[X86][AVX512] Use the proper load/store for AVX512 registers.

When loading or storing AVX512 registers we were not using the AVX512
variant of the load and store for VR128 and VR256 like registers.
Thus, we ended up with the wrong encoding and actually were dropping the
high bits of the instruction. The result was that we load or store the
wrong register. The effect is visible only when we emit the object file
directly and disassemble it. Then, the output of the disassembler does
not match the assembly input.

This is related to llvm.org/PR27481.

llvm-svn: 269001

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/Target/X86/X86RegisterInfo.cpp b/llvm/lib/Target/X86/X86RegisterInfo.cpp
index cb4170cc623..7b1059ee32d 100644
--- a/llvm/lib/Target/X86/X86RegisterInfo.cpp
+++ b/llvm/lib/Target/X86/X86RegisterInfo.cpp
@@ -294,10 +294,11 @@ X86RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
     return CSR_64_SaveList;
   case CallingConv::X86_INTR:
     if (Is64Bit) {
+      if (HasAVX512)
+        return CSR_64_AllRegs_AVX512_SaveList;
       if (HasAVX)
         return CSR_64_AllRegs_AVX_SaveList;
-      else
-        return CSR_64_AllRegs_SaveList;
+      return CSR_64_AllRegs_SaveList;
     } else {
       if (HasSSE)
         return CSR_32_AllRegs_SSE_SaveList;