X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=test%2FTransforms%2FInstCombine%2Fdiv.ll;h=f67fd1c51be3d4691d9bcd665ae4e0d322c62f4d;hb=b55dcfe47fbbcfc1dccd07cb27c02b9a86533d05;hp=ea6ea6323c5645768f4612dd0980993c81f2ac44;hpb=b2ae9e34db381a38bc6bdd2334f471130e38a984;p=oota-llvm.git

diff --git a/test/Transforms/InstCombine/div.ll b/test/Transforms/InstCombine/div.ll
index ea6ea6323c5..f67fd1c51be 100644
--- a/test/Transforms/InstCombine/div.ll
+++ b/test/Transforms/InstCombine/div.ll
@@ -1,34 +1,44 @@
 ; This test makes sure that div instructions are properly eliminated.
 
-; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep div
+; RUN: opt < %s -instcombine -S | FileCheck %s
 
 define i32 @test1(i32 %A) {
         %B = sdiv i32 %A, 1             ; <i32> [#uses=1]
         ret i32 %B
+; CHECK-LABEL: @test1(
+; CHECK-NEXT: ret i32 %A
 }
 
 define i32 @test2(i32 %A) {
         ; => Shift
         %B = udiv i32 %A, 8             ; <i32> [#uses=1]
         ret i32 %B
+; CHECK-LABEL: @test2(
+; CHECK-NEXT: lshr i32 %A, 3
 }
 
 define i32 @test3(i32 %A) {
         ; => 0, don't need to keep traps
         %B = sdiv i32 0, %A             ; <i32> [#uses=1]
         ret i32 %B
+; CHECK-LABEL: @test3(
+; CHECK-NEXT: ret i32 0
 }
 
 define i32 @test4(i32 %A) {
         ; 0-A
         %B = sdiv i32 %A, -1            ; <i32> [#uses=1]
         ret i32 %B
+; CHECK-LABEL: @test4(
+; CHECK-NEXT: sub i32 0, %A
 }
 
 define i32 @test5(i32 %A) {
         %B = udiv i32 %A, -16           ; <i32> [#uses=1]
         %C = udiv i32 %B, -4            ; <i32> [#uses=1]
         ret i32 %C
+; CHECK-LABEL: @test5(
+; CHECK-NEXT: ret i32 0
 }
 
 define i1 @test6(i32 %A) {
@@ -36,6 +46,8 @@ define i1 @test6(i32 %A) {
         ; A < 123
         %C = icmp eq i32 %B, 0          ; <i1> [#uses=1]
         ret i1 %C
+; CHECK-LABEL: @test6(
+; CHECK-NEXT: icmp ult i32 %A, 123
 }
 
 define i1 @test7(i32 %A) {
@@ -43,6 +55,9 @@ define i1 @test7(i32 %A) {
         ; A >= 20 && A < 30
         %C = icmp eq i32 %B, 2          ; <i1> [#uses=1]
         ret i1 %C
+; CHECK-LABEL: @test7(
+; CHECK-NEXT: add i32 %A, -20
+; CHECK-NEXT: icmp ult i32
 }
 
 define i1 @test8(i8 %A) {
@@ -50,6 +65,8 @@ define i1 @test8(i8 %A) {
         ; A >= 246
         %C = icmp eq i8 %B, 2           ; <i1> [#uses=1]
         ret i1 %C
+; CHECK-LABEL: @test8(
+; CHECK-NEXT: icmp ugt i8 %A, -11
 }
 
 define i1 @test9(i8 %A) {
@@ -57,28 +74,61 @@ define i1 @test9(i8 %A) {
         ; A < 246
         %C = icmp ne i8 %B, 2           ; <i1> [#uses=1]
         ret i1 %C
+; CHECK-LABEL: @test9(
+; CHECK-NEXT: icmp ult i8 %A, -10
 }
 
 define i32 @test10(i32 %X, i1 %C) {
         %V = select i1 %C, i32 64, i32 8                ; <i32> [#uses=1]
         %R = udiv i32 %X, %V            ; <i32> [#uses=1]
         ret i32 %R
+; CHECK-LABEL: @test10(
+; CHECK-NEXT: select i1 %C, i32 6, i32 3
+; CHECK-NEXT: lshr i32 %X
 }
 
 define i32 @test11(i32 %X, i1 %C) {
         %A = select i1 %C, i32 1024, i32 32             ; <i32> [#uses=1]
         %B = udiv i32 %X, %A            ; <i32> [#uses=1]
         ret i32 %B
+; CHECK-LABEL: @test11(
+; CHECK-NEXT: select i1 %C, i32 10, i32 5
+; CHECK-NEXT: lshr i32 %X
 }
 
 ; PR2328
 define i32 @test12(i32 %x) nounwind  {
 	%tmp3 = udiv i32 %x, %x		; 1
 	ret i32 %tmp3
+; CHECK-LABEL: @test12(
+; CHECK-NEXT: ret i32 1
 }
 
 define i32 @test13(i32 %x) nounwind  {
 	%tmp3 = sdiv i32 %x, %x		; 1
 	ret i32 %tmp3
+; CHECK-LABEL: @test13(
+; CHECK-NEXT: ret i32 1
 }
 
+define i32 @test14(i8 %x) nounwind {
+	%zext = zext i8 %x to i32
+	%div = udiv i32 %zext, 257	; 0
+	ret i32 %div
+; CHECK-LABEL: @test14(
+; CHECK-NEXT: ret i32 0
+}
+
+; PR9814
+define i32 @test15(i32 %a, i32 %b) nounwind {
+  %shl = shl i32 1, %b
+  %div = lshr i32 %shl, 2
+  %div2 = udiv i32 %a, %div
+  ret i32 %div2
+; CHECK-LABEL: @test15(
+; CHECK-NEXT: add i32 %b, -2
+; CHECK-NEXT: lshr i32 %a, 
+; CHECK-NEXT: ret i32
+}
+
+