Tail merging pass shall not break up IT blocks. rdar://8115404

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106517 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 127 insertions, 0 deletions

diff --git a/test/CodeGen/Thumb2/2010-06-21-TailMergeBug.ll b/test/CodeGen/Thumb2/2010-06-21-TailMergeBug.ll
new file mode 100644
index 0000000000..c5fc5098cd
--- /dev/null
+++ b/test/CodeGen/Thumb2/2010-06-21-TailMergeBug.ll
@@ -0,0 +1,127 @@
+; RUN: llc < %s -mtriple=thumbv7-apple-darwin -O3 -relocation-model=pic -mcpu=cortex-a8 | FileCheck %s
+; rdar://8115404
+; Tail merging must not split an IT block.
+
+%struct.FILE = type { i8*, i32, i32, i16, i16, %struct.__sbuf, i32, i8*, i32 (i8*)*, i32 (i8*, i8*, i32)*, i64 (i8*, i64, i32)*, i32 (i8*, i8*, i32)*, %struct.__sbuf, %struct.__sFILEX*, i32, [3 x i8], [1 x i8], %struct.__sbuf, i32, i64 }
+%struct._RuneCharClass = type { [14 x i8], i32 }
+%struct._RuneEntry = type { i32, i32, i32, i32* }
+%struct._RuneLocale = type { [8 x i8], [32 x i8], i32 (i8*, i32, i8**)*, i32 (i32, i8*, i32, i8**)*, i32, [256 x i32], [256 x i32], [256 x i32], %struct._RuneRange, %struct._RuneRange, %struct._RuneRange, i8*, i32, i32, %struct._RuneCharClass* }
+%struct._RuneRange = type { i32, %struct._RuneEntry* }
+%struct.__sFILEX = type opaque
+%struct.__sbuf = type { i8*, i32 }
+
+@finput = external global %struct.FILE*           ; <%struct.FILE**> [#uses=1]
+@_DefaultRuneLocale = external global %struct._RuneLocale ; <%struct._RuneLocale*> [#uses=0]
+@token_buffer = external global [1025 x i8], align 4 ; <[1025 x i8]*> [#uses=1]
+@.str73 = external constant [6 x i8], align 4     ; <[6 x i8]*> [#uses=0]
+@.str174 = external constant [5 x i8], align 4    ; <[5 x i8]*> [#uses=0]
+@.str275 = external constant [6 x i8], align 4    ; <[6 x i8]*> [#uses=0]
+@.str376 = external constant [5 x i8], align 4    ; <[5 x i8]*> [#uses=0]
+@.str477 = external constant [6 x i8], align 4    ; <[6 x i8]*> [#uses=0]
+@.str578 = external constant [6 x i8], align 4    ; <[6 x i8]*> [#uses=0]
+@.str679 = external constant [7 x i8], align 4    ; <[7 x i8]*> [#uses=0]
+@.str780 = external constant [6 x i8], align 4    ; <[6 x i8]*> [#uses=0]
+@.str881 = external constant [5 x i8], align 4    ; <[5 x i8]*> [#uses=0]
+@.str982 = external constant [6 x i8], align 4    ; <[6 x i8]*> [#uses=0]
+@.str1083 = external constant [9 x i8], align 4   ; <[9 x i8]*> [#uses=0]
+@.str1184 = external constant [7 x i8], align 4   ; <[7 x i8]*> [#uses=0]
+@.str1285 = external constant [16 x i8], align 4  ; <[16 x i8]*> [#uses=0]
+@.str1386 = external constant [12 x i8], align 4  ; <[12 x i8]*> [#uses=0]
+@.str1487 = external constant [5 x i8], align 4   ; <[5 x i8]*> [#uses=0]
+@llvm.used = external global [1 x i8*]            ; <[1 x i8*]*> [#uses=0]
+
+define fastcc i32 @parse_percent_token() nounwind {
+entry:
+; CHECK: ittt eq
+; CHECK: ittt eq
+; CHECK: ittt eq
+; CHECK: ittt eq
+; CHECK: ittt eq
+; CHECK: moveq r0
+; CHECK-NOT: LBB0_
+; CHECK: ldreq
+; CHECK: popeq
+  switch i32 undef, label %bb7 [
+    i32 37, label %bb43
+    i32 48, label %bb5
+    i32 50, label %bb4
+    i32 60, label %bb2
+    i32 61, label %bb6
+    i32 62, label %bb3
+    i32 123, label %bb1
+  ]
+
+bb1:                                              ; preds = %entry
+  ret i32 8
+
+bb2:                                              ; preds = %entry
+  ret i32 15
+
+bb3:                                              ; preds = %entry
+  ret i32 16
+
+bb4:                                              ; preds = %entry
+  ret i32 17
+
+bb5:                                              ; preds = %entry
+  ret i32 9
+
+bb6:                                              ; preds = %entry
+  ret i32 18
+
+bb7:                                              ; preds = %entry
+  br i1 undef, label %bb.i.i, label %bb1.i.i
+
+bb.i.i:                                           ; preds = %bb7
+  br i1 undef, label %bb43, label %bb12
+
+bb1.i.i:                                          ; preds = %bb7
+  unreachable
+
+bb9:                                              ; preds = %bb.i.i2
+  br i1 undef, label %bb10, label %bb11
+
+bb10:                                             ; preds = %bb9
+  br label %bb11
+
+bb11:                                             ; preds = %bb10, %bb9
+  %p.0 = phi i8* [ undef, %bb10 ], [ %p.1, %bb9 ] ; <i8*> [#uses=1]
+  %0 = load %struct.FILE** @finput, align 4       ; <%struct.FILE*> [#uses=1]
+  %1 = tail call i32 @getc(%struct.FILE* %0) nounwind ; <i32> [#uses=0]
+  br label %bb12
+
+bb12:                                             ; preds = %bb11, %bb.i.i
+  %p.1 = phi i8* [ %p.0, %bb11 ], [ getelementptr inbounds ([1025 x i8]* @token_buffer, i32 0, i32 0), %bb.i.i ] ; <i8*> [#uses=2]
+  %2 = icmp ult i32 undef, 128                    ; <i1> [#uses=1]
+  br i1 %2, label %bb.i.i2, label %bb1.i.i3
+
+bb.i.i2:                                          ; preds = %bb12
+  %3 = load i32* null, align 4                    ; <i32> [#uses=1]
+  %4 = lshr i32 %3, 8                             ; <i32> [#uses=1]
+  %.lobit.i1 = and i32 %4, 1                      ; <i32> [#uses=1]
+  %.not = icmp ne i32 %.lobit.i1, 0               ; <i1> [#uses=1]
+  %or.cond = or i1 %.not, undef                   ; <i1> [#uses=1]
+  br i1 %or.cond, label %bb9, label %bb14
+
+bb1.i.i3:                                         ; preds = %bb12
+  unreachable
+
+bb14:                                             ; preds = %bb.i.i2
+  store i8 0, i8* %p.1, align 1
+  br i1 undef, label %bb43, label %bb15
+
+bb15:                                             ; preds = %bb14
+  unreachable
+
+bb43:                                             ; preds = %bb14, %bb.i.i, %entry
+  %.0 = phi i32 [ 7, %entry ], [ 24, %bb.i.i ], [ 9, %bb14 ] ; <i32> [#uses=1]
+  ret i32 %.0
+}
+
+declare i32 @getc(%struct.FILE* nocapture) nounwind
+
+declare i32 @strcmp(i8* nocapture, i8* nocapture) nounwind readonly
+
+declare i32 @__maskrune(i32, i32)
+
+declare i32 @ungetc(i32, %struct.FILE* nocapture) nounwind