Revert "Remove an InstCombine that seems to have become redundant."

[oota-llvm.git] / test / Transforms / InstCombine / gepphigep.ll

diff --git a/test/Transforms/InstCombine/gepphigep.ll b/test/Transforms/InstCombine/gepphigep.ll
index 7cd22b9e34c86904b6b1c2917bb43ccb105a051a..5ae3171b39f61a368c0a7ad28676a51a443ee48d 100644 (file)
--- a/test/Transforms/InstCombine/gepphigep.ll
+++ b/test/Transforms/InstCombine/gepphigep.ll
@@ -8,7 +8,7 @@
 define i32 @test1(%struct1* %dm, i1 %tmp4, i64 %tmp9, i64 %tmp19) {
 bb:
   %tmp = getelementptr inbounds %struct1, %struct1* %dm, i64 0, i32 0
-  %tmp1 = load %struct2** %tmp, align 8
+  %tmp1 = load %struct2*, %struct2** %tmp, align 8
   br i1 %tmp4, label %bb1, label %bb2
 
 bb1:
@@ -26,7 +26,7 @@ bb2:
 bb3:
   %phi = phi %struct2* [ %tmp10, %bb1 ], [ %tmp20, %bb2 ]
   %tmp24 = getelementptr inbounds %struct2, %struct2* %phi, i64 0, i32 1
-  %tmp25 = load i32* %tmp24, align 4
+  %tmp25 = load i32, i32* %tmp24, align 4
   ret i32 %tmp25
 
 ; CHECK-LABEL: @test1(
@@ -40,7 +40,7 @@ bb3:
 define i32 @test2(%struct1* %dm, i1 %tmp4, i64 %tmp9, i64 %tmp19) {
 bb:
   %tmp = getelementptr inbounds %struct1, %struct1* %dm, i64 0, i32 0
-  %tmp1 = load %struct2** %tmp, align 8
+  %tmp1 = load %struct2*, %struct2** %tmp, align 8
   %tmp10 = getelementptr inbounds %struct2, %struct2* %tmp1, i64 %tmp9
   %tmp11 = getelementptr inbounds %struct2, %struct2* %tmp10, i64 0, i32 0
   store i32 0, i32* %tmp11, align 4
@@ -48,7 +48,7 @@ bb:
   %tmp21 = getelementptr inbounds %struct2, %struct2* %tmp20, i64 0, i32 0
   store i32 0, i32* %tmp21, align 4
   %tmp24 = getelementptr inbounds %struct2, %struct2* %tmp10, i64 0, i32 1
-  %tmp25 = load i32* %tmp24, align 4
+  %tmp25 = load i32, i32* %tmp24, align 4
   ret i32 %tmp25
 
 ; CHECK-LABEL: @test2(
@@ -87,7 +87,7 @@ bb5:
   %tmp27 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) catch i8* bitcast (i8** @_ZTIi to i8*)
   %tmp34 = getelementptr inbounds %struct4, %struct4* %phi, i64 %tmp21, i32 1
   %tmp35 = getelementptr inbounds %struct2, %struct2* %tmp34, i64 0, i32 1
-  %tmp25 = load i32* %tmp35, align 4
+  %tmp25 = load i32, i32* %tmp35, align 4
   ret i32 %tmp25
 
 ; CHECK-LABEL: @test3(
@@ -98,3 +98,39 @@ bb5:
 @_ZTIi = external constant i8*
 declare i32 @__gxx_personality_v0(...)
 declare i32 @foo1(i32)
+
+
+; Check that instcombine doesn't fold GEPs into themselves through a loop
+; back-edge.
+
+define i8* @test4(i32 %value, i8* %buffer) {
+entry:
+  %incptr = getelementptr inbounds i8, i8* %buffer, i64 1
+  %cmp = icmp ugt i32 %value, 127
+  br i1 %cmp, label %loop.header, label %exit
+
+loop.header:
+  br label %loop.body
+
+loop.body:
+  %loopptr = phi i8* [ %incptr, %loop.header ], [ %incptr2, %loop.body ]
+  %newval = phi i32 [ %value, %loop.header ], [ %shr, %loop.body ]
+  %shr = lshr i32 %newval, 7
+  %incptr2 = getelementptr inbounds i8, i8* %loopptr, i64 1
+  %cmp2 = icmp ugt i32 %shr, 127
+  br i1 %cmp2, label %loop.body, label %loop.exit
+
+loop.exit:
+  %exitptr = phi i8* [ %incptr2, %loop.body ]
+  br label %exit
+
+exit:
+  %ptr2 = phi i8* [ %exitptr, %loop.exit ], [ %incptr, %entry ]
+  %incptr3 = getelementptr inbounds i8, i8* %ptr2, i64 1
+  ret i8* %incptr3
+
+; CHECK-LABEL: @test4(
+; CHECK: loop.body:
+; CHECK: getelementptr{{.*}}i64 1
+; CHECK: exit:
+}