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compiler: remove support for memory references in AsmFull

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Memory references (`*m` in LLVM IR inline assembly) need a pointer type
starting in LLVM 14. This is a bit inconvenient and requires a new API
in the go-llvm package.

Instead of doing that, I'd like to remove support for memory references
from AsmFull (and possibly AsmFull entirely if possible: it's hard to
use correctly).

This breaks tinygo.org/x/drivers/ws2812 for AVR, ARM, and RISC-V which
need to be updated. Probably using CGo.
This commit is contained in:
Ayke van Laethem
2022-04-20 14:20:03 +02:00
committed by Ron Evans
parent 52233790cc
commit cad6a57077
2 changed files with 8 additions and 5 deletions
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compiler/inlineasm.go
+4 -1
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@@ -98,7 +98,10 @@ func (b *builder) createInlineAsmFull(instr *ssa.CallCommon) (llvm.Value, error)
case llvm.IntegerTypeKind:
constraints = append(constraints, "r")
case llvm.PointerTypeKind:
constraints = append(constraints, "*m")
// Memory references require a type in LLVM 14, probably as a
// preparation for opaque pointers.
err = b.makeError(instr.Pos(), "support for pointer operands was dropped in TinyGo 0.23")
return s
default:
err = b.makeError(instr.Pos(), "unknown type in inline assembly for value: "+name)
return s