1 ; Tests to make sure elimination of casts is working correctly 2 ; RUN: opt < %s -instcombine -S | FileCheck %s 3 4 target datalayout = "p:32:32" 5 6 ; This shouldn't convert to getelementptr because the relationship 7 ; between the arithmetic and the layout of allocated memory is 8 ; entirely unknown. 9 ; CHECK-LABEL: @test1( 10 ; CHECK: ptrtoint 11 ; CHECK: add 12 ; CHECK: inttoptr 13 define i8* @test1(i8* %t) { 14 %tmpc = ptrtoint i8* %t to i32 ; <i32> [#uses=1] 15 %tmpa = add i32 %tmpc, 32 ; <i32> [#uses=1] 16 %tv = inttoptr i32 %tmpa to i8* ; <i8*> [#uses=1] 17 ret i8* %tv 18 } 19 20 ; These casts should be folded away. 21 ; CHECK-LABEL: @test2( 22 ; CHECK: icmp eq i8* %a, %b 23 define i1 @test2(i8* %a, i8* %b) { 24 %tmpa = ptrtoint i8* %a to i32 ; <i32> [#uses=1] 25 %tmpb = ptrtoint i8* %b to i32 ; <i32> [#uses=1] 26 %r = icmp eq i32 %tmpa, %tmpb ; <i1> [#uses=1] 27 ret i1 %r 28 } 29 30 ; These casts should also be folded away. 31 ; CHECK-LABEL: @test3( 32 ; CHECK: icmp eq i8* %a, @global 33 @global = global i8 0 34 define i1 @test3(i8* %a) { 35 %tmpa = ptrtoint i8* %a to i32 36 %r = icmp eq i32 %tmpa, ptrtoint (i8* @global to i32) 37 ret i1 %r 38 } 39 40 define i1 @test4(i32 %A) { 41 %B = inttoptr i32 %A to i8* 42 %C = icmp eq i8* %B, null 43 ret i1 %C 44 ; CHECK-LABEL: @test4( 45 ; CHECK-NEXT: %C = icmp eq i32 %A, 0 46 ; CHECK-NEXT: ret i1 %C 47 } 48 49 50 ; Pulling the cast out of the load allows us to eliminate the load, and then 51 ; the whole array. 52 53 %op = type { float } 54 %unop = type { i32 } 55 @Array = internal constant [1 x %op* (%op*)*] [ %op* (%op*)* @foo ] ; <[1 x %op* (%op*)*]*> [#uses=1] 56 57 declare %op* @foo(%op* %X) 58 59 define %unop* @test5(%op* %O) { 60 %tmp = load %unop* (%op*)** bitcast ([1 x %op* (%op*)*]* @Array to %unop* (%op*)**); <%unop* (%op*)*> [#uses=1] 61 %tmp.2 = call %unop* %tmp( %op* %O ) ; <%unop*> [#uses=1] 62 ret %unop* %tmp.2 63 ; CHECK-LABEL: @test5( 64 ; CHECK: call %op* @foo(%op* %O) 65 } 66 67 68 69 ; InstCombine can not 'load (cast P)' -> cast (load P)' if the cast changes 70 ; the address space. 71 72 define i8 @test6(i8 addrspace(1)* %source) { 73 entry: 74 %arrayidx223 = bitcast i8 addrspace(1)* %source to i8* 75 %tmp4 = load i8* %arrayidx223 76 ret i8 %tmp4 77 ; CHECK-LABEL: @test6( 78 ; CHECK: load i8* %arrayidx223 79 } 80
