76 lines
2.9 KiB
LLVM
76 lines
2.9 KiB
LLVM
; RUN: llc -regalloc=greedy -mtriple=x86_64-pc-windows-msvc < %s -o - | FileCheck %s
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; This test checks for proper handling of a condition where the greedy register
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; allocator encounters a very short interval that contains no uses but does
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; contain an EH pad unwind edge, which requires spilling. Previously the
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; register allocator marked a interval like this as unspillable, resulting in
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; a compilation failure.
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; The following checks that the value %p is reloaded within the catch handler.
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; CHECK-LABEL: "?catch$8@?0?test@4HA":
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; CHECK: .seh_endprologue
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; CHECK: movq -16(%rbp), %rax
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; CHECK: movb $0, (%rax)
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define i32* @test(i32* %a) personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
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entry:
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%call = call i32 @f()
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%p = bitcast i32* %a to i8*
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br i1 undef, label %if.end, label %if.else
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if.else: ; preds = %entry
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br i1 undef, label %cond.false.i, label %if.else.else
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if.else.else: ; preds = %if.else
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br i1 undef, label %cond.true.i, label %cond.false.i
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cond.true.i: ; preds = %if.else.else
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br label %invoke.cont
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cond.false.i: ; preds = %if.else.else, %if.else
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%call.i = invoke i32 @f()
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to label %invoke.cont unwind label %catch.dispatch
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catch.dispatch: ; preds = %cond.false.i
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%tmp0 = catchswitch within none [label %catch] unwind label %ehcleanup
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catch: ; preds = %catch.dispatch
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%tmp1 = catchpad within %tmp0 [i8* null, i32 64, i8* null]
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%p.0 = getelementptr inbounds i8, i8* %p, i64 0
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store i8 0, i8* %p.0, align 8
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invoke void @_CxxThrowException(i8* null, %eh.ThrowInfo* null) [ "funclet"(token %tmp1) ]
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to label %noexc unwind label %ehcleanup
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noexc: ; preds = %catch
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unreachable
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invoke.cont: ; preds = %cond.false.i, %cond.true.i
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%cond.i = phi i32 [ %call, %cond.true.i ], [ %call.i, %cond.false.i ]
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%cmp = icmp eq i32 %cond.i, -1
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%tmp3 = select i1 %cmp, i32 4, i32 0
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br label %if.end
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if.end: ; preds = %invoke.cont, %entry
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%state.0 = phi i32 [ %tmp3, %invoke.cont ], [ 4, %entry ]
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%p.1 = getelementptr inbounds i8, i8* %p, i64 0
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invoke void @g(i8* %p.1, i32 %state.0)
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to label %invoke.cont.1 unwind label %ehcleanup
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invoke.cont.1: ; preds = %if.end
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ret i32* %a
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ehcleanup: ; preds = %if.end, %catch, %catch.dispatch
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%tmp4 = cleanuppad within none []
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cleanupret from %tmp4 unwind to caller
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}
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%eh.ThrowInfo = type { i32, i32, i32, i32 }
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declare i32 @__CxxFrameHandler3(...)
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declare void @_CxxThrowException(i8*, %eh.ThrowInfo*)
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declare i32 @f()
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declare void @g(i8*, i32)
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