5afbfe33e7
We can fold an equality or unsigned icmp between base+offset1 and base+offset2 with inbounds offsets by comparing the offsets directly. This replaces a pair of specialized folds that tried to reason based on the GEP structure instead. One of those folds was plain wrong (because it does not account for negative offsets), while the other is unnecessarily complicated and limited (e.g. it will fail with bitcasts involved). The disadvantage of this change is that it requires data layout, so the fold is no longer performed by datalayout-independent constant folding. I don't think this is a loss in practice, but it does regress the ConstantExprFold.ll test, which checks folding without running any passes. Differential Revision: https://reviews.llvm.org/D116332
70 lines
3.5 KiB
LLVM
70 lines
3.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals
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; This test checks to make sure that constant exprs fold in some simple
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; situations
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; RUN: opt -S < %s | FileCheck %s
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; RUN: llvm-as < %s | llvm-dis | FileCheck %s
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; RUN: verify-uselistorder %s
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@A = global i64 0
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@0 = global i64* inttoptr (i64 add (i64 ptrtoint (i64* @A to i64), i64 0) to i64*) ; X + 0 == X
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@1 = global i64* inttoptr (i64 sub (i64 ptrtoint (i64* @A to i64), i64 0) to i64*) ; X - 0 == X
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@2 = global i64* inttoptr (i64 mul (i64 ptrtoint (i64* @A to i64), i64 0) to i64*) ; X * 0 == 0
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@3 = global i64* inttoptr (i64 sdiv (i64 ptrtoint (i64* @A to i64), i64 1) to i64*) ; X / 1 == X
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@4 = global i64* inttoptr (i64 srem (i64 ptrtoint (i64* @A to i64), i64 1) to i64*) ; X % 1 == 0
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@5 = global i64* inttoptr (i64 and (i64 ptrtoint (i64* @A to i64), i64 0) to i64*) ; X & 0 == 0
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@6 = global i64* inttoptr (i64 and (i64 ptrtoint (i64* @A to i64), i64 -1) to i64*) ; X & -1 == X
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@7 = global i64 or (i64 ptrtoint (i64* @A to i64), i64 -1) ; X | -1 == -1
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@8 = global i64* inttoptr (i64 xor (i64 ptrtoint (i64* @A to i64), i64 0) to i64*) ; X ^ 0 == X
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%Ty = type { i32, i32 }
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@B = external global %Ty
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; @9 and @11 will be folded by the target-dependent constant folder instead.
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@9 = global i1 icmp ult (i64* @A, i64* getelementptr (i64, i64* @A, i64 1)) ; true
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@10 = global i1 icmp slt (i64* @A, i64* getelementptr (i64, i64* @A, i64 0)) ; false
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@11 = global i1 icmp ult (i32* getelementptr (%Ty, %Ty* @B, i64 0, i32 0),
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i32* getelementptr (%Ty, %Ty* @B, i64 0, i32 1)) ; true
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;global i1 icmp ne (i64* @A, i64* bitcast (%Ty* @B to i64*)) ; true
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; PR2206
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@cons = weak global i32 0, align 8 ; <i32*> [#uses=1]
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@12 = global i64 and (i64 ptrtoint (i32* @cons to i64), i64 7)
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@13 = global <2 x i8*> getelementptr(i8, <2 x i8*> undef, <2 x i64> <i64 1, i64 1>)
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@14 = global <2 x i8*> getelementptr({ i8 }, <2 x { i8 }*> undef, <2 x i64> <i64 1, i64 1>, <2 x i32> <i32 0, i32 0>)
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@15 = global <2 x i8*> getelementptr(i8, <2 x i8*> zeroinitializer, <2 x i64> <i64 0, i64 0>)
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@16 = global <2 x i8*> getelementptr({ i8 }, <2 x { i8 }*> zeroinitializer, <2 x i64> <i64 0, i64 0>, <2 x i32> <i32 0, i32 0>)
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; Need a function to make update_test_checks.py work.
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;.
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; CHECK: @[[A:[a-zA-Z0-9_$"\\.-]+]] = global i64 0
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; CHECK: @[[GLOB0:[0-9]+]] = global i64* @A
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; CHECK: @[[GLOB1:[0-9]+]] = global i64* @A
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; CHECK: @[[GLOB2:[0-9]+]] = global i64* null
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; CHECK: @[[GLOB3:[0-9]+]] = global i64* @A
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; CHECK: @[[GLOB4:[0-9]+]] = global i64* null
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; CHECK: @[[GLOB5:[0-9]+]] = global i64* null
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; CHECK: @[[GLOB6:[0-9]+]] = global i64* @A
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; CHECK: @[[GLOB7:[0-9]+]] = global i64 -1
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; CHECK: @[[GLOB8:[0-9]+]] = global i64* @A
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; CHECK: @[[B:[a-zA-Z0-9_$"\\.-]+]] = external global [[TY:%.*]]
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; CHECK: @[[GLOB9:[0-9]+]] = global i1 icmp ugt (i64* getelementptr inbounds (i64, i64* @A, i64 1), i64* @A)
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; CHECK: @[[GLOB10:[0-9]+]] = global i1 false
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; CHECK: @[[GLOB11:[0-9]+]] = global i1 icmp ult (i32* getelementptr inbounds ([[TY:%.*]], %Ty* @B, i64 0, i32 0), i32* getelementptr inbounds ([[TY]], %Ty* @B, i64 0, i32 1))
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; CHECK: @[[CONS:[a-zA-Z0-9_$"\\.-]+]] = weak global i32 0, align 8
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; CHECK: @[[GLOB12:[0-9]+]] = global i64 0
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; CHECK: @[[GLOB13:[0-9]+]] = global <2 x i8*> undef
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; CHECK: @[[GLOB14:[0-9]+]] = global <2 x i8*> undef
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; CHECK: @[[GLOB15:[0-9]+]] = global <2 x i8*> zeroinitializer
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; CHECK: @[[GLOB16:[0-9]+]] = global <2 x i8*> zeroinitializer
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;.
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define void @dummy() {
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; CHECK-LABEL: @dummy(
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; CHECK-NEXT: ret void
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;
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ret void
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}
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