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IR: Function summary extensions for whole-program devirtualization pass.

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The summary information includes all uses of llvm.type.test and
llvm.type.checked.load intrinsics that can be used to devirtualize calls,
including any constant arguments for virtual constant propagation.

Differential Revision: https://reviews.llvm.org/D29734

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294795 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne
2017-02-10 22:29:38 +00:00
parent 53c27da76d
commit 446f8d76cd
8 changed files with 426 additions and 35 deletions
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test/Bitcode/thinlto-type-vcalls.ll
+105
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; RUN: opt -module-summary %s -o %t.o
; RUN: llvm-bcanalyzer -dump %t.o | FileCheck %s
; RUN: llvm-lto -thinlto -o %t2 %t.o
; RUN: llvm-bcanalyzer -dump %t2.thinlto.bc | FileCheck --check-prefix=COMBINED %s
target datalayout = "e-p:64:64"
target triple = "x86_64-unknown-linux-gnu"
; COMBINED: <TYPE_TEST_ASSUME_VCALLS op0=6699318081062747564 op1=16/>
; COMBINED-NEXT: <COMBINED
; COMBINED-NEXT: <TYPE_CHECKED_LOAD_VCALLS op0=6699318081062747564 op1=16/>
; COMBINED-NEXT: <COMBINED
; COMBINED-NEXT: <TYPE_TEST_ASSUME_VCALLS op0=6699318081062747564 op1=24 op2=-2012135647395072713 op3=32/>
; COMBINED-NEXT: <COMBINED
; COMBINED-NEXT: <TYPE_TEST_ASSUME_CONST_VCALL op0=6699318081062747564 op1=16 op2=42/>
; COMBINED-NEXT: <TYPE_TEST_ASSUME_CONST_VCALL op0=6699318081062747564 op1=24 op2=43/>
; COMBINED-NEXT: <COMBINED
; COMBINED-NEXT: <TYPE_CHECKED_LOAD_CONST_VCALL op0=6699318081062747564 op1=16 op2=42/>
; COMBINED-NEXT: <COMBINED
; COMBINED-NEXT: <TYPE_TESTS op0=7546896869197086323/>
; COMBINED-NEXT: <COMBINED
; CHECK: <TYPE_TEST_ASSUME_VCALLS op0=6699318081062747564 op1=16/>
define void @f1([3 x i8*]* %vtable) {
%vtablei8 = bitcast [3 x i8*]* %vtable to i8*
%p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"foo")
call void @llvm.assume(i1 %p)
%fptrptr = getelementptr [3 x i8*], [3 x i8*]* %vtable, i32 0, i32 2
%fptr = load i8*, i8** %fptrptr
%fptr_casted = bitcast i8* %fptr to void (i8*, i32)*
call void %fptr_casted(i8* null, i32 undef)
ret void
}
; CHECK: <TYPE_TEST_ASSUME_VCALLS op0=6699318081062747564 op1=24 op2=-2012135647395072713 op3=32/>
define void @f2([3 x i8*]* %vtable, [3 x i8*]* %vtable2) {
%vtablei8 = bitcast [3 x i8*]* %vtable to i8*
%p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"foo")
call void @llvm.assume(i1 %p)
%fptrptr = getelementptr [3 x i8*], [3 x i8*]* %vtable, i32 0, i32 3
%fptr = load i8*, i8** %fptrptr
%fptr_casted = bitcast i8* %fptr to void (i8*, i32)*
call void %fptr_casted(i8* null, i32 undef)
%vtablei82 = bitcast [3 x i8*]* %vtable2 to i8*
%p2 = call i1 @llvm.type.test(i8* %vtablei82, metadata !"bar")
call void @llvm.assume(i1 %p2)
%fptrptr2 = getelementptr [3 x i8*], [3 x i8*]* %vtable2, i32 0, i32 4
%fptr2 = load i8*, i8** %fptrptr2
%fptr_casted2 = bitcast i8* %fptr2 to void (i8*, i128)*
call void %fptr_casted2(i8* null, i128 0)
ret void
}
; CHECK: <TYPE_CHECKED_LOAD_VCALLS op0=6699318081062747564 op1=16/>
define void @f3(i8* %vtable) {
%pair = call {i8*, i1} @llvm.type.checked.load(i8* %vtable, i32 16, metadata !"foo")
%fptr = extractvalue {i8*, i1} %pair, 0
%fptr_casted = bitcast i8* %fptr to void (i8*, i32)*
call void %fptr_casted(i8* null, i32 undef)
ret void
}
; CHECK: <TYPE_TEST_ASSUME_CONST_VCALL op0=6699318081062747564 op1=16 op2=42/>
; CHECK-NEXT: <TYPE_TEST_ASSUME_CONST_VCALL op0=6699318081062747564 op1=24 op2=43/>
define void @f4([3 x i8*]* %vtable, [3 x i8*]* %vtable2) {
%vtablei8 = bitcast [3 x i8*]* %vtable to i8*
%p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"foo")
call void @llvm.assume(i1 %p)
%fptrptr = getelementptr [3 x i8*], [3 x i8*]* %vtable, i32 0, i32 2
%fptr = load i8*, i8** %fptrptr
%fptr_casted = bitcast i8* %fptr to void (i8*, i32)*
call void %fptr_casted(i8* null, i32 42)
%vtablei82 = bitcast [3 x i8*]* %vtable2 to i8*
%p2 = call i1 @llvm.type.test(i8* %vtablei82, metadata !"foo")
call void @llvm.assume(i1 %p2)
%fptrptr2 = getelementptr [3 x i8*], [3 x i8*]* %vtable2, i32 0, i32 3
%fptr2 = load i8*, i8** %fptrptr2
%fptr_casted2 = bitcast i8* %fptr2 to void (i8*, i32)*
call void %fptr_casted2(i8* null, i32 43)
ret void
}
; CHECK: <TYPE_CHECKED_LOAD_CONST_VCALL op0=6699318081062747564 op1=16 op2=42/>
define void @f5(i8* %vtable) {
%pair = call {i8*, i1} @llvm.type.checked.load(i8* %vtable, i32 16, metadata !"foo")
%fptr = extractvalue {i8*, i1} %pair, 0
%fptr_casted = bitcast i8* %fptr to void (i8*, i32)*
call void %fptr_casted(i8* null, i32 42)
ret void
}
; CHECK-NOT: <TYPE_CHECKED_LOAD_CONST_VCALL op0=7546896869197086323
; CHECK: <TYPE_TESTS op0=7546896869197086323/>
; CHECK-NOT: <TYPE_CHECKED_LOAD_CONST_VCALL op0=7546896869197086323
define {i8*, i1} @f6(i8* %vtable) {
%pair = call {i8*, i1} @llvm.type.checked.load(i8* %vtable, i32 16, metadata !"baz")
ret {i8*, i1} %pair
}
declare i1 @llvm.type.test(i8*, metadata) nounwind readnone
declare void @llvm.assume(i1)
declare {i8*, i1} @llvm.type.checked.load(i8*, i32, metadata)