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https://github.com/tinygo-org/tinygo.git
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Nia Waldvogel
a40586d092
The compiler now implements the copy builtin directly instead of calling sliceCopy. The length is calculated with the llvm.umax.* intrinsics, and the move is performed by llvm.memmove.*. Both of these operations are easily understood by LLVM's optimization passes. The type's alignment is also provided to llvm.memmove.*, which is useful when rewriting the move. Interp no longer needs to reimplement sliceCopy. Some edge case handling was implemented by sliceCopy but not llvm.memmove.*/llvm.memcpy.*. I copied this over, so copies of external slices should work now. Volatile moves/copies are now run at runtime by interp. There is a 4-byte size increase due to some confusing length logic in sendUSBPacket. I will look at sendUSBPacket in a future PR.
28 lines
1.2 KiB
LLVM
28 lines
1.2 KiB
LLVM
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64--linux"
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@moveDst = local_unnamed_addr global [3 x i8] c"foo"
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@copyDst = local_unnamed_addr global [3 x i8] c"foo"
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@externalSrc = external local_unnamed_addr global [2 x i8]
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@moveExternalDst = local_unnamed_addr global [2 x i8] zeroinitializer
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@moveEscapedSrc = global [4 x i8] c"abcd"
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@moveEscapedDst = local_unnamed_addr global [4 x i8] zeroinitializer
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@volatileSrc = global [2 x i8] c"xy"
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@volatileDst = global [2 x i8] zeroinitializer
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declare void @use(ptr) local_unnamed_addr
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define void @runtime.initAll() local_unnamed_addr {
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call void @llvm.memmove.p0.p0.i64(ptr @moveExternalDst, ptr @externalSrc, i64 2, i1 false)
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call void @use(ptr @moveEscapedSrc)
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call void @llvm.memmove.p0.p0.i64(ptr @moveEscapedDst, ptr @moveEscapedSrc, i64 4, i1 false)
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call void @llvm.memcpy.p0.p0.i64(ptr @volatileDst, ptr @volatileSrc, i64 2, i1 true)
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ret void
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}
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declare void @llvm.memmove.p0.p0.i64(ptr nocapture writeonly, ptr nocapture readonly, i64, i1 immarg) #0
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declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #0
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attributes #0 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
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