X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=test%2FTransforms%2FInstCombine%2Fxor2.ll;h=d153e035c8996abc08de1826513672cd5e78a070;hb=b55dcfe47fbbcfc1dccd07cb27c02b9a86533d05;hp=89f00bd684757c12135f4cc6765376acdd0d733b;hpb=26c5663283f89f1624304723ebe8c25d253463a3;p=oota-llvm.git

diff --git a/test/Transforms/InstCombine/xor2.ll b/test/Transforms/InstCombine/xor2.ll
index 89f00bd6847..d153e035c89 100644
--- a/test/Transforms/InstCombine/xor2.ll
+++ b/test/Transforms/InstCombine/xor2.ll
@@ -4,7 +4,7 @@
 
 ; PR1253
 define i1 @test0(i32 %A) {
-; CHECK: @test0
+; CHECK-LABEL: @test0(
 ; CHECK: %C = icmp slt i32 %A, 0
 	%B = xor i32 %A, -2147483648
 	%C = icmp sgt i32 %B, -1
@@ -12,7 +12,7 @@ define i1 @test0(i32 %A) {
 }
 
 define i1 @test1(i32 %A) {
-; CHECK: @test1
+; CHECK-LABEL: @test1(
 ; CHECK: %C = icmp slt i32 %A, 0
 	%B = xor i32 %A, 12345
 	%C = icmp slt i32 %B, 0
@@ -21,7 +21,7 @@ define i1 @test1(i32 %A) {
 
 ; PR1014
 define i32 @test2(i32 %tmp1) {
-; CHECK:      @test2
+; CHECK-LABEL:      @test2(
 ; CHECK-NEXT:   and i32 %tmp1, 32
 ; CHECK-NEXT:   or i32 %ovm, 8 
 ; CHECK-NEXT:   ret i32
@@ -32,7 +32,7 @@ define i32 @test2(i32 %tmp1) {
 }
 
 define i32 @test3(i32 %tmp1) {
-; CHECK:      @test3
+; CHECK-LABEL:      @test3(
 ; CHECK-NEXT:   and i32 %tmp1, 32
 ; CHECK-NEXT:   or i32 %ovm, 8
 ; CHECK-NEXT:   ret i32
@@ -47,7 +47,38 @@ define i32 @test4(i32 %A, i32 %B) {
 	%2 = ashr i32 %1, %B
 	%3 = xor i32 %2, -1
 	ret i32 %3
-; CHECK: @test4
+; CHECK-LABEL: @test4(
 ; CHECK: %1 = ashr i32 %A, %B
 ; CHECK: ret i32 %1
 }
+
+; defect-2 in rdar://12329730
+; (X^C1) >> C2) ^ C3 -> (X>>C2) ^ ((C1>>C2)^C3)
+;   where the "X" has more than one use
+define i32 @test5(i32 %val1) {
+test5:
+  %xor = xor i32 %val1, 1234
+  %shr = lshr i32 %xor, 8
+  %xor1 = xor i32 %shr, 1
+  %add = add i32 %xor1, %xor
+  ret i32 %add
+; CHECK-LABEL: @test5(
+; CHECK: lshr i32 %val1, 8
+; CHECK: ret
+}
+
+; defect-1 in rdar://12329730
+; Simplify (X^Y) -> X or Y in the user's context if we know that 
+; only bits from X or Y are demanded.
+; e.g. the "x ^ 1234" can be optimized into x in the context of "t >> 16".
+;  Put in other word, t >> 16 -> x >> 16.
+; unsigned foo(unsigned x) { unsigned t = x ^ 1234; ;  return (t >> 16) + t;}
+define i32 @test6(i32 %x) {
+  %xor = xor i32 %x, 1234
+  %shr = lshr i32 %xor, 16
+  %add = add i32 %shr, %xor
+  ret i32 %add
+; CHECK-LABEL: @test6(
+; CHECK: lshr i32 %x, 16
+; CHECK: ret
+}