Add dominance check for the instruction being hoisted.

For example, MachineLICM should not hoist a load that is not guaranteed to be executed.
Radar 10254254.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141689 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 36 insertions, 0 deletions

diff --git a/test/CodeGen/X86/licm-dominance.ll b/test/CodeGen/X86/licm-dominance.ll
new file mode 100644
index 0000000000..8a0958db0e
--- /dev/null
+++ b/test/CodeGen/X86/licm-dominance.ll
@@ -0,0 +1,36 @@
+; RUN: llc -asm-verbose=false < %s | FileCheck %s
+
+; MachineLICM should check dominance before hoisting instructions.
+; CHECK:	jne	LBB0_3
+; CHECK-NEXT:	xorb	%al, %al
+; CHECK-NEXT:	testb	%al, %al
+
+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-apple-macosx10.7.2"
+
+define void @CMSColorWorldCreateParametricData() nounwind uwtable optsize ssp {
+entry:
+  br label %for.body.i
+
+for.body.i:                                       
+  br i1 undef, label %for.inc.i, label %if.then26.i
+
+if.then26.i:                                      
+  br i1 undef, label %if.else.i.i, label %lor.lhs.false.i.i
+
+if.else.i.i:                                      
+  br i1 undef, label %lor.lhs.false.i.i, label %if.then116.i.i
+
+lor.lhs.false.i.i:                                
+  br i1 undef, label %for.inc.i, label %if.then116.i.i
+
+if.then116.i.i:                                   
+  unreachable
+
+for.inc.i:                                        
+  %cmp17.i = icmp ult i64 undef, undef
+  br i1 %cmp17.i, label %for.body.i, label %if.end28.i
+
+if.end28.i:                                       
+  ret void
+}