MOV64rm should be marked isReMaterializable.

llvm-svn: 89019

2 files changed, 43 insertions, 1 deletions

diff --git a/llvm/lib/Target/X86/X86Instr64bit.td b/llvm/lib/Target/X86/X86Instr64bit.td
index 3edced7b43e..a01534b70d2 100644
--- a/llvm/lib/Target/X86/X86Instr64bit.td
+++ b/llvm/lib/Target/X86/X86Instr64bit.td
@@ -309,7 +309,7 @@ def MOV64ri32 : RIi32<0xC7, MRM0r, (outs GR64:$dst), (ins i64i32imm:$src),
                       [(set GR64:$dst, i64immSExt32:$src)]>;
 }
 
-let canFoldAsLoad = 1 in
+let canFoldAsLoad = 1, isReMaterializable = 1, mayHaveSideEffects = 1 in
 def MOV64rm : RI<0x8B, MRMSrcMem, (outs GR64:$dst), (ins i64mem:$src),
                  "mov{q}\t{$src, $dst|$dst, $src}",
                  [(set GR64:$dst, (load addr:$src))]>;
diff --git a/llvm/test/CodeGen/X86/2009-11-16-MachineLICM.ll b/llvm/test/CodeGen/X86/2009-11-16-MachineLICM.ll
new file mode 100644
index 00000000000..a7c202076da
--- /dev/null
+++ b/llvm/test/CodeGen/X86/2009-11-16-MachineLICM.ll
@@ -0,0 +1,42 @@
+; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
+; rdar://7395200
+
+@g = common global [4 x float] zeroinitializer, align 16 ; <[4 x float]*> [#uses=4]
+
+define void @foo(i32 %n, float* nocapture %x) nounwind ssp {
+entry:
+; CHECK: foo:
+  %0 = icmp sgt i32 %n, 0                         ; <i1> [#uses=1]
+  br i1 %0, label %bb.nph, label %return
+
+bb.nph:                                           ; preds = %entry
+; CHECK: movq _g@GOTPCREL(%rip), %rcx
+  %tmp = zext i32 %n to i64                       ; <i64> [#uses=1]
+  br label %bb
+
+bb:                                               ; preds = %bb, %bb.nph
+; CHECK: LBB1_2:
+  %indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %bb ] ; <i64> [#uses=2]
+  %tmp9 = shl i64 %indvar, 2                      ; <i64> [#uses=4]
+  %tmp1016 = or i64 %tmp9, 1                      ; <i64> [#uses=1]
+  %scevgep = getelementptr float* %x, i64 %tmp1016 ; <float*> [#uses=1]
+  %tmp1117 = or i64 %tmp9, 2                      ; <i64> [#uses=1]
+  %scevgep12 = getelementptr float* %x, i64 %tmp1117 ; <float*> [#uses=1]
+  %tmp1318 = or i64 %tmp9, 3                      ; <i64> [#uses=1]
+  %scevgep14 = getelementptr float* %x, i64 %tmp1318 ; <float*> [#uses=1]
+  %x_addr.03 = getelementptr float* %x, i64 %tmp9 ; <float*> [#uses=1]
+  %1 = load float* getelementptr inbounds ([4 x float]* @g, i64 0, i64 0), align 16 ; <float> [#uses=1]
+  store float %1, float* %x_addr.03, align 4
+  %2 = load float* getelementptr inbounds ([4 x float]* @g, i64 0, i64 1), align 4 ; <float> [#uses=1]
+  store float %2, float* %scevgep, align 4
+  %3 = load float* getelementptr inbounds ([4 x float]* @g, i64 0, i64 2), align 8 ; <float> [#uses=1]
+  store float %3, float* %scevgep12, align 4
+  %4 = load float* getelementptr inbounds ([4 x float]* @g, i64 0, i64 3), align 4 ; <float> [#uses=1]
+  store float %4, float* %scevgep14, align 4
+  %indvar.next = add i64 %indvar, 1               ; <i64> [#uses=2]
+  %exitcond = icmp eq i64 %indvar.next, %tmp      ; <i1> [#uses=1]
+  br i1 %exitcond, label %return, label %bb
+
+return:                                           ; preds = %bb, %entry
+  ret void
+}