[llvm] r178965 - SPARC v9 stack pointer bias.

[Jakob Stoklund Olesen]

Author: stoklund
Date: Sat Apr  6 16:38:57 2013
New Revision: 178965

URL: http://llvm.org/viewvc/llvm-project?rev=178965&view=rev
Log:
SPARC v9 stack pointer bias.

64-bit SPARC v9 processes use biased stack and frame pointers, so the
current function's stack frame is located at %sp+BIAS .. %fp+BIAS where
BIAS = 2047.

This makes more local variables directly accessible via [%fp+simm13]
addressing.

Modified:
    llvm/trunk/lib/Target/Sparc/SparcRegisterInfo.cpp
    llvm/trunk/lib/Target/Sparc/SparcSubtarget.h
    llvm/trunk/test/CodeGen/SPARC/64abi.ll

Modified: llvm/trunk/lib/Target/Sparc/SparcRegisterInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Sparc/SparcRegisterInfo.cpp?rev=178965&r1=178964&r2=178965&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Sparc/SparcRegisterInfo.cpp (original)
+++ llvm/trunk/lib/Target/Sparc/SparcRegisterInfo.cpp Sat Apr  6 16:38:57 2013
@@ -74,8 +74,9 @@ SparcRegisterInfo::eliminateFrameIndex(M
 
   // Addressable stack objects are accessed using neg. offsets from %fp
   MachineFunction &MF = *MI.getParent()->getParent();
-  int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
-               MI.getOperand(FIOperandNum + 1).getImm();
+  int64_t Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
+                   MI.getOperand(FIOperandNum + 1).getImm() +
+                   Subtarget.getStackPointerBias();
 
   // Replace frame index with a frame pointer reference.
   if (Offset >= -4096 && Offset <= 4095) {

Modified: llvm/trunk/lib/Target/Sparc/SparcSubtarget.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Sparc/SparcSubtarget.h?rev=178965&r1=178964&r2=178965&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Sparc/SparcSubtarget.h (original)
+++ llvm/trunk/lib/Target/Sparc/SparcSubtarget.h Sat Apr  6 16:38:57 2013
@@ -52,6 +52,12 @@ public:
     }
     return std::string(p);
   }
+
+  /// The 64-bit ABI uses biased stack and frame pointers, so the stack frame
+  /// of the current function is the area from [%sp+BIAS] to [%fp+BIAS].
+  int64_t getStackPointerBias() const {
+    return is64Bit() ? 2047 : 0;
+  }
 };
 
 } // end namespace llvm

Modified: llvm/trunk/test/CodeGen/SPARC/64abi.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/SPARC/64abi.ll?rev=178965&r1=178964&r2=178965&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/SPARC/64abi.ll (original)
+++ llvm/trunk/test/CodeGen/SPARC/64abi.ll Sat Apr  6 16:38:57 2013
@@ -7,10 +7,9 @@
 ; CHECK: st  %i3, [%i4]
 ; CHECK: stx %i4, [%i4]
 ; CHECK: st  %i5, [%i4]
-; FIXME: Stack bias
-; CHECK: ld [%fp+180], [[R:%[gilo][0-7]]]
+; CHECK: ld [%fp+2227], [[R:%[gilo][0-7]]]
 ; CHECK: st  [[R]], [%i4]
-; CHECK: ldx [%fp+184], [[R:%[gilo][0-7]]]
+; CHECK: ldx [%fp+2231], [[R:%[gilo][0-7]]]
 ; CHECK: stx [[R]], [%i4]
 define void @intarg(i8  %a0,   ; %i0
                     i8  %a1,   ; %i1
@@ -39,8 +38,7 @@ define void @intarg(i8  %a0,   ; %i0
 ; CHECK: faddd %f2,
 ; CHECK: faddd %f4,
 ; CHECK: faddd %f6,
-; FIXME: Stack bias
-; CHECK: ld [%fp+260], [[F:%f[0-9]+]]
+; CHECK: ld [%fp+2307], [[F:%f[0-9]+]]
 ; CHECK: fadds %f31, [[F]]
 define double @floatarg(float %a0,    ; %f1
                         double %a1,   ; %d2
@@ -74,8 +72,8 @@ define double @floatarg(float %a0,    ;
 ; CHECK: fstod %f3
 ; CHECK: faddd %f6
 ; CHECK: faddd %f16
-; CHECK: ldx [%fp+184]
-; CHECK: ldx [%fp+200]
+; CHECK: ldx [%fp+2231]
+; CHECK: ldx [%fp+2247]
 define void @mixedarg(i8 %a0,      ; %i0
                       float %a1,   ; %f3
                       i16 %a2,     ; %i2