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compiler: implement copy directly

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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.
This commit is contained in:
Nia Waldvogel
2025-12-26 19:19:21 -05:00
committed by Nia
parent bc9708f51a
commit a40586d092
17 changed files with 353 additions and 358 deletions
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interp/testdata/copy.out.ll
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64--linux"
@moveDst = local_unnamed_addr global [3 x i8] c"foo"
@copyDst = local_unnamed_addr global [3 x i8] c"foo"
@externalSrc = external local_unnamed_addr global [2 x i8]
@moveExternalDst = local_unnamed_addr global [2 x i8] zeroinitializer
@moveEscapedSrc = global [4 x i8] c"abcd"
@moveEscapedDst = local_unnamed_addr global [4 x i8] zeroinitializer
@volatileSrc = global [2 x i8] c"xy"
@volatileDst = global [2 x i8] zeroinitializer
declare void @use(ptr) local_unnamed_addr
define void @runtime.initAll() local_unnamed_addr {
call void @llvm.memmove.p0.p0.i64(ptr @moveExternalDst, ptr @externalSrc, i64 2, i1 false)
call void @use(ptr @moveEscapedSrc)
call void @llvm.memmove.p0.p0.i64(ptr @moveEscapedDst, ptr @moveEscapedSrc, i64 4, i1 false)
call void @llvm.memcpy.p0.p0.i64(ptr @volatileDst, ptr @volatileSrc, i64 2, i1 true)
ret void
}
declare void @llvm.memmove.p0.p0.i64(ptr nocapture writeonly, ptr nocapture readonly, i64, i1 immarg) #0
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #0
attributes #0 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }