ppc linux: add comment about xmm registers

2019-07-10 14:55:30 -04:00 · 2019-07-10 14:55:30 -04:00 · 0cf34743cc
parent 02dd9254b1
commit 0cf34743cc
1 changed files with 1 additions and 0 deletions
--- a/src/xenia/cpu/backend/x64/x64_backend.cc
+++ b/src/xenia/cpu/backend/x64/x64_backend.cc
@ -657,6 +657,7 @@ void X64ThunkEmitter::EmitLoadVolatileRegs() {

 void X64ThunkEmitter::EmitSaveNonvolatileRegs() {
 #if XE_PLATFORM_LINUX
+  // SysV does not have nonvolatile XMM registers.
  mov(qword[rsp + offsetof(StackLayout::Thunk, r[0])], rbx);
  mov(qword[rsp + offsetof(StackLayout::Thunk, r[1])], rbp);
  mov(qword[rsp + offsetof(StackLayout::Thunk, r[2])], r12);