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Fixed small issue with constant propagation

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Constants directly assigned to other constants were not propagating:
For instance, in
  local <const> k1 = 10
  local <const> k2 = k1
'k2' were not treated as a compile-time constant.
This commit is contained in:
Roberto Ierusalimschy
2019-07-17 14:50:42 -03:00
parent d6af81084d
commit 8082906c05
2 changed files with 21 additions and 7 deletions
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10
testes/code.lua
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@@ -8,7 +8,8 @@ end
print "testing code generation and optimizations"
-- to test constant propagation
local <const> k0 = 0
local <const> k0aux = 0
local <const> k0 = k0aux
local <const> k1 = 1
local <const> k3 = 3
local <const> k6 = k3 + (k3 << k0)
@@ -410,8 +411,9 @@ checkequal(function () return 6 and true or nil end,
do -- string constants
local <const> k0 = "00000000000000000000000000000000000000000000000000"
local function f1 ()
local <const> k = "00000000000000000000000000000000000000000000000000"
local <const> k = k0
return function ()
return function () return k end
end
@@ -419,8 +421,8 @@ do -- string constants
local f2 = f1()
local f3 = f2()
assert(f3() == string.rep("0", 50))
checkK(f3, f3())
assert(f3() == k0)
checkK(f3, k0)
-- string is not needed by other functions
assert(T.listk(f1)[1] == nil)
assert(T.listk(f2)[1] == nil)