bd4b1b5f6d
The current IRSimilarityIdentifier does not try to find similarity across blocks, this patch provides a mechanism to compare two branches against one another, to find similarity across basic blocks, rather than just within them. This adds a step in the similarity identification process that labels all of the basic blocks so that we can identify the relative branching locations. Within an IRSimilarityCandidate we use these relative locations to determine whether if the branching to other relative locations in the same region is the same between branches. If they are, we consider them similar. We do not consider the relative location of the branch if the target branch is outside of the region. In this case, both branches must exit to a location outside the region, but the exact relative location does not matter. Reviewers: paquette, yroux Differential Revision: https://reviews.llvm.org/D106989
71 lines
2.5 KiB
LLVM
71 lines
2.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -verify -iroutliner -no-ir-sim-branch-matching -ir-outlining-no-cost < %s | FileCheck %s
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; This test checks that catchpad instructions are not outlined even if they
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; in a similar section. Dealing with exception handling inside of an outlined
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; function would require a lot of handling that is not implemented yet.
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declare void @llvm.donothing() nounwind readnone
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define void @function1() personality i8 3 {
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; CHECK-LABEL: @function1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[A:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[B:%.*]] = alloca i32, align 4
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; CHECK-NEXT: invoke void @llvm.donothing()
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; CHECK-NEXT: to label [[NORMAL:%.*]] unwind label [[EXCEPTION:%.*]]
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; CHECK: exception:
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; CHECK-NEXT: [[CS1:%.*]] = catchswitch within none [label %catchpad1] unwind to caller
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; CHECK: catchpad1:
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; CHECK-NEXT: [[TMP0:%.*]] = catchpad within [[CS1]] []
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; CHECK-NEXT: call void @outlined_ir_func_0(i32* [[A]], i32* [[B]])
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; CHECK-NEXT: br label [[NORMAL]]
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; CHECK: normal:
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; CHECK-NEXT: ret void
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;
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entry:
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%a = alloca i32, align 4
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%b = alloca i32, align 4
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invoke void @llvm.donothing() to label %normal unwind label %exception
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exception:
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%cs1 = catchswitch within none [label %catchpad1] unwind to caller
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catchpad1:
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catchpad within %cs1 []
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store i32 2, i32* %a, align 4
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store i32 3, i32* %b, align 4
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br label %normal
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normal:
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ret void
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}
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define void @function2() personality i8 3 {
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; CHECK-LABEL: @function2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[A:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[B:%.*]] = alloca i32, align 4
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; CHECK-NEXT: invoke void @llvm.donothing()
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; CHECK-NEXT: to label [[NORMAL:%.*]] unwind label [[EXCEPTION:%.*]]
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; CHECK: exception:
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; CHECK-NEXT: [[CS1:%.*]] = catchswitch within none [label %catchpad1] unwind to caller
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; CHECK: catchpad1:
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; CHECK-NEXT: [[TMP0:%.*]] = catchpad within [[CS1]] []
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; CHECK-NEXT: call void @outlined_ir_func_0(i32* [[A]], i32* [[B]])
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; CHECK-NEXT: br label [[NORMAL]]
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; CHECK: normal:
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; CHECK-NEXT: ret void
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;
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entry:
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%a = alloca i32, align 4
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%b = alloca i32, align 4
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invoke void @llvm.donothing() to label %normal unwind label %exception
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exception:
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%cs1 = catchswitch within none [label %catchpad1] unwind to caller
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catchpad1:
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catchpad within %cs1 []
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store i32 2, i32* %a, align 4
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store i32 3, i32* %b, align 4
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br label %normal
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normal:
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ret void
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}
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