[ARM] support for Cortex-R4/R4F

Currently, llvm (backend) doesn't know cortex-r4, even though it is the
default target for armv7r. Using "--target=armv7r-arm-none-eabi" provokes
'cortex-r4' is not a recognized processor for this target' by llvm.
This patch adds support for cortex-r4 and, very closely related, r4f.

llvm-svn: 234486

5 files changed, 81 insertions, 12 deletions

diff --git a/llvm/lib/Target/ARM/ARM.td b/llvm/lib/Target/ARM/ARM.td
index 9bbe4014815..9882227905c 100644
--- a/llvm/lib/Target/ARM/ARM.td
+++ b/llvm/lib/Target/ARM/ARM.td
@@ -255,6 +255,14 @@ def ProcA57     : SubtargetFeature<"a57", "ARMProcFamily", "CortexA57",
                                     FeatureTrustZone, FeatureT2XtPk,
                                     FeatureCrypto, FeatureCRC]>;
 
+def ProcR4      : SubtargetFeature<"r4", "ARMProcFamily", "CortexR4",
+                                   "Cortex-R4 ARM processors",
+                                   [FeatureHWDiv,
+                                    FeatureAvoidPartialCPSR,
+                                    FeatureDSPThumb2, FeatureT2XtPk,
+                                    HasV7Ops, FeatureDB, FeatureHasRAS,
+                                    FeatureRClass]>;
+
 def ProcR5      : SubtargetFeature<"r5", "ARMProcFamily", "CortexR5",
                                    "Cortex-R5 ARM processors",
                                    [FeatureSlowFPBrcc,
@@ -391,6 +399,16 @@ def : ProcessorModel<"krait",       CortexA9Model,
                                      FeatureDSPThumb2, FeatureHasRAS,
                                      FeatureAClass]>;
 
+// FIXME: R4 has currently the same ProcessorModel as A8.
+def : ProcessorModel<"cortex-r4",   CortexA8Model,
+                                    [ProcR4]>;
+
+// FIXME: R4F has currently the same ProcessorModel as A8.
+def : ProcessorModel<"cortex-r4f",  CortexA8Model,
+                                    [ProcR4,
+                                     FeatureSlowFPBrcc, FeatureHasSlowFPVMLx,
+                                     FeatureVFP3, FeatureVFPOnlySP, FeatureD16]>;
+
 // FIXME: R5 has currently the same ProcessorModel as A8.
 def : ProcessorModel<"cortex-r5",   CortexA8Model,
                                     [ProcR5, HasV7Ops, FeatureDB,
diff --git a/llvm/lib/Target/ARM/ARMSubtarget.h b/llvm/lib/Target/ARM/ARMSubtarget.h
index b8e8242fe95..0b8b7801f3d 100644
--- a/llvm/lib/Target/ARM/ARMSubtarget.h
+++ b/llvm/lib/Target/ARM/ARMSubtarget.h
@@ -43,7 +43,7 @@ class ARMSubtarget : public ARMGenSubtargetInfo {
 protected:
   enum ARMProcFamilyEnum {
     Others, CortexA5, CortexA7, CortexA8, CortexA9, CortexA12, CortexA15,
-    CortexA17, CortexR5, Swift, CortexA53, CortexA57, Krait, 
+    CortexA17, CortexR4, CortexR4F, CortexR5, Swift, CortexA53, CortexA57, Krait,
   };
   enum ARMProcClassEnum {
     None, AClass, RClass, MClass
diff --git a/llvm/test/CodeGen/ARM/build-attributes.ll b/llvm/test/CodeGen/ARM/build-attributes.ll
index 8540833e7a9..1982fa98ef4 100644
--- a/llvm/test/CodeGen/ARM/build-attributes.ll
+++ b/llvm/test/CodeGen/ARM/build-attributes.ll
@@ -81,6 +81,8 @@
 ; RUN: llc < %s -mtriple=thumbv7em-linux-gnueabi -mcpu=cortex-m7 -mattr=+fp-only-sp  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-M7-FAST
 ; RUN: llc < %s -mtriple=thumbv7em-linux-gnueabi -mcpu=cortex-m7 | FileCheck %s --check-prefix=CORTEX-M7-DOUBLE
 ; RUN: llc < %s -mtriple=thumbv7em-linux-gnueabi -mcpu=cortex-m7 -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
+; RUN: llc < %s -mtriple=armv7r-linux-gnueabi -mcpu=cortex-r4 | FileCheck %s --check-prefix=CORTEX-R4
+; RUN: llc < %s -mtriple=armv7r-linux-gnueabi -mcpu=cortex-r4f | FileCheck %s --check-prefix=CORTEX-R4F
 ; RUN: llc < %s -mtriple=armv7r-linux-gnueabi -mcpu=cortex-r5 | FileCheck %s --check-prefix=CORTEX-R5
 ; RUN: llc < %s -mtriple=armv7r-linux-gnueabi -mcpu=cortex-r5  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-R5-FAST
 ; RUN: llc < %s -mtriple=armv7r-linux-gnueabi -mcpu=cortex-r5 -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
@@ -1012,6 +1014,49 @@
 ; CORTEX-M7-NOFPU-FAST-NOT:  .eabi_attribute 22
 ; CORTEX-M7-NOFPU-FAST:  .eabi_attribute 23, 1
 
+; CORTEX-R4:  .cpu cortex-r4
+; CORTEX-R4:  .eabi_attribute 6, 10
+; CORTEX-R4:  .eabi_attribute 7, 82
+; CORTEX-R4:  .eabi_attribute 8, 1
+; CORTEX-R4:  .eabi_attribute 9, 2
+; CORTEX-R4-NOT:  .fpu vfpv3-d16
+; CORTEX-R4-NOT:   .eabi_attribute 19
+;; We default to IEEE 754 compliance
+; CORTEX-R4:  .eabi_attribute 20, 1
+; CORTEX-R4:  .eabi_attribute 21, 1
+; CORTEX-R4-NOT:  .eabi_attribute 22
+; CORTEX-R4:  .eabi_attribute 23, 3
+; CORTEX-R4:  .eabi_attribute 24, 1
+; CORTEX-R4:  .eabi_attribute 25, 1
+; CORTEX-R4-NOT:  .eabi_attribute 28
+; CORTEX-R4-NOT:  .eabi_attribute 36
+; CORTEX-R4:  .eabi_attribute 38, 1
+; CORTEX-R4-NOT:  .eabi_attribute 42
+; CORTEX-R4-NOT:  .eabi_attribute 44
+; CORTEX-R4-NOT:  .eabi_attribute 68
+
+; CORTEX-R4F:  .cpu cortex-r4f
+; CORTEX-R4F:  .eabi_attribute 6, 10
+; CORTEX-R4F:  .eabi_attribute 7, 82
+; CORTEX-R4F:  .eabi_attribute 8, 1
+; CORTEX-R4F:  .eabi_attribute 9, 2
+; CORTEX-R4F:  .fpu vfpv3-d16
+; CORTEX-R4F-NOT:   .eabi_attribute 19
+;; We default to IEEE 754 compliance
+; CORTEX-R4F:  .eabi_attribute 20, 1
+; CORTEX-R4F:  .eabi_attribute 21, 1
+; CORTEX-R4F-NOT:  .eabi_attribute 22
+; CORTEX-R4F:  .eabi_attribute 23, 3
+; CORTEX-R4F:  .eabi_attribute 24, 1
+; CORTEX-R4F:  .eabi_attribute 25, 1
+; CORTEX-R4F:  .eabi_attribute 27, 1
+; CORTEX-R4F-NOT:  .eabi_attribute 28
+; CORTEX-R4F-NOT:  .eabi_attribute 36
+; CORTEX-R4F:  .eabi_attribute 38, 1
+; CORTEX-R4F-NOT:  .eabi_attribute 42
+; CORTEX-R4F-NOT:  .eabi_attribute 44
+; CORTEX-R4F-NOT:  .eabi_attribute 68
+
 ; CORTEX-R5:  .cpu cortex-r5
 ; CORTEX-R5:  .eabi_attribute 6, 10
 ; CORTEX-R5:  .eabi_attribute 7, 82
diff --git a/llvm/test/CodeGen/ARM/div.ll b/llvm/test/CodeGen/ARM/div.ll
index a339c816c57..7b298fee42a 100644
--- a/llvm/test/CodeGen/ARM/div.ll
+++ b/llvm/test/CodeGen/ARM/div.ll
@@ -1,11 +1,13 @@
-; RUN: llc < %s -mtriple=arm-apple-ios -mcpu=cortex-a8 | FileCheck %s -check-prefix=CHECK-ARM
-; RUN: llc < %s -mtriple=arm-apple-ios -mcpu=swift     | FileCheck %s -check-prefix=CHECK-HWDIV
-; RUN: llc < %s -mtriple=arm-apple-ios -mcpu=cortex-r5 | FileCheck %s -check-prefix=CHECK-HWDIV
+; RUN: llc < %s -mtriple=arm-apple-ios -mcpu=cortex-a8    | FileCheck %s -check-prefix=CHECK-SWDIV
+; RUN: llc < %s -mtriple=arm-apple-ios -mcpu=swift        | FileCheck %s -check-prefix=CHECK-HWDIV
+; RUN: llc < %s -mtriple=arm-apple-ios -mcpu=cortex-r4    | FileCheck %s -check-prefix=CHECK-SWDIV
+; RUN: llc < %s -mtriple=arm-apple-ios -mcpu=cortex-r4f   | FileCheck %s -check-prefix=CHECK-SWDIV
+; RUN: llc < %s -mtriple=arm-apple-ios -mcpu=cortex-r5    | FileCheck %s -check-prefix=CHECK-HWDIV
 
 define i32 @f1(i32 %a, i32 %b) {
 entry:
-; CHECK-ARM: f1
-; CHECK-ARM: __divsi3
+; CHECK-SWDIV: f1
+; CHECK-SWDIV: __divsi3
 
 ; CHECK-HWDIV: f1
 ; CHECK-HWDIV: sdiv
@@ -15,8 +17,8 @@ entry:
 
 define i32 @f2(i32 %a, i32 %b) {
 entry:
-; CHECK-ARM: f2
-; CHECK-ARM: __udivsi3
+; CHECK-SWDIV: f2
+; CHECK-SWDIV: __udivsi3
 
 ; CHECK-HWDIV: f2
 ; CHECK-HWDIV: udiv
@@ -26,8 +28,8 @@ entry:
 
 define i32 @f3(i32 %a, i32 %b) {
 entry:
-; CHECK-ARM: f3
-; CHECK-ARM: __modsi3
+; CHECK-SWDIV: f3
+; CHECK-SWDIV: __modsi3
 
 ; CHECK-HWDIV: f3
 ; CHECK-HWDIV: sdiv
@@ -38,8 +40,8 @@ entry:
 
 define i32 @f4(i32 %a, i32 %b) {
 entry:
-; CHECK-ARM: f4
-; CHECK-ARM: __umodsi3
+; CHECK-SWDIV: f4
+; CHECK-SWDIV: __umodsi3
 
 ; CHECK-HWDIV: f4
 ; CHECK-HWDIV: udiv
diff --git a/llvm/test/CodeGen/Thumb2/div.ll b/llvm/test/CodeGen/Thumb2/div.ll
index b273a890326..80a842dc07f 100644
--- a/llvm/test/CodeGen/Thumb2/div.ll
+++ b/llvm/test/CodeGen/Thumb2/div.ll
@@ -4,6 +4,10 @@
 ; RUN:    | FileCheck %s -check-prefix=CHECK-THUMBV7M
 ; RUN: llc -mtriple=thumb-apple-darwin -mcpu=swift %s -o - \
 ; RUN:    | FileCheck %s -check-prefix=CHECK-HWDIV
+; RUN: llc -mtriple=thumb-apple-darwin -mcpu=cortex-r4 %s -o - \
+; RUN:    | FileCheck %s -check-prefix=CHECK-HWDIV
+; RUN: llc -mtriple=thumb-apple-darwin -mcpu=cortex-r4f %s -o - \
+; RUN:    | FileCheck %s -check-prefix=CHECK-HWDIV
 ; RUN: llc -mtriple=thumb-apple-darwin -mcpu=cortex-r5 %s -o - \
 ; RUN:    | FileCheck %s -check-prefix=CHECK-HWDIV