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1ad0f74155
In particular, this preserves the kill flag, which allows the Thumb2 cbn?z optimization to be applied in cases where a branch has been re-created after the live variables analysis pass, e.g. by the machine block placement pass. This appears to be low risk; a number of other targets seem to already be doing something similar, e.g. AArch64, PowerPC. Differential Revision: http://reviews.llvm.org/D9184 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235639 91177308-0d34-0410-b5e6-96231b3b80d8
194 lines
9.6 KiB
LLVM
194 lines
9.6 KiB
LLVM
; RUN: llc < %s -O1 -mtriple thumbv7-apple-ios6 | FileCheck %s
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; Just make sure no one tries to make the assumption that the normal edge of an
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; invoke is never a critical edge. Previously, this code would assert.
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%struct.__CFString = type opaque
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declare void @bar(%struct.__CFString*, %struct.__CFString*)
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define noalias i8* @foo(i8* nocapture %inRefURL) noreturn ssp {
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entry:
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%call = tail call %struct.__CFString* @bar3()
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%call2 = invoke i8* @bar2()
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to label %for.cond unwind label %lpad
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for.cond: ; preds = %entry, %for.cond
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invoke void @bar(%struct.__CFString* undef, %struct.__CFString* null)
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to label %for.cond unwind label %lpad5
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lpad: ; preds = %entry
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%0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_sj0 to i8*)
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cleanup
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%1 = extractvalue { i8*, i32 } %0, 0
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%2 = extractvalue { i8*, i32 } %0, 1
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br label %ehcleanup
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lpad5: ; preds = %for.cond
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%3 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_sj0 to i8*)
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cleanup
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%4 = extractvalue { i8*, i32 } %3, 0
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%5 = extractvalue { i8*, i32 } %3, 1
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invoke void @release(i8* %call2)
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to label %ehcleanup unwind label %terminate.lpad.i.i16
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terminate.lpad.i.i16: ; preds = %lpad5
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%6 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_sj0 to i8*)
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catch i8* null
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tail call void @terminatev() noreturn nounwind
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unreachable
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ehcleanup: ; preds = %lpad5, %lpad
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%exn.slot.0 = phi i8* [ %1, %lpad ], [ %4, %lpad5 ]
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%ehselector.slot.0 = phi i32 [ %2, %lpad ], [ %5, %lpad5 ]
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%7 = bitcast %struct.__CFString* %call to i8*
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invoke void @release(i8* %7)
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to label %_ZN5SmartIPK10__CFStringED1Ev.exit unwind label %terminate.lpad.i.i
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terminate.lpad.i.i: ; preds = %ehcleanup
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%8 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_sj0 to i8*)
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catch i8* null
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tail call void @terminatev() noreturn nounwind
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unreachable
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_ZN5SmartIPK10__CFStringED1Ev.exit: ; preds = %ehcleanup
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%lpad.val = insertvalue { i8*, i32 } undef, i8* %exn.slot.0, 0
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%lpad.val12 = insertvalue { i8*, i32 } %lpad.val, i32 %ehselector.slot.0, 1
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resume { i8*, i32 } %lpad.val12
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}
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declare %struct.__CFString* @bar3()
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declare i8* @bar2()
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declare i32 @__gxx_personality_sj0(...)
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declare void @release(i8*)
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declare void @terminatev()
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; Make sure that the instruction DemoteRegToStack inserts to reload
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; %call.i.i.i14.i.i follows the instruction that saves the value to the stack in
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; basic block %entry.do.body.i.i.i_crit_edge.
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; Previously, DemoteRegToStack would insert a load instruction into the entry
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; block to reload %call.i.i.i14.i.i before the phi instruction (%0) in block
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; %do.body.i.i.i.
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; CHECK-LABEL: __Z4foo1c:
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; CHECK: blx __Znwm
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; CHECK: {{.*}}@ %entry.do.body.i.i.i_crit_edge
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; CHECK: str r0, [sp, [[OFFSET:#[0-9]+]]]
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; CHECK: ldr [[R0:r[0-9]+]], [sp, [[OFFSET]]]
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; CHECK: {{.*}}@ %do.body.i.i.i
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; CHECK: cbz [[R0]]
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%"class.std::__1::basic_string" = type { %"class.std::__1::__compressed_pair" }
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%"class.std::__1::__compressed_pair" = type { %"class.std::__1::__libcpp_compressed_pair_imp" }
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%"class.std::__1::__libcpp_compressed_pair_imp" = type { %"struct.std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__rep" }
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%"struct.std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__rep" = type { %union.anon }
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%union.anon = type { %"struct.std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__long" }
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%"struct.std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__long" = type { i32, i32, i8* }
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@.str = private unnamed_addr constant [12 x i8] c"some_string\00", align 1
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define void @_Z4foo1c(i8 signext %a) {
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entry:
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%s1 = alloca %"class.std::__1::basic_string", align 4
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call void @_ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE6__initEPKcm(%"class.std::__1::basic_string"* %s1, i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i32 0, i32 0), i32 11)
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%call.i.i.i14.i.i = invoke noalias i8* @_Znwm(i32 1024)
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to label %do.body.i.i.i unwind label %lpad.body
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do.body.i.i.i: ; preds = %entry, %_ZNSt3__116allocator_traitsINS_9allocatorIcEEE9constructIccEEvRS2_PT_RKT0_.exit.i.i.i
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%lsr.iv = phi i32 [ %lsr.iv.next, %_ZNSt3__116allocator_traitsINS_9allocatorIcEEE9constructIccEEvRS2_PT_RKT0_.exit.i.i.i ], [ -1024, %entry ]
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%0 = phi i8* [ %incdec.ptr.i.i.i, %_ZNSt3__116allocator_traitsINS_9allocatorIcEEE9constructIccEEvRS2_PT_RKT0_.exit.i.i.i ], [ %call.i.i.i14.i.i, %entry ]
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%new.isnull.i.i.i.i = icmp eq i8* %0, null
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br i1 %new.isnull.i.i.i.i, label %_ZNSt3__116allocator_traitsINS_9allocatorIcEEE9constructIccEEvRS2_PT_RKT0_.exit.i.i.i, label %new.notnull.i.i.i.i
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new.notnull.i.i.i.i: ; preds = %do.body.i.i.i
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store i8 %a, i8* %0, align 1
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br label %_ZNSt3__116allocator_traitsINS_9allocatorIcEEE9constructIccEEvRS2_PT_RKT0_.exit.i.i.i
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_ZNSt3__116allocator_traitsINS_9allocatorIcEEE9constructIccEEvRS2_PT_RKT0_.exit.i.i.i: ; preds = %new.notnull.i.i.i.i, %do.body.i.i.i
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%1 = phi i8* [ null, %do.body.i.i.i ], [ %0, %new.notnull.i.i.i.i ]
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%incdec.ptr.i.i.i = getelementptr inbounds i8, i8* %1, i32 1
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%lsr.iv.next = add i32 %lsr.iv, 1
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%cmp.i16.i.i = icmp eq i32 %lsr.iv.next, 0
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br i1 %cmp.i16.i.i, label %invoke.cont, label %do.body.i.i.i
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invoke.cont: ; preds = %_ZNSt3__116allocator_traitsINS_9allocatorIcEEE9constructIccEEvRS2_PT_RKT0_.exit.i.i.i
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invoke void @_Z4foo2Pci(i8* %call.i.i.i14.i.i, i32 1024)
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to label %invoke.cont5 unwind label %lpad2
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invoke.cont5: ; preds = %invoke.cont
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%cmp.i.i.i15 = icmp eq i8* %call.i.i.i14.i.i, null
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br i1 %cmp.i.i.i15, label %invoke.cont6, label %_ZNSt3__113__vector_baseIcNS_9allocatorIcEEE5clearEv.exit.i.i.i19
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_ZNSt3__113__vector_baseIcNS_9allocatorIcEEE5clearEv.exit.i.i.i19: ; preds = %invoke.cont5
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call void @_ZdlPv(i8* %call.i.i.i14.i.i)
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br label %invoke.cont6
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invoke.cont6: ; preds = %_ZNSt3__113__vector_baseIcNS_9allocatorIcEEE5clearEv.exit.i.i.i19, %invoke.cont5
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%call10 = call %"class.std::__1::basic_string"* @_ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEED1Ev(%"class.std::__1::basic_string"* %s1)
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ret void
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lpad.body: ; preds = %entry
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%2 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_sj0 to i8*)
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cleanup
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%3 = extractvalue { i8*, i32 } %2, 0
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%4 = extractvalue { i8*, i32 } %2, 1
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br label %ehcleanup
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lpad2: ; preds = %invoke.cont
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%5 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_sj0 to i8*)
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cleanup
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%6 = extractvalue { i8*, i32 } %5, 0
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%7 = extractvalue { i8*, i32 } %5, 1
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%cmp.i.i.i21 = icmp eq i8* %call.i.i.i14.i.i, null
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br i1 %cmp.i.i.i21, label %ehcleanup, label %_ZNSt3__113__vector_baseIcNS_9allocatorIcEEE5clearEv.exit.i.i.i26
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_ZNSt3__113__vector_baseIcNS_9allocatorIcEEE5clearEv.exit.i.i.i26: ; preds = %lpad2
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call void @_ZdlPv(i8* %call.i.i.i14.i.i)
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br label %ehcleanup
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ehcleanup: ; preds = %_ZNSt3__113__vector_baseIcNS_9allocatorIcEEE5clearEv.exit.i.i.i26, %lpad2, %lpad.body
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%exn.slot.0 = phi i8* [ %3, %lpad.body ], [ %6, %lpad2 ], [ %6, %_ZNSt3__113__vector_baseIcNS_9allocatorIcEEE5clearEv.exit.i.i.i26 ]
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%ehselector.slot.0 = phi i32 [ %4, %lpad.body ], [ %7, %lpad2 ], [ %7, %_ZNSt3__113__vector_baseIcNS_9allocatorIcEEE5clearEv.exit.i.i.i26 ]
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%call12 = invoke %"class.std::__1::basic_string"* @_ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEED1Ev(%"class.std::__1::basic_string"* %s1)
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to label %eh.resume unwind label %terminate.lpad
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eh.resume: ; preds = %ehcleanup
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%lpad.val = insertvalue { i8*, i32 } undef, i8* %exn.slot.0, 0
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%lpad.val13 = insertvalue { i8*, i32 } %lpad.val, i32 %ehselector.slot.0, 1
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resume { i8*, i32 } %lpad.val13
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terminate.lpad: ; preds = %ehcleanup
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%8 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_sj0 to i8*)
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catch i8* null
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%9 = extractvalue { i8*, i32 } %8, 0
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call void @__clang_call_terminate(i8* %9)
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unreachable
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}
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declare void @_Z4foo2Pci(i8*, i32)
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define linkonce_odr hidden void @__clang_call_terminate(i8*) {
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%2 = tail call i8* @__cxa_begin_catch(i8* %0)
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tail call void @_ZSt9terminatev()
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unreachable
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}
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declare i8* @__cxa_begin_catch(i8*)
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declare void @_ZSt9terminatev()
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declare %"class.std::__1::basic_string"* @_ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEED1Ev(%"class.std::__1::basic_string"* returned)
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declare void @_ZdlPv(i8*) #3
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declare noalias i8* @_Znwm(i32)
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declare void @_ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE6__initEPKcm(%"class.std::__1::basic_string"*, i8*, i32)
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declare void @_Unwind_SjLj_Register({ i8*, i32, [4 x i32], i8*, i8*, [5 x i8*] }*)
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declare void @_Unwind_SjLj_Unregister({ i8*, i32, [4 x i32], i8*, i8*, [5 x i8*] }*)
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declare i8* @llvm.frameaddress(i32)
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declare i8* @llvm.stacksave()
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declare void @llvm.stackrestore(i8*)
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declare i32 @llvm.eh.sjlj.setjmp(i8*)
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declare i8* @llvm.eh.sjlj.lsda()
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declare void @llvm.eh.sjlj.callsite(i32)
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declare void @llvm.eh.sjlj.functioncontext(i8*)
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