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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2016-04-18 17:09:44 +0200 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2016-04-26 12:22:59 +0100 |
| commit | 30b5ba5cf333cc650e474eaf2cc1ae91bc7cf89f (patch) | |
| tree | 4a812bfdf836f1f8e59e7f8d4c67ef7a52f2758b | |
| parent | 0cd3defe0af4153ffc5fe39bcfa4abfc301984e9 (diff) | |
| download | lwn-30b5ba5cf333cc650e474eaf2cc1ae91bc7cf89f.tar.gz lwn-30b5ba5cf333cc650e474eaf2cc1ae91bc7cf89f.zip | |
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>
| -rw-r--r-- | arch/arm64/include/asm/assembler.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h index 972fb55af9f1..f9b6f7af75ac 100644 --- a/arch/arm64/include/asm/assembler.h +++ b/arch/arm64/include/asm/assembler.h @@ -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 */ |