Address issues found by Duncan during post-commit review of r177856.

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

diff --git a/test/Transforms/InstCombine/cast_ptr.ll b/test/Transforms/InstCombine/cast_ptr.ll
index dce62af76694eca99f77275438b30ba84099b8e6..09910fbc848167538381a789588e1eb87ea00d94 100644 (file)
--- a/test/Transforms/InstCombine/cast_ptr.ll
+++ b/test/Transforms/InstCombine/cast_ptr.ll
@@ -1,21 +1,79 @@
 ; Tests to make sure elimination of casts is working correctly
-; RUN: llvm-upgrade < %s | llvm-as | opt -instcombine -disable-output &&
-; RUN: llvm-upgrade < %s | llvm-as | opt -instcombine | llvm-dis | not grep '\([sz]ext\)\|\(trunc\)|\(ptrtoint\)'
+; RUN: opt < %s -instcombine -S | FileCheck %s
 
-target pointersize = 32
+target datalayout = "p:32:32"
 
-implementation
+; This shouldn't convert to getelementptr because the relationship
+; between the arithmetic and the layout of allocated memory is
+; entirely unknown.
+; CHECK: @test1
+; CHECK: ptrtoint
+; CHECK: add
+; CHECK: inttoptr
+define i8* @test1(i8* %t) {
+        %tmpc = ptrtoint i8* %t to i32          ; <i32> [#uses=1]
+        %tmpa = add i32 %tmpc, 32               ; <i32> [#uses=1]
+        %tv = inttoptr i32 %tmpa to i8*         ; <i8*> [#uses=1]
+        ret i8* %tv
+}
+
+; These casts should be folded away.
+; CHECK: @test2
+; CHECK: icmp eq i8* %a, %b
+define i1 @test2(i8* %a, i8* %b) {
+        %tmpa = ptrtoint i8* %a to i32          ; <i32> [#uses=1]
+        %tmpb = ptrtoint i8* %b to i32          ; <i32> [#uses=1]
+        %r = icmp eq i32 %tmpa, %tmpb           ; <i1> [#uses=1]
+        ret i1 %r
+}
 
-sbyte* %test1(sbyte* %t) {
-       %tmpc = cast sbyte* %t to uint
-       %tmpa = add uint %tmpc, 32
-       %tv = cast uint %tmpa to sbyte*
-       ret sbyte* %tv
+; These casts should also be folded away.
+; CHECK: @test3
+; CHECK: icmp eq i8* %a, @global
+@global = global i8 0
+define i1 @test3(i8* %a) {
+        %tmpa = ptrtoint i8* %a to i32
+        %r = icmp eq i32 %tmpa, ptrtoint (i8* @global to i32)
+        ret i1 %r
 }
 
-bool %test2(sbyte* %a, sbyte* %b) {
-%tmpa = cast sbyte* %a to uint
-%tmpb = cast sbyte* %b to uint
-%r = seteq uint %tmpa, %tmpb
-ret bool %r
+define i1 @test4(i32 %A) {
+  %B = inttoptr i32 %A to i8*
+  %C = icmp eq i8* %B, null
+  ret i1 %C
+; CHECK: @test4
+; CHECK-NEXT: %C = icmp eq i32 %A, 0
+; CHECK-NEXT: ret i1 %C 
 }
+
+
+; Pulling the cast out of the load allows us to eliminate the load, and then 
+; the whole array.
+
+        %op = type { float }
+        %unop = type { i32 }
+@Array = internal constant [1 x %op* (%op*)*] [ %op* (%op*)* @foo ]             ; <[1 x %op* (%op*)*]*> [#uses=1]
+
+declare %op* @foo(%op* %X)
+
+define %unop* @test5(%op* %O) {
+        %tmp = load %unop* (%op*)** bitcast ([1 x %op* (%op*)*]* @Array to %unop* (%op*)**); <%unop* (%op*)*> [#uses=1]
+        %tmp.2 = call %unop* %tmp( %op* %O )            ; <%unop*> [#uses=1]
+        ret %unop* %tmp.2
+; CHECK: @test5
+; CHECK: call %op* @foo(%op* %O)
+}
+
+
+
+; InstCombine can not 'load (cast P)' -> cast (load P)' if the cast changes
+; the address space.
+
+define i8 @test6(i8 addrspace(1)* %source) {                                                                                        
+entry: 
+  %arrayidx223 = bitcast i8 addrspace(1)* %source to i8*
+  %tmp4 = load i8* %arrayidx223
+  ret i8 %tmp4
+; CHECK: @test6
+; CHECK: load i8* %arrayidx223
+}