On x86-64, for a varargs function, don't store the xmm registers to
the register save area if %al is 0. This avoids touching xmm
regsiters when they aren't actually used.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79061 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.h b/lib/Target/X86/X86ISelLowering.h
index 9e6cd81..3ac6e51 100644
--- a/lib/Target/X86/X86ISelLowering.h
+++ b/lib/Target/X86/X86ISelLowering.h
@@ -243,7 +243,12 @@
MUL_IMM,
// PTEST - Vector bitwise comparisons
- PTEST
+ PTEST,
+
+ // VASTART_SAVE_XMM_REGS - Save xmm argument registers to the stack,
+ // according to %al. An operator is needed so that this can be expanded
+ // with control flow.
+ VASTART_SAVE_XMM_REGS
};
}
@@ -715,6 +720,11 @@
MachineBasicBlock *BB,
unsigned cmovOpc) const;
+ /// Utility function to emit the xmm reg save portion of va_start.
+ MachineBasicBlock *EmitVAStartSaveXMMRegsWithCustomInserter(
+ MachineInstr *BInstr,
+ MachineBasicBlock *BB) const;
+
/// Emit nodes that will be selected as "test Op0,Op0", or something
/// equivalent, for use with the given x86 condition code.
SDValue EmitTest(SDValue Op0, unsigned X86CC, SelectionDAG &DAG);