1 files changed, 66 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/machine-licm.ll b/test/CodeGen/ARM/machine-licm.ll
new file mode 100644
index 0000000..8656c5b
--- /dev/null
+++ b/test/CodeGen/ARM/machine-licm.ll
@@ -0,0 +1,66 @@
+; RUN: llc < %s -mtriple=thumb-apple-darwin -relocation-model=pic -disable-fp-elim | FileCheck %s -check-prefix=THUMB
+; RUN: llc < %s -mtriple=arm-apple-darwin -relocation-model=pic -disable-fp-elim   | FileCheck %s -check-prefix=ARM
+; RUN: llc < %s -mtriple=arm-apple-darwin -relocation-model=pic -disable-fp-elim -mattr=+v6t2 | FileCheck %s -check-prefix=MOVT
+; rdar://7353541
+; rdar://7354376
+; rdar://8887598
+
+; The generated code is no where near ideal. It's not recognizing the two
+; constantpool entries being loaded can be merged into one.
+
+@GV = external global i32                         ; <i32*> [#uses=2]
+
+define void @t(i32* nocapture %vals, i32 %c) nounwind {
+entry:
+; ARM: t:
+; ARM: ldr [[REGISTER_1:r[0-9]+]], LCPI0_0
+; Unfortunately currently ARM codegen doesn't cse the ldr from constantpool.
+; The issue is it can be read by an "add pc" or a "ldr [pc]" so it's messy
+; to add the pseudo instructions to make sure they are CSE'ed at the same
+; time as the "ldr cp".
+; ARM: ldr r{{[0-9]+}}, LCPI0_1
+; ARM: LPC0_0:
+; ARM: ldr r{{[0-9]+}}, [pc, [[REGISTER_1]]]
+; ARM: ldr r{{[0-9]+}}, [r{{[0-9]+}}]
+
+; MOVT: t:
+; MOVT: movw [[REGISTER_2:r[0-9]+]], :lower16:(L_GV$non_lazy_ptr-(LPC0_0+8))
+; MOVT: movt [[REGISTER_2]], :upper16:(L_GV$non_lazy_ptr-(LPC0_0+8))
+; MOVT: LPC0_0:
+; MOVT: ldr r{{[0-9]+}}, [pc, [[REGISTER_2]]]
+; MOVT: ldr r{{[0-9]+}}, [r{{[0-9]+}}]
+
+; THUMB: t:
+  %0 = icmp eq i32 %c, 0                          ; <i1> [#uses=1]
+  br i1 %0, label %return, label %bb.nph
+
+bb.nph:                                           ; preds = %entry
+; ARM: LCPI0_0:
+; ARM: LCPI0_1:
+; ARM: .section
+
+; THUMB: BB#1
+; THUMB: ldr.n r2, LCPI0_0
+; THUMB: add r2, pc
+; THUMB: ldr r{{[0-9]+}}, [r2]
+; THUMB: LBB0_2
+; THUMB: LCPI0_0:
+; THUMB-NOT: LCPI0_1:
+; THUMB: .section
+  %.pre = load i32* @GV, align 4                  ; <i32> [#uses=1]
+  br label %bb
+
+bb:                                               ; preds = %bb, %bb.nph
+  %1 = phi i32 [ %.pre, %bb.nph ], [ %3, %bb ]    ; <i32> [#uses=1]
+  %i.03 = phi i32 [ 0, %bb.nph ], [ %4, %bb ]     ; <i32> [#uses=2]
+  %scevgep = getelementptr i32* %vals, i32 %i.03  ; <i32*> [#uses=1]
+  %2 = load i32* %scevgep, align 4                ; <i32> [#uses=1]
+  %3 = add nsw i32 %1, %2                         ; <i32> [#uses=2]
+  store i32 %3, i32* @GV, align 4
+  %4 = add i32 %i.03, 1                           ; <i32> [#uses=2]
+  %exitcond = icmp eq i32 %4, %c                  ; <i1> [#uses=1]
+  br i1 %exitcond, label %return, label %bb
+
+return:                                           ; preds = %bb, %entry
+  ret void
+}