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compiler: Comments

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This commit is contained in:
Ayke van Laethem
2018-05-05 18:32:58 +02:00
parent 84b45a33f1
commit 877d0817ea
1 changed files with 7 additions and 7 deletions
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tgo.go
+7 -7
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@@ -832,8 +832,8 @@ func (c *Compiler) parseExpr(frame *Frame, expr ssa.Value) (llvm.Value, error) {
return llvm.Value{}, errors.New("todo: indexaddr: len")
}
// Bounds check
// TODO: inline, and avoid if possible
// Bounds check.
// LLVM optimizes this away in most cases.
constZero := llvm.ConstInt(c.intType, 0, false)
isNegative := c.builder.CreateICmp(llvm.IntSLT, index, constZero, "") // index < 0
isTooBig := c.builder.CreateICmp(llvm.IntSGE, index, buflen, "") // index >= len(value)
@@ -865,8 +865,8 @@ func (c *Compiler) parseExpr(frame *Frame, expr ssa.Value) (llvm.Value, error) {
return llvm.Value{}, nil
}
// Bounds check
// TODO: inline, and avoid if possible
// Bounds check.
// LLVM optimizes this away in most cases.
if frame.llvmFn.Name() != "runtime.boundsCheck" {
constZero := llvm.ConstInt(c.intType, 0, false)
isNegative := c.builder.CreateICmp(llvm.IntSLT, index, constZero, "") // index < 0
@@ -1134,11 +1134,11 @@ func (c *Compiler) parseUnOp(frame *Frame, unop *ssa.UnOp) (llvm.Value, error) {
return llvm.Value{}, err
}
switch unop.Op {
case token.NOT: // !
case token.NOT: // !x
return c.builder.CreateNot(x, ""), nil
case token.SUB: // -num
case token.SUB: // -x
return c.builder.CreateSub(llvm.ConstInt(x.Type(), 0, false), x, ""), nil
case token.MUL: // *ptr, dereference pointer
case token.MUL: // *x, dereference pointer
return c.builder.CreateLoad(x, ""), nil
default:
return llvm.Value{}, errors.New("todo: unknown unop")