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347c3e4e9c
Summary: The actual transform i was going after was: https://rise4fun.com/Alive/Tp9H ``` Name: zz Pre: isPowerOf2(C0) && isPowerOf2(C1) && C1 == C0 %t0 = and i8 %x, C0 %r = icmp eq i8 %t0, C1 => %t = icmp eq i8 %t0, 0 %r = xor i1 %t, -1 Name: zz Pre: isPowerOf2(C0) %t0 = and i8 %x, C0 %r = icmp ne i8 %t0, 0 => %t = icmp eq i8 %t0, 0 %r = xor i1 %t, -1 ``` but as it can be seen from the current tests, we already canonicalize most of it, and we are only missing handling multi-use non-canonical icmp predicates. If we have both `!=0` and `==0`, even though we can CSE them, we end up being stuck with them. We should canonicalize to the `==0`. I believe this is one of the cleanup steps i'll need after `-scalarizer` if i end up proceeding with my WIP alloca promotion helper pass. Reviewers: spatel, jdoerfert, nikic Reviewed By: nikic Subscribers: zzheng, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D83139
133 lines
4.5 KiB
LLVM
133 lines
4.5 KiB
LLVM
; REQUIRES: x86-registered-target
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; Test CFI devirtualization through the thin link and backend.
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; RUN: opt -thinlto-bc -thinlto-split-lto-unit -o %t.o %s
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; Legacy PM
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; RUN: llvm-lto2 run %t.o -save-temps -pass-remarks=. \
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; RUN: -whole-program-visibility \
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; RUN: -o %t3 \
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; RUN: -r=%t.o,test,px \
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; RUN: -r=%t.o,_ZN1A1nEi,p \
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; RUN: -r=%t.o,_ZN1B1fEi,p \
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; RUN: -r=%t.o,_ZN1C1fEi,p \
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; RUN: -r=%t.o,empty,p \
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; RUN: -r=%t.o,_ZTV1B, \
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; RUN: -r=%t.o,_ZTV1C, \
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; RUN: -r=%t.o,_ZN1A1nEi, \
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; RUN: -r=%t.o,_ZN1B1fEi, \
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; RUN: -r=%t.o,_ZN1C1fEi, \
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; RUN: -r=%t.o,_ZTV1B,px \
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; RUN: -r=%t.o,_ZTV1C,px 2>&1 | FileCheck %s --check-prefix=REMARK
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; RUN: llvm-dis %t3.1.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR
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; New PM
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; RUN: llvm-lto2 run %t.o -save-temps -use-new-pm -pass-remarks=. \
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; RUN: -whole-program-visibility \
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; RUN: -o %t3 \
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; RUN: -r=%t.o,test,px \
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; RUN: -r=%t.o,_ZN1A1nEi,p \
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; RUN: -r=%t.o,_ZN1B1fEi,p \
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; RUN: -r=%t.o,_ZN1C1fEi,p \
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; RUN: -r=%t.o,empty,p \
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; RUN: -r=%t.o,_ZTV1B, \
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; RUN: -r=%t.o,_ZTV1C, \
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; RUN: -r=%t.o,_ZN1A1nEi, \
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; RUN: -r=%t.o,_ZN1B1fEi, \
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; RUN: -r=%t.o,_ZN1C1fEi, \
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; RUN: -r=%t.o,_ZTV1B,px \
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; RUN: -r=%t.o,_ZTV1C,px 2>&1 | FileCheck %s --check-prefix=REMARK
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; RUN: llvm-dis %t3.1.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR
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; REMARK: single-impl: devirtualized a call to _ZN1A1nEi
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; Next check that we emit an error when trying to LTO link this module
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; containing an llvm.type.checked.load (with a split LTO Unit) with one
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; that does not have a split LTO Unit. Use -thinlto-distributed-indexes
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; to ensure it is being caught in the thin link.
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; RUN: opt -thinlto-bc -o %t2.o %S/Inputs/empty.ll
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; RUN: not llvm-lto2 run %t.o %t2.o -thinlto-distributed-indexes \
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; RUN: -whole-program-visibility \
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; RUN: -o %t3 \
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; RUN: -r=%t.o,test,px \
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; RUN: -r=%t.o,_ZN1A1nEi,p \
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; RUN: -r=%t.o,_ZN1B1fEi,p \
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; RUN: -r=%t.o,_ZN1C1fEi,p \
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; RUN: -r=%t.o,empty,p \
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; RUN: -r=%t.o,_ZTV1B, \
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; RUN: -r=%t.o,_ZTV1C, \
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; RUN: -r=%t.o,_ZN1A1nEi, \
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; RUN: -r=%t.o,_ZN1B1fEi, \
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; RUN: -r=%t.o,_ZN1C1fEi, \
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; RUN: -r=%t.o,_ZTV1B,px \
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; RUN: -r=%t.o,_ZTV1C,px 2>&1 | FileCheck %s --check-prefix=ERROR
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; ERROR: failed: inconsistent LTO Unit splitting (recompile with -fsplit-lto-unit)
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-grtev4-linux-gnu"
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%struct.A = type { i32 (...)** }
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%struct.B = type { %struct.A }
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%struct.C = type { %struct.A }
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@_ZTV1B = constant { [4 x i8*] } { [4 x i8*] [i8* null, i8* undef, i8* bitcast (i32 (%struct.B*, i32)* @_ZN1B1fEi to i8*), i8* bitcast (i32 (%struct.A*, i32)* @_ZN1A1nEi to i8*)] }, !type !0, !type !1
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@_ZTV1C = constant { [4 x i8*] } { [4 x i8*] [i8* null, i8* undef, i8* bitcast (i32 (%struct.C*, i32)* @_ZN1C1fEi to i8*), i8* bitcast (i32 (%struct.A*, i32)* @_ZN1A1nEi to i8*)] }, !type !0, !type !2
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; Put declaration first to test handling of remarks when the first
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; function has no basic blocks.
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declare void @empty()
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; CHECK-IR-LABEL: define i32 @test
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define i32 @test(%struct.A* %obj, i32 %a) {
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entry:
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%0 = bitcast %struct.A* %obj to i8**
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%vtable5 = load i8*, i8** %0
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%1 = tail call { i8*, i1 } @llvm.type.checked.load(i8* %vtable5, i32 8, metadata !"_ZTS1A")
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%2 = extractvalue { i8*, i1 } %1, 1
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br i1 %2, label %cont, label %trap
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trap:
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tail call void @llvm.trap()
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unreachable
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cont:
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%3 = extractvalue { i8*, i1 } %1, 0
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%4 = bitcast i8* %3 to i32 (%struct.A*, i32)*
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; Check that the call was devirtualized.
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; CHECK-IR: %call = tail call i32 @_ZN1A1nEi
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%call = tail call i32 %4(%struct.A* nonnull %obj, i32 %a)
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%vtable16 = load i8*, i8** %0
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%5 = tail call { i8*, i1 } @llvm.type.checked.load(i8* %vtable16, i32 0, metadata !"_ZTS1A")
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%6 = extractvalue { i8*, i1 } %5, 1
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br i1 %6, label %cont2, label %trap
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cont2:
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%7 = extractvalue { i8*, i1 } %5, 0
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%8 = bitcast i8* %7 to i32 (%struct.A*, i32)*
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; Check that traps are conditional. Invalid TYPE_ID can cause
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; unconditional traps.
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; CHECK-IR: br i1 {{.*}}, label %trap, label %cont2
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; We still have to call it as virtual.
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; CHECK-IR: %call3 = tail call i32 %7
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%call3 = tail call i32 %8(%struct.A* nonnull %obj, i32 %call)
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ret i32 %call3
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}
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; CHECK-IR-LABEL: ret i32
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; CHECK-IR-LABEL: }
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declare { i8*, i1 } @llvm.type.checked.load(i8*, i32, metadata)
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declare void @llvm.trap()
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declare i32 @_ZN1B1fEi(%struct.B* %this, i32 %a)
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declare i32 @_ZN1A1nEi(%struct.A* %this, i32 %a)
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declare i32 @_ZN1C1fEi(%struct.C* %this, i32 %a)
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!0 = !{i64 16, !"_ZTS1A"}
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!1 = !{i64 16, !"_ZTS1B"}
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!2 = !{i64 16, !"_ZTS1C"}
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