cd3defe

arch/arm64/include/asm/assembler.h

+20 −0
Original line number Diff line number Diff line
@@ -221,4 +221,24 @@ lr .req x30 // link register 
	.long	\sym\()_hi32

	.endm



	/*

	 * mov_q - move an immediate constant into a 64-bit register using

	 *         between 2 and 4 movz/movk instructions (depending on the

	 *         magnitude and sign of the operand)

	 */

	.macro	mov_q, reg, val

	.if (((\val) >> 31) == 0 || ((\val) >> 31) == 0x1ffffffff)

	movz	\reg, :abs_g1_s:\val

	.else

	.if (((\val) >> 47) == 0 || ((\val) >> 47) == 0x1ffff)

	movz	\reg, :abs_g2_s:\val

	.else

	movz	\reg, :abs_g3:\val

	movk	\reg, :abs_g2_nc:\val

	.endif

	movk	\reg, :abs_g1_nc:\val

	.endif

	movk	\reg, :abs_g0_nc:\val

	.endm



#endif	/* __ASM_ASSEMBLER_H */