[llvm-commits] [llvm] r161778 - in /llvm/trunk: lib/Target/Hexagon/HexagonInstrInfo.td test/CodeGen/Hexagon/simpletailcall.ll

[Arnold Schwaighofer]

Author: arnolds
Date: Mon Aug 13 14:54:01 2012
New Revision: 161778

URL: http://llvm.org/viewvc/llvm-project?rev=161778&view=rev
Log:
[Hexagon] Don't mark callee saved registers as clobbered by a tail call

This was causing unnecessary spills/restores of callee saved registers.

Fixes PR13572.

Patch by Pranav Bhandarkar!


Added:
    llvm/trunk/test/CodeGen/Hexagon/simpletailcall.ll
Modified:
    llvm/trunk/lib/Target/Hexagon/HexagonInstrInfo.td

Modified: llvm/trunk/lib/Target/Hexagon/HexagonInstrInfo.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Hexagon/HexagonInstrInfo.td?rev=161778&r1=161777&r2=161778&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Hexagon/HexagonInstrInfo.td (original)
+++ llvm/trunk/lib/Target/Hexagon/HexagonInstrInfo.td Mon Aug 13 14:54:01 2012
@@ -2580,22 +2580,16 @@
  }
 
 // Tail Calls.
-let isCall = 1, isBarrier = 1, isReturn = 1, isTerminator = 1,
-  Defs = [D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D10,
-          R22, R23, R28, R31, P0, P1, P2, P3, LC0, LC1, SA0, SA1] in {
+let isCall = 1, isBarrier = 1, isReturn = 1, isTerminator = 1 in {
   def TCRETURNtg : JInst<(outs), (ins calltarget:$dst),
              "jump $dst // TAILCALL", []>;
 }
-let isCall = 1, isBarrier = 1, isReturn = 1, isTerminator = 1,
-  Defs = [D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D10,
-          R22, R23, R28, R31, P0, P1, P2, P3, LC0, LC1, SA0, SA1] in {
+let isCall = 1, isBarrier = 1, isReturn = 1, isTerminator = 1 in {
   def TCRETURNtext : JInst<(outs), (ins calltarget:$dst),
              "jump $dst // TAILCALL", []>;
 }
 
-let isCall = 1, isBarrier = 1, isReturn = 1, isTerminator = 1,
-  Defs = [D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D10,
-          R22, R23, R28, R31, P0, P1, P2, P3, LC0, LC1, SA0, SA1] in {
+let isCall = 1, isBarrier = 1, isReturn = 1, isTerminator = 1 in {
   def TCRETURNR : JInst<(outs), (ins IntRegs:$dst),
              "jumpr $dst // TAILCALL", []>;
 }

Added: llvm/trunk/test/CodeGen/Hexagon/simpletailcall.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/Hexagon/simpletailcall.ll?rev=161778&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/Hexagon/simpletailcall.ll (added)
+++ llvm/trunk/test/CodeGen/Hexagon/simpletailcall.ll Mon Aug 13 14:54:01 2012
@@ -0,0 +1,14 @@
+; RUN: llc -march=hexagon -mcpu=hexagonv4 < %s | FileCheck %s
+; CHECK: foo_empty
+; CHECK-NOT: allocframe
+; CHECK-NOT: memd(r29
+; CHECK: jump bar_empty
+
+define void @foo_empty(i32 %h) nounwind {
+entry:
+  %add = add nsw i32 %h, 3
+  %call = tail call i32 bitcast (i32 (...)* @bar_empty to i32 (i32)*)(i32 %add) nounwind
+  ret void
+}
+
+declare i32 @bar_empty(...)