diff options
| author | Dimitry Andric <dim@FreeBSD.org> | 2020-07-26 19:36:28 +0000 |
|---|---|---|
| committer | Dimitry Andric <dim@FreeBSD.org> | 2020-07-26 19:36:28 +0000 |
| commit | cfca06d7963fa0909f90483b42a6d7d194d01e08 (patch) | |
| tree | 209fb2a2d68f8f277793fc8df46c753d31bc853b /llvm/lib/Target/X86/X86VZeroUpper.cpp | |
| parent | 706b4fc47bbc608932d3b491ae19a3b9cde9497b (diff) | |
Notes
Diffstat (limited to 'llvm/lib/Target/X86/X86VZeroUpper.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86VZeroUpper.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
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<bool> +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<X86Subtarget>(); if (!ST.hasAVX() || !ST.insertVZEROUPPER()) return false; |