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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178965 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/Sparc/SparcRegisterInfo.cpp b/lib/Target/Sparc/SparcRegisterInfo.cpp
index db9b30eb4330c557840e7aba384295ebde530def..3af4c614cd445da87c6c3d70ed20822bedb86b25 100644 (file)
--- a/lib/Target/Sparc/SparcRegisterInfo.cpp
+++ b/lib/Target/Sparc/SparcRegisterInfo.cpp
@@ -74,8 +74,9 @@ SparcRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
 
   // 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) {

diff --git a/lib/Target/Sparc/SparcSubtarget.h b/lib/Target/Sparc/SparcSubtarget.h
index a81931b34aa241e9b955f891be37949ac0853765..b94dd110ea9f57dd52446ea69591c07e9ffcff7e 100644 (file)
--- a/lib/Target/Sparc/SparcSubtarget.h
+++ b/lib/Target/Sparc/SparcSubtarget.h
@@ -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

diff --git a/test/CodeGen/SPARC/64abi.ll b/test/CodeGen/SPARC/64abi.ll
index a9eb62387b52be2bb1dc4d7a971b64779adfcd09..5c1c27aebc48039a56669f01d213471b97070be1 100644 (file)
--- a/test/CodeGen/SPARC/64abi.ll
+++ b/test/CodeGen/SPARC/64abi.ll
@@ -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,    ; %f1
 ; 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