commit 3ee306cbc0a295409c464ffaad5ef694de8eb09a
author Akira Hatanaka <ahatanaka@mips.com> Mon Jul 23 23:45:54 2012 +0000
committer Akira Hatanaka <ahatanaka@mips.com> Mon Jul 23 23:45:54 2012 +0000
tree 0f0cb3e4eac9c89a2931eeb2bfc7e6c8a5615e1a
parent 581a739226381450ea2271cc794618043b6aeb4a

Add basic ability to setup call frame, and make procedure calls.
Hello world will compile and execute with this patch.

Patch by Reed Kotler.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160651 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/MipsFrameLowering.cpp

diff --git a/lib/Target/Mips/MipsFrameLowering.cpp b/lib/Target/Mips/MipsFrameLowering.cpp
index cb55995..6338f3c 100644
--- a/lib/Target/Mips/MipsFrameLowering.cpp
+++ b/lib/Target/Mips/MipsFrameLowering.cpp
@@ -114,7 +114,7 @@
   unsigned StackAlign = getStackAlignment();
   uint64_t StackSize = RoundUpToAlignment(MFI->getStackSize(), StackAlign);
 
-  if (MipsFI->globalBaseRegSet()) 
+  if (MipsFI->globalBaseRegSet())
     StackSize += MFI->getObjectOffset(MipsFI->getGlobalRegFI()) + StackAlign;
   else
     StackSize += RoundUpToAlignment(MipsFI->getMaxCallFrameSize(), StackAlign);
@@ -130,8 +130,13 @@
   MachineLocation DstML, SrcML;
 
   // Adjust stack.
-  if (isInt<16>(-StackSize)) // addi sp, sp, (-stacksize)
-    BuildMI(MBB, MBBI, dl, TII.get(ADDiu), SP).addReg(SP).addImm(-StackSize);
+  if (isInt<16>(-StackSize)) {// addi sp, sp, (-stacksize)
+    if (STI.inMips16Mode())
+      BuildMI(MBB, MBBI, dl,
+              TII.get(Mips::SaveRaF16)).addImm(StackSize); // cleanup
+    else
+      BuildMI(MBB, MBBI, dl, TII.get(ADDiu), SP).addReg(SP).addImm(-StackSize);
+  }
   else { // Expand immediate that doesn't fit in 16-bit.
     unsigned ATReg = STI.isABI_N64() ? Mips::AT_64 : Mips::AT;
 
@@ -237,8 +242,14 @@
     return;
 
   // Adjust stack.
-  if (isInt<16>(StackSize)) // addi sp, sp, (-stacksize)
-    BuildMI(MBB, MBBI, dl, TII.get(ADDiu), SP).addReg(SP).addImm(StackSize);
+  if (isInt<16>(StackSize)) { // addi sp, sp, (-stacksize)
+    if (STI.inMips16Mode())
+      // assumes stacksize multiple of 8
+      BuildMI(MBB, MBBI, dl,
+              TII.get(Mips::RestoreRaF16)).addImm(StackSize);
+    else
+      BuildMI(MBB, MBBI, dl, TII.get(ADDiu), SP).addReg(SP).addImm(StackSize);
+  }
   else { // Expand immediate that doesn't fit in 16-bit.
     unsigned ATReg = STI.isABI_N64() ? Mips::AT_64 : Mips::AT;