[ARM] Add Thumb1 coverage for cmn testcases.

There's a missed optimization for immediates: we can save two
instructions by using adds instead of movs+mvns+cmp.

llvm-svn: 335002

1 files changed, 45 insertions, 6 deletions

diff --git a/llvm/test/CodeGen/ARM/cmn.ll b/llvm/test/CodeGen/ARM/cmn.ll
index cc3d1fc19dc..9321527a9e2 100644
--- a/llvm/test/CodeGen/ARM/cmn.ll
+++ b/llvm/test/CodeGen/ARM/cmn.ll
@@ -1,20 +1,59 @@
-; RUN: llc < %s -mtriple thumbv7-apple-ios | FileCheck %s
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple thumbv7-eabi | FileCheck %s -check-prefix=T2
+; RUN: llc < %s -mtriple thumbv6m-eabi | FileCheck %s -check-prefix=T1
 ; <rdar://problem/7569620>
 
 define i32 @compare_i_gt(i32 %a) {
+; T2-LABEL: compare_i_gt:
+; T2:       @ %bb.0: @ %entry
+; T2-NEXT:    movs r1, #24
+; T2-NEXT:    cmn.w r0, #78
+; T2-NEXT:    it gt
+; T2-NEXT:    movgt r1, #42
+; T2-NEXT:    mov r0, r1
+; T2-NEXT:    bx lr
+;
+; T1-LABEL: compare_i_gt:
+; T1:       @ %bb.0: @ %entry
+; T1-NEXT:    mov r1, r0
+; T1-NEXT:    movs r0, #77
+; T1-NEXT:    mvns r3, r0
+; T1-NEXT:    movs r0, #42
+; T1-NEXT:    movs r2, #24
+; T1-NEXT:    cmp r1, r3
+; T1-NEXT:    bgt .LBB0_2
+; T1-NEXT:  @ %bb.1: @ %entry
+; T1-NEXT:    mov r0, r2
+; T1-NEXT:  .LBB0_2: @ %entry
+; T1-NEXT:    bx lr
 entry:
-; CHECK:     compare_i_gt
-; CHECK-NOT: mvn
-; CHECK:     cmn
   %cmp = icmp sgt i32 %a, -78
   %ret = select i1 %cmp, i32 42, i32 24
   ret i32 %ret
 }
 
 define i32 @compare_r_eq(i32 %a, i32 %b) {
+; T2-LABEL: compare_r_eq:
+; T2:       @ %bb.0: @ %entry
+; T2-NEXT:    movs r2, #24
+; T2-NEXT:    cmn r0, r1
+; T2-NEXT:    it eq
+; T2-NEXT:    moveq r2, #42
+; T2-NEXT:    mov r0, r2
+; T2-NEXT:    bx lr
+;
+; T1-LABEL: compare_r_eq:
+; T1:       @ %bb.0: @ %entry
+; T1-NEXT:    mov r2, r0
+; T1-NEXT:    movs r0, #42
+; T1-NEXT:    movs r3, #24
+; T1-NEXT:    cmn r2, r1
+; T1-NEXT:    beq .LBB1_2
+; T1-NEXT:  @ %bb.1: @ %entry
+; T1-NEXT:    mov r0, r3
+; T1-NEXT:  .LBB1_2: @ %entry
+; T1-NEXT:    bx lr
 entry:
-; CHECK: compare_r_eq
-; CHECK: cmn
   %sub = sub nsw i32 0, %b
   %cmp = icmp eq i32 %a, %sub
   %ret = select i1 %cmp, i32 42, i32 24