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[ThinLTO] Always import constants

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This patch imports constant variables even when they can't be internalized
(which results in promotion). This offers some extra constant folding
opportunities.

Differential revision: https://reviews.llvm.org/D70404
This commit is contained in:
evgeny
2020-01-15 19:29:01 +03:00
parent 3f3017e162
commit 10cadee5ce
19 changed files with 187 additions and 35 deletions
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9
llvm/lib/Bitcode/Reader/BitcodeReader.cpp
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@@ -986,7 +986,8 @@ static GlobalValueSummary::GVFlags getDecodedGVSummaryFlags(uint64_t RawFlags,
// Decode the flags for GlobalVariable in the summary
static GlobalVarSummary::GVarFlags getDecodedGVarFlags(uint64_t RawFlags) {
return GlobalVarSummary::GVarFlags((RawFlags & 0x1) ? true : false,
(RawFlags & 0x2) ? true : false);
(RawFlags & 0x2) ? true : false,
(RawFlags & 0x4) ? true : false);
}
static GlobalValue::VisibilityTypes getDecodedVisibility(unsigned Val) {
@@ -5965,7 +5966,8 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
uint64_t RawFlags = Record[1];
unsigned RefArrayStart = 2;
GlobalVarSummary::GVarFlags GVF(/* ReadOnly */ false,
/* WriteOnly */ false);
/* WriteOnly */ false,
/* Constant */ false);
auto Flags = getDecodedGVSummaryFlags(RawFlags, Version);
if (Version >= 5) {
GVF = getDecodedGVarFlags(Record[2]);
@@ -6101,7 +6103,8 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
uint64_t RawFlags = Record[2];
unsigned RefArrayStart = 3;
GlobalVarSummary::GVarFlags GVF(/* ReadOnly */ false,
/* WriteOnly */ false);
/* WriteOnly */ false,
/* Constant */ false);
auto Flags = getDecodedGVSummaryFlags(RawFlags, Version);
if (Version >= 5) {
GVF = getDecodedGVarFlags(Record[3]);