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| #
3e164dee |
| 23-Jun-2021 |
Hao Sun |
JIT/AArch64: Support shifted immediate (#7165)
* JIT/AArch64: Support shifted immediate
As pointed out by MikePall in [1], shifted immediate value is supported.
See [2]. For exa
JIT/AArch64: Support shifted immediate (#7165)
* JIT/AArch64: Support shifted immediate
As pointed out by MikePall in [1], shifted immediate value is supported.
See [2]. For example, `add x0, x1, #4096` would be encoded by DynASM
into `add x0, x1, #1, lsl #12` directly.
In this patch, a helper is added to check whether an immediate value is
in the two allowed ranges: (1) 0 to 4095, and (2) LSL #12 on all the
values from the first range.
Note that this helper works for add/adds/sub/subs/cmp/cmn instructions.
[1] https://github.com/LuaJIT/LuaJIT/pull/718
[2]
https://github.com/LuaJIT/LuaJIT/blob/v2.1/dynasm/dasm_arm64.lua#L342
Change-Id: I4870048b9b8e6c429b73a4803af2a3b2d5ec0fbb
* Deprecatd CMP_IMM/ADD_SUB_IMM and add test cases
Macros CMP_IMM and ADD_SUB_IMM are deprecated and instead we use
this helper to guard the immediate encoding.
Add two 64-bit only test cases, since 64-bit integers are used
and tested inside.
Change-Id: I0b42d4617b40372e2f4ce5b6ad31a4ddb7d89e49
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