PostRA antidependence breaker unit test for PR8986.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125091 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/ARM/2011-02-07-AntidepClobber.ll b/test/CodeGen/ARM/2011-02-07-AntidepClobber.ll
new file mode 100644 (file)
index 0000000..f3d7888
--- /dev/null
+++ b/test/CodeGen/ARM/2011-02-07-AntidepClobber.ll
@@ -0,0 +1,89 @@
+; RUN: llc < %s -asm-verbose=false -O3  -mtriple=armv5e-none-linux-gnueabi | FileCheck %s
+; PR8986: PostRA antidependence breaker must respect "earlyclobber".
+; armv5e generates mulv5 that cannot used the same reg for src/dest.
+
+; ModuleID = '<stdin>'
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:64:128-a0:0:64-n32"
+target triple = "armv5e-none-linux-gnueabi"
+
+define hidden fastcc void @storeAtts() nounwind {
+entry:
+  %.SV116 = alloca i8**
+  br i1 undef, label %meshBB520, label %meshBB464
+
+bb15:                                             ; preds = %meshBB424
+  br i1 undef, label %bb216, label %meshBB396
+
+bb22:                                             ; preds = %meshBB396
+  br label %cBB564
+
+cBB564:                                           ; preds = %cBB564, %bb22
+  br label %cBB564
+
+poolStoreString.exit.thread:                      ; preds = %meshBB424
+  ret void
+
+bb78:                                             ; preds = %meshBB412
+  unreachable
+
+bb129:                                            ; preds = %meshBB540
+  br i1 undef, label %bb131.loopexit, label %meshBB540
+
+bb131.loopexit:                                   ; preds = %bb129
+  br label %bb131
+
+bb131:                                            ; preds = %bb135, %bb131.loopexit
+  br i1 undef, label %bb134, label %meshBB396
+
+bb134:                                            ; preds = %bb131
+  unreachable
+
+bb135:                                            ; preds = %meshBB396
+  %uriHash.1.phi.load = load i32* undef
+  %.load120 = load i8*** %.SV116
+  %.phi24 = load i8* null
+  %.phi26 = load i8** null
+  store i8 %.phi24, i8* %.phi26, align 1
+  %0 = getelementptr inbounds i8* %.phi26, i32 1
+  store i8* %0, i8** %.load120, align 4
+  ; CHECK: mul [[REGISTER:lr|r[0-9]+]],
+  ; CHECK-NOT: [[REGISTER]],
+  ; CHECK: {{(lr|r[0-9]+)$}}
+  %1 = mul i32 %uriHash.1.phi.load, 1000003
+  %2 = xor i32 0, %1
+  store i32 %2, i32* null
+  %3 = load i8* null, align 1
+  %4 = icmp eq i8 %3, 0
+  store i8* %0, i8** undef
+  br i1 %4, label %meshBB472, label %bb131
+
+bb212:                                            ; preds = %meshBB540
+  unreachable
+
+bb216:                                            ; preds = %bb15
+  ret void
+
+meshBB396:                                        ; preds = %bb131, %bb15
+  br i1 undef, label %bb135, label %bb22
+
+meshBB412:                                        ; preds = %meshBB464
+  br i1 undef, label %meshBB504, label %bb78
+
+meshBB424:                                        ; preds = %meshBB464
+  br i1 undef, label %poolStoreString.exit.thread, label %bb15
+
+meshBB464:                                        ; preds = %entry
+  br i1 undef, label %meshBB424, label %meshBB412
+
+meshBB472:                                        ; preds = %meshBB504, %bb135
+  unreachable
+
+meshBB504:                                        ; preds = %meshBB412
+  br label %meshBB472
+
+meshBB520:                                        ; preds = %entry
+  br label %meshBB540
+
+meshBB540:                                        ; preds = %meshBB520, %bb129
+  br i1 undef, label %bb212, label %bb129
+}