[ARM] Add machine scheduler for Cortex-R52

This patch adds the Sched Machine Model for Cortex-R52.

Details of the pipeline and descriptions are in comments
in file ARMScheduleR52.td included in this patch.

Reviewers: rengolin, jmolloy

Differential Revision: https://reviews.llvm.org/D26500

llvm-svn: 286949

1 files changed, 39 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/ARM/cortexr52-misched-basic.ll b/llvm/test/CodeGen/ARM/cortexr52-misched-basic.ll
new file mode 100644
index 00000000000..3ccb34d9fc9
--- /dev/null
+++ b/llvm/test/CodeGen/ARM/cortexr52-misched-basic.ll
@@ -0,0 +1,39 @@
+; REQUIRES: asserts
+; RUN: llc < %s -mtriple=armv8r-eabi -mcpu=cortex-r52 -enable-misched -verify-misched -debug-only=misched -o - 2>&1 > /dev/null | FileCheck %s --check-prefix=CHECK --check-prefix=R52_SCHED
+; RUN: llc < %s -mtriple=armv8r-eabi -mcpu=generic    -enable-misched -verify-misched -debug-only=misched -o - 2>&1 > /dev/null | FileCheck %s --check-prefix=CHECK --check-prefix=GENERIC
+;
+; Check the latency for instructions for both generic and cortex-r52.
+; Cortex-r52 machine model will cause the div to be sceduled before eor
+; as div takes more cycles to compute than eor.
+;
+; CHECK:       ********** MI Scheduling **********
+; CHECK:      foo:BB#0 entry
+; CHECK:      EORrr
+; GENERIC:    Latency    : 1
+; R52_SCHED:  Latency    : 3
+; CHECK:      MLA
+; GENERIC:    Latency    : 1
+; R52_SCHED:  Latency    : 4
+; CHECK:      SDIV
+; GENERIC:    Latency    : 1
+; R52_SCHED:  Latency    : 8
+; CHECK:      ** Final schedule for BB#0 ***
+; GENERIC:    EORrr
+; GENERIC:    SDIV
+; R52_SCHED:  SDIV
+; R52_SCHED:  EORrr
+; CHECK:      ********** INTERVALS **********
+
+target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
+target triple = "armv8r-arm-none-eabi"
+
+; Function Attrs: norecurse nounwind readnone
+define hidden i32 @foo(i32 %a, i32 %b, i32 %c) local_unnamed_addr #0 {
+entry:
+  %xor = xor i32 %c, %b
+  %mul = mul nsw i32 %xor, %c
+  %add = add nsw i32 %mul, %a
+  %div = sdiv i32 %a, %b
+  %sub = sub i32 %add, %div
+  ret i32 %sub
+}