Fix PR8702 by not having LoopSimplify claim to preserve LCSSA form. As described

in the PR, the pass could break LCSSA form when inserting preheaders. It probably would be easy enough to fix this, but since currently we always go into LCSSA form after running this pass, doing so is not urgent. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122695 91177308-0d34-0410-b5e6-96231b3b80d8
2026-04-25 05:22:04 +00:00 · 2011-01-02 13:38:21 +00:00
parent 86a582ddfb
commit 67fb341f8b
2 changed files with 55 additions and 15 deletions
@@ -0,0 +1,43 @@
+; RUN: opt < %s -loopsimplify -S
+; PR8702
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
+target triple = "x86_64-unknown-freebsd9.0"
+
+declare void @foo(i32 %x)
+
+define fastcc void @inm_merge() nounwind {
+entry:
+  br label %for.cond
+
+for.cond:                                         ; preds = %while.cond36.i, %entry
+  br i1 undef, label %do.body, label %for.body
+
+for.body:                                         ; preds = %for.cond
+  br i1 undef, label %while.cond36.i, label %if.end44
+
+if.end44:                                         ; preds = %for.body
+  %call49 = call fastcc i32 @inm_get_source()
+  br i1 undef, label %if.end54, label %for.cond64
+
+if.end54:                                         ; preds = %if.end44
+  br label %while.cond36.i
+
+while.cond36.i:                                   ; preds = %if.end54, %for.body
+  br label %for.cond
+
+for.cond64:                                       ; preds = %if.end88, %for.cond64, %if.end44
+  %error.161 = phi i32 [ %error.161, %for.cond64 ], [ %error.161, %if.end88 ], [ %call49, %if.end44 ]
+  call void @foo(i32 %error.161)
+  br i1 undef, label %for.cond64, label %if.end88
+
+if.end88:                                         ; preds = %for.cond64
+  br i1 undef, label %for.cond64, label %if.end98
+
+if.end98:                                         ; preds = %if.end88
+  unreachable
+
+do.body:                                          ; preds = %for.cond
+  unreachable
+}
+
+declare fastcc i32 @inm_get_source() nounwind