fix PR4767, a crash because fp stackifier visited blocks in
depth first order, so it wouldn't process unreachable blocks.
When compiling at -O0, late dead block elimination isn't done
and the bad instructions got to isel.
llvm-svn: 81187
diff --git a/llvm/test/CodeGen/X86/fp-stack-O0-crash.ll b/llvm/test/CodeGen/X86/fp-stack-O0-crash.ll
new file mode 100644
index 0000000..4768ea2
--- /dev/null
+++ b/llvm/test/CodeGen/X86/fp-stack-O0-crash.ll
@@ -0,0 +1,30 @@
+; RUN: llc %s -O0 -fast-isel -regalloc=local -o -
+; PR4767
+
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
+target triple = "i386-apple-darwin10"
+
+define void @fn(x86_fp80 %x) nounwind ssp {
+entry:
+ %x.addr = alloca x86_fp80 ; <x86_fp80*> [#uses=5]
+ store x86_fp80 %x, x86_fp80* %x.addr
+ br i1 false, label %cond.true, label %cond.false
+
+cond.true: ; preds = %entry
+ %tmp = load x86_fp80* %x.addr ; <x86_fp80> [#uses=1]
+ %tmp1 = load x86_fp80* %x.addr ; <x86_fp80> [#uses=1]
+ %cmp = fcmp oeq x86_fp80 %tmp, %tmp1 ; <i1> [#uses=1]
+ br i1 %cmp, label %if.then, label %if.end
+
+cond.false: ; preds = %entry
+ %tmp2 = load x86_fp80* %x.addr ; <x86_fp80> [#uses=1]
+ %tmp3 = load x86_fp80* %x.addr ; <x86_fp80> [#uses=1]
+ %cmp4 = fcmp une x86_fp80 %tmp2, %tmp3 ; <i1> [#uses=1]
+ br i1 %cmp4, label %if.then, label %if.end
+
+if.then: ; preds = %cond.false, %cond.true
+ br label %if.end
+
+if.end: ; preds = %if.then, %cond.false, %cond.true
+ ret void
+}