From: Matthias Braun <matze@braunis.de>
Date: Fri, 17 Jul 2015 23:18:26 +0000 (+0000)
Subject: ARM: Add scheduling information for LDRLIT instructions to swift scheduling model
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0dec0e1ea5a7df2aca129fdbe8fb1db87938c593;p=oota-llvm.git

ARM: Add scheduling information for LDRLIT instructions to swift scheduling model

These pseudo instructions are only lowered after register allocation and
are therefore still present when the machine scheduler runs.
Add a run: line to a testcase that uses the uncommon flags necessary to
actually produce a LDRLIT instruction on swift.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242587 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/ARMScheduleSwift.td b/lib/Target/ARM/ARMScheduleSwift.td
index b03d5ff44c6..ff82ca41908 100644
--- a/lib/Target/ARM/ARMScheduleSwift.td
+++ b/lib/Target/ARM/ARMScheduleSwift.td
@@ -1558,6 +1558,13 @@ let SchedModel = SwiftModel in {
         (instregex "STM(IB|IA|DB|DA)_UPD", "(t2|sys|t)STM(IB|IA|DB|DA)_UPD",
         "PUSH", "tPUSH")>;
 
+  // LDRLIT pseudo instructions, they expand to LDR + PICADD
+  def : InstRW<[SwiftWriteP2ThreeCycle, WriteALU],
+        (instregex "t?LDRLIT_ga_abs", "t?LDRLIT_ga_pcrel")>;
+  // LDRLIT_ga_pcrel_ldr expands to LDR + PICLDR
+  def : InstRW<[SwiftWriteP2ThreeCycle, SwiftWriteP2ThreeCycle],
+        (instregex "LDRLIT_ga_pcrel_ldr")>;
+
   // 4.2.26 Branch
   def : WriteRes<WriteBr, [SwiftUnitP1]> { let Latency = 0; }
   def : WriteRes<WriteBrL, [SwiftUnitP1]> { let Latency = 2; }
diff --git a/test/CodeGen/Thumb2/pic-load.ll b/test/CodeGen/Thumb2/pic-load.ll
index 53d456c5345..cfdad03dcd5 100644
--- a/test/CodeGen/Thumb2/pic-load.ll
+++ b/test/CodeGen/Thumb2/pic-load.ll
@@ -1,4 +1,5 @@
-; RUN: llc < %s -mtriple=thumbv7-apple-darwin9 -relocation-model=pic | FileCheck %s
+; RUN: llc < %s -mtriple=thumbv7-apple-darwin9 -relocation-model=pic | FileCheck %s --check-prefix=CHECK --check-prefix=PIC
+; RUN: llc < %s -mtriple=thumbv7-apple-ios -relocation-model=pic -mcpu=swift -mattr=+no-movt | FileCheck %s --check-prefix=CHECK --check-prefix=PIC-NOMOVT
 
 	%struct.anon = type { void ()* }
 	%struct.one_atexit_routine = type { %struct.anon, i32, i8* }
@@ -8,7 +9,14 @@
 define hidden i32 @atexit(void ()* %func) nounwind {
 entry:
 ; CHECK-LABEL: atexit:
-; CHECK: add r0, pc
+; CHECK-PIC: add r0, pc
+; CHECK-NOMOVT: ldr r[[REGNUM:[0-9]+]], LCPI0_0
+; CHECK-NOMOVT: LPC0_0:
+; CHECK-NOMOVT: add r[[REGNUM]], pc
+; CHECK-NOMOVT: ldr r1, [r[[REGNUM]]
+; CHECK-NOMOVT: blx _atexit_common
+; CHECK-NOMOVT: LCPI0_0:
+; CHECK-NOMOVT: .long L___dso_handle$non_lazy_ptr-(LPC0_0+4)
 	%r = alloca %struct.one_atexit_routine, align 4		; <%struct.one_atexit_routine*> [#uses=3]
 	%0 = getelementptr %struct.one_atexit_routine, %struct.one_atexit_routine* %r, i32 0, i32 0, i32 0		; <void ()**> [#uses=1]
 	store void ()* %func, void ()** %0, align 4