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Implement shifting with a differently-sized integer

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Ayke van Laethem
2018-08-22 04:35:25 +02:00
parent 337e48270b
commit 8fb9cd4e23
1 changed files with 19 additions and 7 deletions
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compiler.go
+19 -7
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@@ -1530,13 +1530,25 @@ func (c *Compiler) parseBinOp(frame *Frame, binop *ssa.BinOp) (llvm.Value, error
return c.builder.CreateOr(x, y, ""), nil
case token.XOR: // ^
return c.builder.CreateXor(x, y, ""), nil
case token.SHL: // <<
return c.builder.CreateShl(x, y, ""), nil
case token.SHR: // >>
if signed {
return c.builder.CreateAShr(x, y, ""), nil
} else {
return c.builder.CreateLShr(x, y, ""), nil
case token.SHL, token.SHR:
sizeX := c.targetData.TypeAllocSize(x.Type())
sizeY := c.targetData.TypeAllocSize(y.Type())
if sizeX > sizeY {
// x and y must have equal sizes, make Y bigger in this case.
// y is unsigned, this has been checked by the Go type checker.
y = c.builder.CreateZExt(y, x.Type(), "")
}
switch binop.Op {
case token.SHL: // <<
return c.builder.CreateShl(x, y, ""), nil
case token.SHR: // >>
if signed {
return c.builder.CreateAShr(x, y, ""), nil
} else {
return c.builder.CreateLShr(x, y, ""), nil
}
default:
panic("unreachable")
}
case token.AND_NOT: // &^
// Go specific. Calculate "and not" with x & (~y)