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compiler: use Clang data layout for complex numbers

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Match data layout of complex numbers to that of Clang, for better
interoperability. This makes alignment of complex numbes the same as the
individual elements (real and imaginary), as is required by the C spec
and implemented in Clang, but unlike the gc compler. The Go language
specification is silent on this matter.

> Each complex type has the same object representation and alignment
> requirements as an array of two elements of the corresponding real
> type (float for float complex, double for double complex, long double
> for long double complex). The first element of the array holds the
> real part, and the second element of the array holds the imaginary
> component.

Source: https://en.cppreference.com/w/c/language/arithmetic_types
This commit is contained in:
Ayke van Laethem
2019-02-08 19:42:24 +01:00
committed by Ron Evans
parent 0a3dbbd1cb
commit fab38a0749
2 changed files with 29 additions and 43 deletions
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compiler/interface.go
+1 -1
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@@ -53,7 +53,7 @@ func (c *Compiler) parseMakeInterface(val llvm.Value, typ types.Type, global str
itfValue = c.builder.CreateIntToPtr(val, c.i8ptrType, "makeinterface.cast.int")
case llvm.PointerTypeKind:
itfValue = c.builder.CreateBitCast(val, c.i8ptrType, "makeinterface.cast.ptr")
case llvm.StructTypeKind, llvm.FloatTypeKind, llvm.DoubleTypeKind, llvm.VectorTypeKind:
case llvm.StructTypeKind, llvm.FloatTypeKind, llvm.DoubleTypeKind:
// A bitcast would be useful here, but bitcast doesn't allow
// aggregate types. So we'll bitcast it using an alloca.
// Hopefully this will get optimized away.