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[X86] Remove -x86-experimental-pref-loop-alignment in favor of -align-loops

This commit is contained in:
Fangrui Song 2021-08-04 13:23:56 -07:00
parent 981ad13ac6
commit 9c19b36f1c
1 changed files with 2 additions and 10 deletions
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12
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -71,14 +71,6 @@ using namespace llvm;
STATISTIC(NumTailCalls, "Number of tail calls"); STATISTIC(NumTailCalls, "Number of tail calls");
static cl::opt<int> ExperimentalPrefLoopAlignment(
"x86-experimental-pref-loop-alignment", cl::init(4),
cl::desc(
"Sets the preferable loop alignment for experiments (as log2 bytes)"
"(the last x86-experimental-pref-loop-alignment bits"
" of the loop header PC will be 0)."),
cl::Hidden);
static cl::opt<int> ExperimentalPrefInnermostLoopAlignment( static cl::opt<int> ExperimentalPrefInnermostLoopAlignment(
"x86-experimental-pref-innermost-loop-alignment", cl::init(4), "x86-experimental-pref-innermost-loop-alignment", cl::init(4),
cl::desc( cl::desc(
@ -2070,8 +2062,8 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
MaxLoadsPerMemcmp = 2; MaxLoadsPerMemcmp = 2;
MaxLoadsPerMemcmpOptSize = 2; MaxLoadsPerMemcmpOptSize = 2;
// Set loop alignment to 2^ExperimentalPrefLoopAlignment bytes (default: 2^4). // Default loop alignment, which can be overridden by -align-loops.
setPrefLoopAlignment(Align(1ULL << ExperimentalPrefLoopAlignment)); setPrefLoopAlignment(Align(16));
// An out-of-order CPU can speculatively execute past a predictable branch, // An out-of-order CPU can speculatively execute past a predictable branch,
// but a conditional move could be stalled by an expensive earlier operation. // but a conditional move could be stalled by an expensive earlier operation.