From 5fae9ccd399e6fc7fc94d89a1adda517c12ed64b Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sun, 15 May 2005 05:49:58 +0000
Subject: [PATCH] Teach reginfo how to deal with ADJSTACKPTRri, allowing us to
 generate:         add %ESP, 20         jmp %EDX  # TAIL CALL

instead of:
        add %ESP, -8
        add %ESP, 28
        jmp %EDX  # TAIL CALL


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22047 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86RegisterInfo.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp
index a1ec6dcbe49..08920cc2605 100644
--- a/lib/Target/X86/X86RegisterInfo.cpp
+++ b/lib/Target/X86/X86RegisterInfo.cpp
@@ -544,6 +544,9 @@ void X86RegisterInfo::emitEpilogue(MachineFunction &MF,
                    PI->getOperand(0).getReg() == X86::ESP) {
           NumBytes -= PI->getOperand(1).getImmedValue();
           MBB.erase(PI);
+        } else if (PI->getOpcode() == X86::ADJSTACKPTRri) {
+          NumBytes += PI->getOperand(1).getImmedValue();
+          MBB.erase(PI);
         }
       }