diff options
author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2016-04-18 17:09:44 +0200 |
---|---|---|
committer | Sami Tolvanen <samitolvanen@google.com> | 2016-09-29 10:52:56 -0700 |
commit | 2515432e66e01f632e49069e7c04b969dc13c3d5 (patch) | |
tree | 476dbd405e3c34eb8048c6bb32b221f56dd475ec /arch | |
parent | 29089dcc2c5272437ce9bbdae4ea249ed25e8281 (diff) |
UPSTREAM: 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>
Change-Id: I7e6b684e46cad5df79e6b8bc28d72b9e37daedd6
(cherry picked from commit 30b5ba5cf333cc650e474eaf2cc1ae91bc7cf89f)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Diffstat (limited to 'arch')
-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 70f7b9e04598..9ea846ded55c 100644 --- a/arch/arm64/include/asm/assembler.h +++ b/arch/arm64/include/asm/assembler.h @@ -233,4 +233,24 @@ 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 */ |