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