ARM: follow up improvements for SVN r263118

The initial change was insufficiently complete for always getting the semantics
of __builtin_longjmp correct.  The builtin is translated into a
`tInt_eh_sjlj_longjmp` DAG node.  This node set R7 as clobbered.  However, the
code would then follow up with a clobber of R11.  I had failed to notice the
imp-def,kill on R7 in the isel.  Unfortunately, it seems that it is not possible
to conditionalise the Defs list via an !if.  Instead, construct a new parallel
WIN node and prefer that when targeting windows.  This ensures that we now both
correctly model the __builtin_longjmp as well as construct the frame in a more
ABI conformant manner.

llvm-svn: 263123

4 files changed, 14 insertions, 4 deletions

diff --git a/llvm/lib/Target/ARM/ARMAsmPrinter.cpp b/llvm/lib/Target/ARM/ARMAsmPrinter.cpp
index 2629da9570f..8b011d60964 100644
--- a/llvm/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/llvm/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -1852,13 +1852,13 @@ void ARMAsmPrinter::EmitInstruction(const MachineInstr *MI) {
       .addReg(0));
     return;
   }
-  case ARM::tInt_eh_sjlj_longjmp: {
+  case ARM::tInt_eh_sjlj_longjmp:
+  case ARM::tInt_WIN_eh_sjlj_longjmp: {
     // ldr $scratch, [$src, #8]
     // mov sp, $scratch
     // ldr $scratch, [$src, #4]
     // ldr r7, [$src]
     // bx $scratch
-    const Triple &TT = TM.getTargetTriple();
     unsigned SrcReg = MI->getOperand(0).getReg();
     unsigned ScratchReg = MI->getOperand(1).getReg();
 
@@ -1888,7 +1888,7 @@ void ARMAsmPrinter::EmitInstruction(const MachineInstr *MI) {
       .addReg(0));
 
     EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tLDRi)
-      .addReg(TT.isOSWindows() ? ARM::R11 : ARM::R7)
+      .addReg(Opc == ARM::tInt_WIN_eh_sjlj_longjmp ? ARM::R11 : ARM::R7)
       .addReg(SrcReg)
       .addImm(0)
       // Predicate.
diff --git a/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp b/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
index 9fabcd2f8f9..de4ae4f425b 100644
--- a/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
@@ -632,6 +632,7 @@ unsigned ARMBaseInstrInfo::GetInstSizeInBytes(const MachineInstr *MI) const {
   case ARM::Int_eh_sjlj_longjmp:
     return 16;
   case ARM::tInt_eh_sjlj_longjmp:
+  case ARM::tInt_WIN_eh_sjlj_longjmp:
     return 10;
   case ARM::Int_eh_sjlj_setjmp:
   case ARM::Int_eh_sjlj_setjmp_nofp:
diff --git a/llvm/lib/Target/ARM/ARMInstrInfo.td b/llvm/lib/Target/ARM/ARMInstrInfo.td
index fcb40192441..c0d236c83b7 100644
--- a/llvm/lib/Target/ARM/ARMInstrInfo.td
+++ b/llvm/lib/Target/ARM/ARMInstrInfo.td
@@ -294,6 +294,8 @@ def IsARM            : Predicate<"!Subtarget->isThumb()">,
 def IsMachO          : Predicate<"Subtarget->isTargetMachO()">;
 def IsNotMachO       : Predicate<"!Subtarget->isTargetMachO()">;
 def IsNaCl           : Predicate<"Subtarget->isTargetNaCl()">;
+def IsWindows        : Predicate<"Subtarget->isTargetWindows()">;
+def IsNotWindows     : Predicate<"!Subtarget->isTargetWindows()">;
 def UseNaClTrap      : Predicate<"Subtarget->useNaClTrap()">,
                                  AssemblerPredicate<"FeatureNaClTrap", "NaCl">;
 def DontUseNaClTrap  : Predicate<"!Subtarget->useNaClTrap()">;
diff --git a/llvm/lib/Target/ARM/ARMInstrThumb.td b/llvm/lib/Target/ARM/ARMInstrThumb.td
index 307eeed3fb3..aee4a5db70f 100644
--- a/llvm/lib/Target/ARM/ARMInstrThumb.td
+++ b/llvm/lib/Target/ARM/ARMInstrThumb.td
@@ -1329,7 +1329,14 @@ def tInt_eh_sjlj_longjmp : XI<(outs), (ins GPR:$src, GPR:$scratch),
                               AddrModeNone, 0, IndexModeNone,
                               Pseudo, NoItinerary, "", "",
                               [(ARMeh_sjlj_longjmp GPR:$src, GPR:$scratch)]>,
-                             Requires<[IsThumb]>;
+                             Requires<[IsThumb,IsNotWindows]>;
+
+let isBarrier = 1, hasSideEffects = 1, isTerminator = 1, isCodeGenOnly = 1,
+    Defs = [ R11, LR, SP ] in
+def tInt_WIN_eh_sjlj_longjmp
+  : XI<(outs), (ins GPR:$src, GPR:$scratch), AddrModeNone, 0, IndexModeNone,
+       Pseudo, NoItinerary, "", "", [(ARMeh_sjlj_longjmp GPR:$src, GPR:$scratch)]>,
+    Requires<[IsThumb,IsWindows]>;
 
 //===----------------------------------------------------------------------===//
 // Non-Instruction Patterns