135 lines
5.3 KiB
LLVM
135 lines
5.3 KiB
LLVM
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128-ni:1"
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target triple = "wasm32-unknown-unknown"
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%struct.quux = type { i32 }
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%struct.blam = type <{ %struct.quux }>
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declare void @foo()
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declare void @bar(%struct.quux*)
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declare i32 @baz()
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declare i32 @__gxx_wasm_personality_v0(...)
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; Function Attrs: noreturn
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declare void @llvm.wasm.rethrow() #0
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; Test that a PHI in catchswitch BB are excluded from combining into a non-PHI
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; instruction.
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define void @test0(i1 %c1) personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
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bb:
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%tmp0 = alloca %struct.blam, align 4
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br i1 %c1, label %bb1, label %bb2
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bb1: ; preds = %bb
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%tmp1 = getelementptr inbounds %struct.blam, %struct.blam* %tmp0, i32 0, i32 0
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invoke void @foo()
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to label %bb3 unwind label %bb4
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bb2: ; preds = %bb
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%tmp2 = getelementptr inbounds %struct.blam, %struct.blam* %tmp0, i32 0, i32 0
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invoke void @foo()
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to label %bb3 unwind label %bb4
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bb3: ; preds = %bb2, %bb1
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unreachable
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bb4: ; preds = %bb2, %bb1
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; This PHI should not be combined into a non-PHI instruction, because
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; catchswitch BB cannot have any non-PHI instruction other than catchswitch
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; itself.
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; CHECK: bb4:
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; CHECK-NEXT: phi
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; CHECK-NEXT: catchswitch
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%tmp3 = phi %struct.quux* [ %tmp1, %bb1 ], [ %tmp2, %bb2 ]
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%tmp4 = catchswitch within none [label %bb5] unwind label %bb7
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bb5: ; preds = %bb4
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%tmp5 = catchpad within %tmp4 [i8* null]
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invoke void @foo() [ "funclet"(token %tmp5) ]
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to label %bb6 unwind label %bb7
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bb6: ; preds = %bb5
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unreachable
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bb7: ; preds = %bb5, %bb4
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%tmp6 = cleanuppad within none []
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call void @bar(%struct.quux* %tmp3) [ "funclet"(token %tmp6) ]
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unreachable
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}
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; Test that slicing-up of illegal integer type PHI does not happen in catchswitch
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; BBs, which can't have any non-PHI instruction before the catchswitch.
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define void @test1() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
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entry:
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invoke void @foo()
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to label %invoke.cont unwind label %catch.dispatch1
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invoke.cont: ; preds = %entry
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%call = invoke i32 @baz()
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to label %invoke.cont1 unwind label %catch.dispatch
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invoke.cont1: ; preds = %invoke.cont
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%tobool = icmp ne i32 %call, 0
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br i1 %tobool, label %if.then, label %if.end
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if.then: ; preds = %invoke.cont1
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br label %if.end
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if.end: ; preds = %if.then, %invoke.cont1
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%ap.0 = phi i8 [ 1, %if.then ], [ 0, %invoke.cont1 ]
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invoke void @foo()
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to label %invoke.cont2 unwind label %catch.dispatch
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invoke.cont2: ; preds = %if.end
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br label %try.cont
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catch.dispatch: ; preds = %if.end, %invoke.cont
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; %ap.2 in catch.dispatch1 BB has an illegal integer type (i8) in the data
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; layout, and it is only used by trunc or trunc(lshr) operations. In this case
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; InstCombine will split this PHI in its predecessors, which include this
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; catch.dispatch BB. This splitting involves creating non-PHI instructions,
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; such as 'and' or 'icmp' in this BB, which is not valid for a catchswitch BB.
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; So if one of sliced-up PHI's predecessor is a catchswitch block, we don't
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; optimize that case and bail out. This BB should be preserved intact after
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; InstCombine and the pass shouldn't produce invalid code.
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; CHECK: catch.dispatch:
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; CHECK-NEXT: phi
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; CHECK-NEXT: catchswitch
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%ap.1 = phi i8 [ %ap.0, %if.end ], [ 0, %invoke.cont ]
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%tmp0 = catchswitch within none [label %catch.start] unwind label %catch.dispatch1
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catch.start: ; preds = %catch.dispatch
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%tmp1 = catchpad within %tmp0 [i8* null]
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br i1 0, label %catch, label %rethrow
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catch: ; preds = %catch.start
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catchret from %tmp1 to label %try.cont
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rethrow: ; preds = %catch.start
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invoke void @llvm.wasm.rethrow() #0 [ "funclet"(token %tmp1) ]
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to label %unreachable unwind label %catch.dispatch1
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catch.dispatch1: ; preds = %rethrow, %catch.dispatch, %entry
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%ap.2 = phi i8 [ %ap.1, %catch.dispatch ], [ %ap.1, %rethrow ], [ 0, %entry ]
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%tmp2 = catchswitch within none [label %catch.start1] unwind to caller
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catch.start1: ; preds = %catch.dispatch1
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%tmp3 = catchpad within %tmp2 [i8* null]
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%tobool1 = trunc i8 %ap.2 to i1
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br i1 %tobool1, label %if.then1, label %if.end1
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if.then1: ; preds = %catch.start1
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br label %if.end1
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if.end1: ; preds = %if.then1, %catch.start1
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catchret from %tmp3 to label %try.cont
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try.cont: ; preds = %if.end1, %catch, %invoke.cont2
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ret void
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unreachable: ; preds = %rethrow
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unreachable
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}
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attributes #0 = { noreturn }
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