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e2f34269f3
Summary: To enable profile-guided indirect call promotion in ThinLTO mode, we simply add call graph edges for each profitable target from the profile to the summaries, then the summary-guided importing will consider the callee for importing as usual. Also we need to enable the indirect call promotion pass creation in the PassManagerBuilder when PerformThinLTO=true (we are in the ThinLTO backend), so that the newly imported functions are considered for promotion in the backends. The IC promotion profiles refer to callees by GUID, which required adding GUIDs to the per-module VST in bitcode (and assigning them valueIds similar to how they are assigned valueIds in the combined index). Reviewers: mehdi_amini, xur Subscribers: mehdi_amini, davidxl, llvm-commits Differential Revision: http://reviews.llvm.org/D21932 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@275707 91177308-0d34-0410-b5e6-96231b3b80d8
33 lines
1.4 KiB
LLVM
33 lines
1.4 KiB
LLVM
; Do setup work for all below tests: generate bitcode and combined index
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; RUN: opt -module-summary %s -o %t.bc
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; RUN: opt -module-summary %p/Inputs/thinlto_indirect_call_promotion.ll -o %t2.bc
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; RUN: llvm-lto -thinlto -o %t3 %t.bc %t2.bc
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; RUN: opt -function-import -summary-file %t3.thinlto.bc %t.bc -o %t4.bc -print-imports 2>&1 | FileCheck %s --check-prefix=IMPORTS
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; IMPORTS: Import a
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; RUN: opt %t4.bc -pgo-icall-prom -S -icp-count-threshold=1 | FileCheck %s --check-prefix=ICALL-PROM
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; RUN: opt %t4.bc -pgo-icall-prom -S -pass-remarks=pgo-icall-prom -icp-count-threshold=1 2>&1 | FileCheck %s --check-prefix=PASS-REMARK
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; PASS-REMARK: Promote indirect call to a with count 1 out of 1
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@foo = external local_unnamed_addr global void ()*, align 8
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define i32 @main() local_unnamed_addr {
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entry:
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%0 = load void ()*, void ()** @foo, align 8
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; ICALL-PROM: br i1 %{{[0-9]+}}, label %if.true.direct_targ, label %if.false.orig_indirect, !prof [[BRANCH_WEIGHT:![0-9]+]]
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tail call void %0(), !prof !1
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ret i32 0
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}
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!1 = !{!"VP", i32 0, i64 1, i64 -6289574019528802036, i64 1}
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; Should not have a VP annotation on new indirect call (check before and after
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; branch_weights annotation).
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; ICALL-PROM-NOT: !"VP"
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; ICALL-PROM: [[BRANCH_WEIGHT]] = !{!"branch_weights", i32 1, i32 0}
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; ICALL-PROM-NOT: !"VP"
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