Increase ARM APCS preferred alignment for i64 and f64 from 32 bits to 64 bits.
authorBob Wilson <bob.wilson@apple.com>
Wed, 29 Sep 2010 17:54:10 +0000 (17:54 +0000)
committerBob Wilson <bob.wilson@apple.com>
Wed, 29 Sep 2010 17:54:10 +0000 (17:54 +0000)
LDM/STM instructions can run one cycle faster on some ARM processors if the
memory address is 64-bit aligned.  Radar 8489376.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115047 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMLoadStoreOptimizer.cpp
lib/Target/ARM/ARMSubtarget.h
test/CodeGen/ARM/align.ll

index ec2b74ac0f3e8cd62a75bc618c1005471f8f9521..a7d1d9f3fbd34319e9cdd9c20aea9704bd14ba2f 100644 (file)
@@ -1370,7 +1370,7 @@ ARMPreAllocLoadStoreOpt::CanFormLdStDWord(MachineInstr *Op0, MachineInstr *Op1,
   unsigned Align = (*Op0->memoperands_begin())->getAlignment();
   const Function *Func = MF->getFunction();
   unsigned ReqAlign = STI->hasV6Ops()
-    ? TD->getPrefTypeAlignment(Type::getInt64Ty(Func->getContext())) 
+    ? TD->getABITypeAlignment(Type::getInt64Ty(Func->getContext())) 
     : 8;  // Pre-v6 need 8-byte align
   if (Align < ReqAlign)
     return false;
index aefd130b9a8cc1fb98fadfc0f290c686e8d1dffe..1188c6dedd951c1da20ab0de3aae86b51687a509 100644 (file)
@@ -218,7 +218,7 @@ protected:
   std::string getDataLayout() const {
     if (isThumb()) {
       if (isAPCS_ABI()) {
-        return std::string("e-p:32:32-f64:32:32-i64:32:32-"
+        return std::string("e-p:32:32-f64:32:64-i64:32:64-"
                            "i16:16:32-i8:8:32-i1:8:32-"
                            "v128:32:128-v64:32:64-a:0:32-n32");
       } else {
@@ -228,7 +228,7 @@ protected:
       }
     } else {
       if (isAPCS_ABI()) {
-        return std::string("e-p:32:32-f64:32:32-i64:32:32-"
+        return std::string("e-p:32:32-f64:32:64-i64:32:64-"
                            "v128:32:128-v64:32:64-n32");
       } else {
         return std::string("e-p:32:32-f64:64:64-i64:64:64-"
index d4d01288f29bf0e256163e8ca1679c8bcbc85a2b..d57c159b85cb3c6665e1a150331a9469c49285e9 100644 (file)
@@ -22,7 +22,7 @@
 @e = global i64 4
 ;ELF: .align 3
 ;ELF: e
-;DARWIN: .align 2
+;DARWIN: .align 3
 ;DARWIN: _e:
 
 @f = global float 5.0
@@ -34,7 +34,7 @@
 @g = global double 6.0
 ;ELF: .align 3
 ;ELF: g:
-;DARWIN: .align 2
+;DARWIN: .align 3
 ;DARWIN: _g:
 
 @bar = common global [75 x i8] zeroinitializer, align 128