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DynASM/ARM64: Fix LSL/BFI* encoding with variable shifts.

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Thanks to Dmitry Stogov.
This commit is contained in:
Mike Pall 2021-06-04 13:51:56 +02:00
parent 52449e2a1e
commit 4216bdfb2a
1 changed files with 8 additions and 6 deletions
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14
dynasm/dasm_arm64.lua
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@ -640,10 +640,10 @@ end
local function alias_bfiz(p)
parse_reg(p[1], 0)
if parse_reg_type == "w" then
p[3] = "#-("..p[3]:sub(2)..")%32"
p[3] = "#(32-("..p[3]:sub(2).."))%32"
p[4] = "#("..p[4]:sub(2)..")-1"
else
p[3] = "#-("..p[3]:sub(2)..")%64"
p[3] = "#(64-("..p[3]:sub(2).."))%64"
p[4] = "#("..p[4]:sub(2)..")-1"
end
end
@ -652,10 +652,10 @@ local alias_lslimm = op_alias("ubfm_4", function(p)
parse_reg(p[1], 0)
local sh = p[3]:sub(2)
if parse_reg_type == "w" then
p[3] = "#-("..sh..")%32"
p[3] = "#(32-("..sh.."))%32"
p[4] = "#31-("..sh..")"
else
p[3] = "#-("..sh..")%64"
p[3] = "#(64-("..sh.."))%64"
p[4] = "#63-("..sh..")"
end
end)
@ -1001,8 +1001,8 @@ function op_template(params, template, nparams)
if not params then return template:gsub("%x%x%x%x%x%x%x%x", "") end
-- Limit number of section buffer positions used by a single dasm_put().
-- A single opcode needs a maximum of 3 positions.
if secpos+3 > maxsecpos then wflush() end
-- A single opcode needs a maximum of 4 positions.
if secpos+4 > maxsecpos then wflush() end
local pos = wpos()
local lpos, apos, spos = #actlist, #actargs, secpos
@ -1014,9 +1014,11 @@ function op_template(params, template, nparams)
actlist[lpos+1] = nil
actlist[lpos+2] = nil
actlist[lpos+3] = nil
actlist[lpos+4] = nil
actargs[apos+1] = nil
actargs[apos+2] = nil
actargs[apos+3] = nil
actargs[apos+4] = nil
end
error(err, 0)
end