Fix for PR26690 take 2

This is what was meant to be in the initial commit to fix this bug. The
parens were missing. This commit also adds a test case for the bug and
has undergone full testing on PPC and X86.

llvm-svn: 261546

1 files changed, 118 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/PowerPC/pr26690.ll b/llvm/test/CodeGen/PowerPC/pr26690.ll
new file mode 100644
index 00000000000..3e7662409d5
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/pr26690.ll
@@ -0,0 +1,118 @@
+; RUN: llc -mcpu=pwr8 -mtriple=powerpc64le-unknown-linux-gnu < %s | FileCheck %s
+
+%struct.anon = type { %struct.anon.0, %struct.anon.1 }
+%struct.anon.0 = type { i32 }
+%struct.anon.1 = type { i32 }
+
+@i = common global i32 0, align 4
+@b = common global i32* null, align 8
+@c = common global i32 0, align 4
+@a = common global i32 0, align 4
+@h = common global i32 0, align 4
+@g = common global i32 0, align 4
+@j = common global i32 0, align 4
+@f = common global %struct.anon zeroinitializer, align 4
+@d = common global i32 0, align 4
+@e = common global i32 0, align 4
+
+; Function Attrs: norecurse nounwind
+define signext i32 @fn1(i32* nocapture %p1, i32 signext %p2, i32* nocapture %p3) {
+entry:
+  %0 = load i32, i32* @i, align 4, !tbaa !1
+  %cond = icmp eq i32 %0, 8
+  br i1 %cond, label %if.end16, label %while.cond.preheader
+
+while.cond.preheader:                             ; preds = %entry
+  %1 = load i32*, i32** @b, align 8, !tbaa !5
+  %2 = load i32, i32* %1, align 4, !tbaa !1
+  %tobool18 = icmp eq i32 %2, 0
+  br i1 %tobool18, label %while.end, label %while.body.lr.ph
+
+while.body.lr.ph:                                 ; preds = %while.cond.preheader
+  %.pre = load i32, i32* @c, align 4, !tbaa !1
+  br label %while.body
+
+while.body:                                       ; preds = %while.body.backedge, %while.body.lr.ph
+  switch i32 %.pre, label %while.body.backedge [
+    i32 0, label %sw.bb1
+    i32 8, label %sw.bb1
+    i32 6, label %sw.bb1
+    i32 24, label %while.cond.backedge
+  ]
+
+while.body.backedge:                              ; preds = %while.body, %while.cond.backedge
+  br label %while.body
+
+sw.bb1:                                           ; preds = %while.body, %while.body, %while.body
+  store i32 2, i32* @a, align 4, !tbaa !1
+  br label %while.cond.backedge
+
+while.cond.backedge:                              ; preds = %while.body, %sw.bb1
+  store i32 4, i32* @a, align 4, !tbaa !1
+  %.pre19 = load i32, i32* %1, align 4, !tbaa !1
+  %tobool = icmp eq i32 %.pre19, 0
+  br i1 %tobool, label %while.end.loopexit, label %while.body.backedge
+
+while.end.loopexit:                               ; preds = %while.cond.backedge
+  br label %while.end
+
+while.end:                                        ; preds = %while.end.loopexit, %while.cond.preheader
+  %3 = load i32, i32* @h, align 4, !tbaa !1
+  %mul = mul nsw i32 %0, %3
+  %4 = load i32, i32* @g, align 4, !tbaa !1
+  %mul4 = mul nsw i32 %mul, %4
+  store i32 %mul4, i32* @j, align 4, !tbaa !1
+  %5 = load i32, i32* getelementptr inbounds (%struct.anon, %struct.anon* @f, i64 0, i32 0, i32 0), align 4, !tbaa !7
+  %tobool5 = icmp eq i32 %5, 0
+  br i1 %tobool5, label %if.end, label %if.then
+
+if.then:                                          ; preds = %while.end
+  %div = sdiv i32 %5, %mul
+  store i32 %div, i32* @g, align 4, !tbaa !1
+  br label %if.end
+
+if.end:                                           ; preds = %while.end, %if.then
+  %6 = phi i32 [ %4, %while.end ], [ %div, %if.then ]
+  %7 = load i32, i32* getelementptr inbounds (%struct.anon, %struct.anon* @f, i64 0, i32 1, i32 0), align 4, !tbaa !10
+  %tobool7 = icmp ne i32 %7, 0
+  %tobool8 = icmp ne i32 %mul4, 0
+  %or.cond = and i1 %tobool7, %tobool8
+  %tobool10 = icmp ne i32 %0, 0
+  %or.cond17 = and i1 %or.cond, %tobool10
+  br i1 %or.cond17, label %if.then11, label %if.end13
+
+if.then11:                                        ; preds = %if.end
+  store i32 %3, i32* @d, align 4, !tbaa !1
+  %8 = load i32, i32* @e, align 4, !tbaa !1
+  store i32 %8, i32* %p3, align 4, !tbaa !1
+  %.pre20 = load i32, i32* @g, align 4, !tbaa !1
+  br label %if.end13
+
+if.end13:                                         ; preds = %if.then11, %if.end
+  %9 = phi i32 [ %.pre20, %if.then11 ], [ %6, %if.end ]
+  %tobool14 = icmp eq i32 %9, 0
+  br i1 %tobool14, label %if.end16, label %if.then15
+
+if.then15:                                        ; preds = %if.end13
+  store i32 %p2, i32* %p1, align 4, !tbaa !1
+  br label %if.end16
+
+if.end16:                                         ; preds = %entry, %if.end13, %if.then15
+  ret i32 2
+}
+
+; CHECK: mfcr {{[0-9]+}}
+
+!llvm.ident = !{!0}
+
+!0 = !{!"clang version 3.9.0 (trunk 261520)"}
+!1 = !{!2, !2, i64 0}
+!2 = !{!"int", !3, i64 0}
+!3 = !{!"omnipotent char", !4, i64 0}
+!4 = !{!"Simple C/C++ TBAA"}
+!5 = !{!6, !6, i64 0}
+!6 = !{!"any pointer", !3, i64 0}
+!7 = !{!8, !2, i64 0}
+!8 = !{!"", !9, i64 0, !9, i64 4}
+!9 = !{!"", !2, i64 0}
+!10 = !{!8, !2, i64 4}