wasm/BinaryTransform: Fix wrong alignment for .load/.store with arguments smaller than 64-bits

This commit is contained in:
Kamil Śliwak 2020-06-05 19:25:47 +02:00
parent 325a78fe47
commit fe0a0802b2
7 changed files with 45 additions and 4 deletions

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@ -336,8 +336,12 @@ bytes BinaryTransform::operator()(BuiltinCall const& _call)
_call.functionName.find(".load") != string::npos ||
_call.functionName.find(".store") != string::npos
)
// alignment and offset
ret += bytes{{3, 0}};
// Alignment hint and offset. Interpreters ignore the alignment. JITs/AOTs can take it
// into account to generate more efficient code but if the hint is invalid it could
// actually be more expensive. It's best to hint at 1-byte alignment if we don't plan
// to control the memory layout accordingly.
ret += bytes{{0, 0}}; // 2^0 == 1-byte alignment
return ret;
}
}

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@ -45,7 +45,7 @@ object "object" {
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Text representation:
(module

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@ -154,7 +154,7 @@ object "object" {
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Text representation:
(module

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@ -0,0 +1 @@
--yul --yul-dialect ewasm --machine ewasm

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@ -0,0 +1 @@
Warning: Yul is still experimental. Please use the output with care.

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@ -0,0 +1,8 @@
object "object" {
code {
function main()
{
i64.store8(0x01:i32, 42:i64)
}
}
}

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@ -0,0 +1,27 @@
======= wasm_to_wasm_memory_instructions_alignment/input.yul (Ewasm) =======
Pretty printed source:
object "object" {
code {
function main()
{ i64.store8(0x01:i32, 42) }
}
}
Binary representation:
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Text representation:
(module
(memory $memory (export "memory") 1)
(export "main" (func $main))
(func $main
(block $label_
(i64.store8 (i32.wrap_i64 (i64.const 1)) (i64.const 42))
)
)
)