From cfca06d7963fa0909f90483b42a6d7d194d01e08 Mon Sep 17 00:00:00 2001 From: Dimitry Andric Date: Sun, 26 Jul 2020 19:36:28 +0000 Subject: Vendor import of llvm-project master 2e10b7a39b9, the last commit before the llvmorg-12-init tag, from which release/11.x was branched. --- llvm/lib/Target/X86/X86VZeroUpper.cpp | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'llvm/lib/Target/X86/X86VZeroUpper.cpp') diff --git a/llvm/lib/Target/X86/X86VZeroUpper.cpp b/llvm/lib/Target/X86/X86VZeroUpper.cpp index 7a8308ef1ba94..c188c74436254 100644 --- a/llvm/lib/Target/X86/X86VZeroUpper.cpp +++ b/llvm/lib/Target/X86/X86VZeroUpper.cpp @@ -39,6 +39,11 @@ using namespace llvm; #define DEBUG_TYPE "x86-vzeroupper" +static cl::opt +UseVZeroUpper("x86-use-vzeroupper", cl::Hidden, + cl::desc("Minimize AVX to SSE transition penalty"), + cl::init(true)); + STATISTIC(NumVZU, "Number of vzeroupper instructions inserted"); namespace { @@ -278,6 +283,9 @@ void VZeroUpperInserter::processBasicBlock(MachineBasicBlock &MBB) { /// Loop over all of the basic blocks, inserting vzeroupper instructions before /// function calls. bool VZeroUpperInserter::runOnMachineFunction(MachineFunction &MF) { + if (!UseVZeroUpper) + return false; + const X86Subtarget &ST = MF.getSubtarget(); if (!ST.hasAVX() || !ST.insertVZEROUPPER()) return false; -- cgit v1.2.3