3adc6e0308
As pointed out in https://discourse.llvm.org/t/undeterministic-thin-index-file/69985, the block count added to distributed ThinLTO index files breaks incremental builds on ThinLTO - if any linked file has a different number of BBs, then the accumulated sum placed in the index files will change, causing all ThinLTO backend compiles to be redone. The block count is only used for scaling of partial sample profiles, and was added in D80403 for D79831. This patch simply removes this field from the index files of non partial sample profile compiles, which is NFC on the output of the compiler. We subsequently need to see if this can be removed for partial sample profiles without signficant performance loss, or redesigned in a way that does not destroy caching. Differential Revision: https://reviews.llvm.org/D148746
30 lines
1.5 KiB
LLVM
30 lines
1.5 KiB
LLVM
; Tests that `llvm-dis` could disassemble ThinLTO minimized bitcode
|
|
; (e.g., bitcode generated by `opt --thin-link-bitcode-file=<minimized-bitcode>`,
|
|
; or `clang -Xclang -fthin-link-bitcode=<minimized-bitcode>`)
|
|
|
|
; %t.o is the thin-lto ready bitcode, and %t.thinlink.bc is the minimized bitcode.
|
|
; RUN: opt -thinlto-bc %s -thin-link-bitcode-file=%t.thinlink.bc -o %t.o
|
|
|
|
; With default options, `llvm-dis` returns invalid record for ThinLTO minimized bitcode.
|
|
; RUN: not llvm-dis %t.thinlink.bc 2>&1 | FileCheck %s --check-prefix=INVALID-RECORD
|
|
|
|
; INVALID-RECORD: Invalid record
|
|
|
|
; Tests that `llvm-dis` could disassemble minimized bitcode with `--print-thinlto-index-only`, and verify its content.
|
|
; RUN: llvm-dis --print-thinlto-index-only %t.thinlink.bc -o - | FileCheck %s --check-prefix=DIS
|
|
|
|
; Tests that `llvm-dis` could disassemble ThinLTO-ready bitcode with `--print-thinlto-index-only`,
|
|
; and verify its content.
|
|
; RUN: llvm-dis --print-thinlto-index-only %t.o -o - | FileCheck %s --check-prefix=DIS
|
|
|
|
; DIS: ^0 = module: (path: "{{.*}}thinlto-index-disassembled-by-llvm-dis.ll.tmp
|
|
; DIS: ^1 = gv: (name: "aplusb", summaries: (function: (module: ^0, flags: (linkage: external, visibility: default, notEligibleToImport: 0, live: 0, dsoLocal: 0, canAutoHide: 0), insts: 2))) ; guid =
|
|
|
|
source_filename = "add.cpp"
|
|
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
|
|
target triple = "x86_64-unknown-linux-gnu"
|
|
define i32 @aplusb(i32 %a, i32 %b) {
|
|
%add = add i32 %b, %a
|
|
ret i32 %add
|
|
}
|