-; RUN: opt %s -instcombine -S | FileCheck %s
-; XFAIL: *
+; RUN: opt -instcombine -S < %s | FileCheck %s
; PR5438
; TODO: This should also optimize down.
-;define i32 @bar(i32 %a, i32 %b) nounwind readnone {
+;define i32 @test1(i32 %a, i32 %b) nounwind readnone {
;entry:
; %0 = icmp sgt i32 %a, -1 ; <i1> [#uses=1]
; %1 = icmp slt i32 %b, 0 ; <i1> [#uses=1]
; ret i32 %3
;}
-define i32 @qaz(i32 %a, i32 %b) nounwind readnone {
-; CHECK: @qaz
+; TODO: This optimizes partially but not all the way.
+;define i32 @test2(i32 %a, i32 %b) nounwind readnone {
+;entry:
+; %0 = and i32 %a, 8 ;<i32> [#uses=1]
+; %1 = and i32 %b, 8 ;<i32> [#uses=1]
+; %2 = icmp eq i32 %0, %1 ;<i1> [#uses=1]
+; %3 = zext i1 %2 to i32 ;<i32> [#uses=1]
+; ret i32 %3
+;}
+
+define i32 @test3(i32 %a, i32 %b) nounwind readnone {
+; CHECK: @test3
entry:
; CHECK: xor i32 %a, %b
-; CHECK; lshr i32 %0, 31
+; CHECK: lshr i32 %0, 31
; CHECK: xor i32 %1, 1
%0 = lshr i32 %a, 31 ; <i32> [#uses=1]
%1 = lshr i32 %b, 31 ; <i32> [#uses=1]
; CHECK-NOT: zext
; CHECK: ret i32 %2
}
+
+; Variation on @test3: checking the 2nd bit in a situation where the 5th bit
+; is one, not zero.
+define i32 @test3i(i32 %a, i32 %b) nounwind readnone {
+; CHECK: @test3i
+entry:
+; CHECK: xor i32 %a, %b
+; CHECK: lshr i32 %0, 31
+; CHECK: xor i32 %1, 1
+ %0 = lshr i32 %a, 29 ; <i32> [#uses=1]
+ %1 = lshr i32 %b, 29 ; <i32> [#uses=1]
+ %2 = or i32 %0, 35
+ %3 = or i32 %1, 35
+ %4 = icmp eq i32 %2, %3 ; <i1> [#uses=1]
+ %5 = zext i1 %4 to i32 ; <i32> [#uses=1]
+ ret i32 %5
+; CHECK-NOT: icmp
+; CHECK-NOT: zext
+; CHECK: ret i32 %2
+}