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compiler: align and zero-initialize stack allocated values

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This commit is contained in:
Ayke van Laethem
2018-10-12 16:57:17 +02:00
parent 2917347ff5
commit 25e73a5439
1 changed files with 5 additions and 2 deletions
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compiler/optimizer.go
+5 -2
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@@ -139,9 +139,12 @@ func (c *Compiler) OptimizeAllocs() {
// promote it to a SSA value.
fn := bitcast.InstructionParent().Parent()
c.builder.SetInsertPointBefore(fn.EntryBasicBlock().FirstInstruction())
allocaType := llvm.ArrayType(llvm.Int8Type(), int(size))
// TODO: alignment?
alignment := c.targetData.ABITypeAlignment(c.i8ptrType)
sizeInWords := (size + uint64(alignment) - 1) / uint64(alignment)
allocaType := llvm.ArrayType(c.ctx.IntType(alignment*8), int(sizeInWords))
alloca := c.builder.CreateAlloca(allocaType, "stackalloc.alloca")
zero, _ := c.getZeroValue(alloca.Type().ElementType())
c.builder.CreateStore(zero, alloca)
stackalloc := c.builder.CreateBitCast(alloca, bitcast.Type(), "stackalloc")
bitcast.ReplaceAllUsesWith(stackalloc)
if heapalloc != bitcast {