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80 lines
2.3 KiB
LLVM
80 lines
2.3 KiB
LLVM
; Tests to make sure elimination of casts is working correctly
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; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "p:32:32"
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; This shouldn't convert to getelementptr because the relationship
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; between the arithmetic and the layout of allocated memory is
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; entirely unknown.
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; CHECK: @test1
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; CHECK: ptrtoint
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; CHECK: add
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; CHECK: inttoptr
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define i8* @test1(i8* %t) {
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%tmpc = ptrtoint i8* %t to i32 ; <i32> [#uses=1]
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%tmpa = add i32 %tmpc, 32 ; <i32> [#uses=1]
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%tv = inttoptr i32 %tmpa to i8* ; <i8*> [#uses=1]
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ret i8* %tv
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}
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; These casts should be folded away.
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; CHECK: @test2
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; CHECK: icmp eq i8* %a, %b
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define i1 @test2(i8* %a, i8* %b) {
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%tmpa = ptrtoint i8* %a to i32 ; <i32> [#uses=1]
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%tmpb = ptrtoint i8* %b to i32 ; <i32> [#uses=1]
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%r = icmp eq i32 %tmpa, %tmpb ; <i1> [#uses=1]
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ret i1 %r
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}
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; These casts should also be folded away.
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; CHECK: @test3
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; CHECK: icmp eq i8* %a, @global
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@global = global i8 0
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define i1 @test3(i8* %a) {
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%tmpa = ptrtoint i8* %a to i32
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%r = icmp eq i32 %tmpa, ptrtoint (i8* @global to i32)
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ret i1 %r
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}
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define i1 @test4(i32 %A) {
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%B = inttoptr i32 %A to i8*
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%C = icmp eq i8* %B, null
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ret i1 %C
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; CHECK: @test4
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; CHECK-NEXT: %C = icmp eq i32 %A, 0
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; CHECK-NEXT: ret i1 %C
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}
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; Pulling the cast out of the load allows us to eliminate the load, and then
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; the whole array.
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%op = type { float }
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%unop = type { i32 }
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@Array = internal constant [1 x %op* (%op*)*] [ %op* (%op*)* @foo ] ; <[1 x %op* (%op*)*]*> [#uses=1]
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declare %op* @foo(%op* %X)
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define %unop* @test5(%op* %O) {
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%tmp = load %unop* (%op*)** bitcast ([1 x %op* (%op*)*]* @Array to %unop* (%op*)**); <%unop* (%op*)*> [#uses=1]
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%tmp.2 = call %unop* %tmp( %op* %O ) ; <%unop*> [#uses=1]
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ret %unop* %tmp.2
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; CHECK: @test5
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; CHECK: call %op* @foo(%op* %O)
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}
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; InstCombine can not 'load (cast P)' -> cast (load P)' if the cast changes
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; the address space.
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define i8 @test6(i8 addrspace(1)* %source) {
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entry:
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%arrayidx223 = bitcast i8 addrspace(1)* %source to i8*
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%tmp4 = load i8* %arrayidx223
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ret i8 %tmp4
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; CHECK: @test6
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; CHECK: load i8* %arrayidx223
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}
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