derek.holloway
7502bf64a4
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56 lines
2.6 KiB
LLVM
56 lines
2.6 KiB
LLVM
; RUN: llc -mtriple=aarch64-windows %s -o - | FileCheck %s --check-prefixes=CHECK,WIN
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; RUN: llc -mtriple=arm64-apple-ios %s -o - | FileCheck %s --check-prefixes=CHECK,IOS --implicit-check-not=.seh
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; This test verifies that functions requiring Windows CFI that have minimal
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; or no prologue instructions still emit proper SEH directives, specifically
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; ensuring .seh_endprologue is emitted before .seh_startepilogue.
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;
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; This reproduces the issue where Swift async functions with swifttailcc
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; calling convention would fail with:
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; "error: starting epilogue (.seh_startepilogue) before prologue has ended (.seh_endprologue)"
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; Swift-style tail call function with minimal prologue
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define swifttailcc void @test_swifttailcc_minimal(ptr %async_ctx, ptr %arg1, ptr %arg2) {
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; CHECK-LABEL: test_swifttailcc_minimal:
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; CHECK-NOT: .seh_proc test_swifttailcc_minimal
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; CHECK-NOT: .seh_endprologue
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; CHECK-NOT: .seh_startepilogue
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; CHECK-NOT: .seh_endepilogue
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; CHECK-NOT: .seh_endproc
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entry:
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%ptr1 = getelementptr inbounds i8, ptr %async_ctx, i64 16
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%ptr2 = getelementptr inbounds i8, ptr %async_ctx, i64 24
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store ptr %arg1, ptr %ptr1, align 8
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store ptr %arg2, ptr %ptr2, align 8
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musttail call swifttailcc void @external_swift_function(ptr %async_ctx, ptr %arg1)
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ret void
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}
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; Function similar to the original failing case
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define linkonce_odr hidden swifttailcc void @test_linkonce_swifttailcc(ptr swiftasync %async_ctx, ptr %arg1, ptr noalias dereferenceable(40) %arg2, ptr %arg3, i64 %value, ptr %arg4, ptr %arg5, ptr %arg6, i1 %flag, ptr %arg7, ptr noalias dereferenceable(40) %arg8) {
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; CHECK-LABEL: test_linkonce_swifttailcc:
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; IOS-NEXT: .cfi_startproc
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; WIN-NEXT: .seh_proc
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; WIN: .seh_endprologue
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; WIN: .seh_startepilogue
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; WIN: .seh_endepilogue
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; WIN: .seh_endproc
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entry:
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%frame_ptr = getelementptr inbounds nuw i8, ptr %async_ctx, i64 16
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%ctx1 = getelementptr inbounds nuw i8, ptr %async_ctx, i64 400
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%ctx2 = getelementptr inbounds nuw i8, ptr %async_ctx, i64 1168
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%spill1 = getelementptr inbounds nuw i8, ptr %async_ctx, i64 2392
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store ptr %arg8, ptr %spill1, align 8
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%spill2 = getelementptr inbounds nuw i8, ptr %async_ctx, i64 2384
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store ptr %arg7, ptr %spill2, align 8
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%spill3 = getelementptr inbounds nuw i8, ptr %async_ctx, i64 2225
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store i1 %flag, ptr %spill3, align 1
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%spill4 = getelementptr inbounds nuw i8, ptr %async_ctx, i64 2376
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store ptr %arg6, ptr %spill4, align 8
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musttail call swifttailcc void @external_swift_continuation(ptr swiftasync %async_ctx, i64 0, i64 0)
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ret void
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}
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declare swifttailcc void @external_swift_function(ptr, ptr)
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declare swifttailcc void @external_swift_continuation(ptr swiftasync, i64, i64)
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