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x86inc: Prefer r14/r15 over r12/r13 on x86-64

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Due to a peculiarity in the ModR/M addressing encoding, the r12 and r13
registers sometimes requires an additional byte when used as a base register.

r14 and r15 doesn't have that issue, so prefer using them.
This commit is contained in:
Henrik Gramner 2017-04-22 20:30:35 +02:00 committed by James Darnley
parent 88dcdfad09
commit cd4ca82459
1 changed files with 8 additions and 8 deletions
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16
libavutil/x86/x86inc.asm
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@ -426,10 +426,10 @@ DECLARE_REG 7, rdi, 64
DECLARE_REG 8, rsi, 72
DECLARE_REG 9, rbx, 80
DECLARE_REG 10, rbp, 88
DECLARE_REG 11, R12, 96
DECLARE_REG 12, R13, 104
DECLARE_REG 13, R14, 112
DECLARE_REG 14, R15, 120
DECLARE_REG 11, R14, 96
DECLARE_REG 12, R15, 104
DECLARE_REG 13, R12, 112
DECLARE_REG 14, R13, 120
%macro PROLOGUE 2-5+ 0 ; #args, #regs, #xmm_regs, [stack_size,] arg_names...
%assign num_args %1
@ -530,10 +530,10 @@ DECLARE_REG 7, R10, 16
DECLARE_REG 8, R11, 24
DECLARE_REG 9, rbx, 32
DECLARE_REG 10, rbp, 40
DECLARE_REG 11, R12, 48
DECLARE_REG 12, R13, 56
DECLARE_REG 13, R14, 64
DECLARE_REG 14, R15, 72
DECLARE_REG 11, R14, 48
DECLARE_REG 12, R15, 56
DECLARE_REG 13, R12, 64
DECLARE_REG 14, R13, 72
%macro PROLOGUE 2-5+ ; #args, #regs, #xmm_regs, [stack_size,] arg_names...
%assign num_args %1