237 lines
8.8 KiB
LLVM
237 lines
8.8 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -dse -enable-dse-partial-store-merging -S < %s | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-f128:128:128-n8:16:32:64"
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define void @byte_by_byte_replacement(i32 *%ptr) {
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; CHECK-LABEL: @byte_by_byte_replacement(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i32 202050057, i32* [[PTR:%.*]]
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; CHECK-NEXT: ret void
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;
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entry:
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;; This store's value should be modified as it should be better to use one
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;; larger store than several smaller ones.
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;; store will turn into 0x0C0B0A09 == 202050057
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store i32 305419896, i32* %ptr ; 0x12345678
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%bptr = bitcast i32* %ptr to i8*
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%bptr1 = getelementptr inbounds i8, i8* %bptr, i64 1
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%bptr2 = getelementptr inbounds i8, i8* %bptr, i64 2
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%bptr3 = getelementptr inbounds i8, i8* %bptr, i64 3
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;; We should be able to merge these four stores with the i32 above
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; value (and bytes) stored before ; 0x12345678
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store i8 9, i8* %bptr ; 09
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store i8 10, i8* %bptr1 ; 0A
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store i8 11, i8* %bptr2 ; 0B
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store i8 12, i8* %bptr3 ; 0C
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; 0x0C0B0A09
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ret void
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}
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define void @word_replacement(i64 *%ptr) {
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; CHECK-LABEL: @word_replacement(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i64 8106482645252179720, i64* [[PTR:%.*]]
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; CHECK-NEXT: ret void
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;
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entry:
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store i64 72623859790382856, i64* %ptr ; 0x0102030405060708
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%wptr = bitcast i64* %ptr to i16*
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%wptr1 = getelementptr inbounds i16, i16* %wptr, i64 1
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%wptr3 = getelementptr inbounds i16, i16* %wptr, i64 3
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;; We should be able to merge these two stores with the i64 one above
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; value (not bytes) stored before ; 0x0102030405060708
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store i16 4128, i16* %wptr1 ; 1020
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store i16 28800, i16* %wptr3 ; 7080
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; 0x7080030410200708
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ret void
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}
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define void @differently_sized_replacements(i64 *%ptr) {
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; CHECK-LABEL: @differently_sized_replacements(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i64 578437695752307201, i64* [[PTR:%.*]]
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; CHECK-NEXT: ret void
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;
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entry:
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store i64 579005069656919567, i64* %ptr ; 0x08090a0b0c0d0e0f
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%bptr = bitcast i64* %ptr to i8*
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%bptr6 = getelementptr inbounds i8, i8* %bptr, i64 6
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%wptr = bitcast i64* %ptr to i16*
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%wptr2 = getelementptr inbounds i16, i16* %wptr, i64 2
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%dptr = bitcast i64* %ptr to i32*
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;; We should be able to merge all these stores with the i64 one above
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; value (not bytes) stored before ; 0x08090a0b0c0d0e0f
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store i8 7, i8* %bptr6 ; 07
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store i16 1541, i16* %wptr2 ; 0605
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store i32 67305985, i32* %dptr ; 04030201
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; 0x0807060504030201
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ret void
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}
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define void @multiple_replacements_to_same_byte(i64 *%ptr) {
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; CHECK-LABEL: @multiple_replacements_to_same_byte(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i64 579005069522043393, i64* [[PTR:%.*]]
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; CHECK-NEXT: ret void
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;
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entry:
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store i64 579005069656919567, i64* %ptr ; 0x08090a0b0c0d0e0f
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%bptr = bitcast i64* %ptr to i8*
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%bptr3 = getelementptr inbounds i8, i8* %bptr, i64 3
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%wptr = bitcast i64* %ptr to i16*
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%wptr1 = getelementptr inbounds i16, i16* %wptr, i64 1
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%dptr = bitcast i64* %ptr to i32*
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;; We should be able to merge all these stores with the i64 one above
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; value (not bytes) stored before ; 0x08090a0b0c0d0e0f
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store i8 7, i8* %bptr3 ; 07
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store i16 1541, i16* %wptr1 ; 0605
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store i32 67305985, i32* %dptr ; 04030201
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; 0x08090a0b04030201
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ret void
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}
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define void @merged_merges(i64 *%ptr) {
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; CHECK-LABEL: @merged_merges(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i64 579005069572506113, i64* [[PTR:%.*]]
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; CHECK-NEXT: ret void
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;
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entry:
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store i64 579005069656919567, i64* %ptr ; 0x08090a0b0c0d0e0f
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%bptr = bitcast i64* %ptr to i8*
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%bptr3 = getelementptr inbounds i8, i8* %bptr, i64 3
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%wptr = bitcast i64* %ptr to i16*
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%wptr1 = getelementptr inbounds i16, i16* %wptr, i64 1
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%dptr = bitcast i64* %ptr to i32*
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;; We should be able to merge all these stores with the i64 one above
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; value (not bytes) stored before ; 0x08090a0b0c0d0e0f
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store i32 67305985, i32* %dptr ; 04030201
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store i16 1541, i16* %wptr1 ; 0605
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store i8 7, i8* %bptr3 ; 07
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; 0x08090a0b07050201
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ret void
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}
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define signext i8 @shouldnt_merge_since_theres_a_full_overlap(i64 *%ptr) {
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; CHECK-LABEL: @shouldnt_merge_since_theres_a_full_overlap(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[BPTR:%.*]] = bitcast i64* [[PTR:%.*]] to i8*
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; CHECK-NEXT: [[BPTRM1:%.*]] = getelementptr inbounds i8, i8* [[BPTR]], i64 -1
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; CHECK-NEXT: [[BPTR3:%.*]] = getelementptr inbounds i8, i8* [[BPTR]], i64 3
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; CHECK-NEXT: [[DPTR:%.*]] = bitcast i8* [[BPTRM1]] to i32*
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; CHECK-NEXT: [[QPTR:%.*]] = bitcast i8* [[BPTR3]] to i64*
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; CHECK-NEXT: store i32 1234, i32* [[DPTR]], align 1
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; CHECK-NEXT: store i64 5678, i64* [[QPTR]], align 1
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; CHECK-NEXT: ret i8 0
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;
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entry:
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; Also check that alias.scope metadata doesn't get dropped
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store i64 0, i64* %ptr, !alias.scope !32
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%bptr = bitcast i64* %ptr to i8*
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%bptrm1 = getelementptr inbounds i8, i8* %bptr, i64 -1
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%bptr3 = getelementptr inbounds i8, i8* %bptr, i64 3
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%dptr = bitcast i8* %bptrm1 to i32*
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%qptr = bitcast i8* %bptr3 to i64*
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store i32 1234, i32* %dptr, align 1
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store i64 5678, i64* %qptr, align 1
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ret i8 0
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}
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;; Test case from PR31777
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%union.U = type { i64 }
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define void @foo(%union.U* nocapture %u) {
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; CHECK-LABEL: @foo(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[I:%.*]] = getelementptr inbounds [[UNION_U:%.*]], %union.U* [[U:%.*]], i64 0, i32 0
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; CHECK-NEXT: store i64 42, i64* [[I]], align 8
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; CHECK-NEXT: ret void
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;
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entry:
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%i = getelementptr inbounds %union.U, %union.U* %u, i64 0, i32 0
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store i64 0, i64* %i, align 8, !dbg !22, !tbaa !26, !noalias !30, !nontemporal !29
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%s = bitcast %union.U* %u to i16*
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store i16 42, i16* %s, align 8
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ret void
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}
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; Don't crash by operating on stale data if we merge (kill) the last 2 stores.
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define void @PR34074(i32* %x, i64* %y) {
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; CHECK-LABEL: @PR34074(
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; CHECK-NEXT: store i64 42, i64* %y
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; CHECK-NEXT: store i32 4, i32* %x
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; CHECK-NEXT: ret void
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;
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store i64 42, i64* %y ; independent store
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%xbc = bitcast i32* %x to i8*
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store i32 0, i32* %x ; big store of constant
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store i8 4, i8* %xbc ; small store with mergeable constant
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ret void
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}
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; We can't eliminate the last store because P and Q may alias.
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define void @PR36129(i32* %P, i32* %Q) {
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; CHECK-LABEL: @PR36129(
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; CHECK-NEXT: store i32 1, i32* [[P:%.*]], align 4
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; CHECK-NEXT: [[P2:%.*]] = bitcast i32* [[P]] to i8*
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; CHECK-NEXT: store i32 2, i32* [[Q:%.*]], align 4
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; CHECK-NEXT: store i8 3, i8* [[P2]], align 1
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; CHECK-NEXT: ret void
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;
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store i32 1, i32* %P, align 4
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%P2 = bitcast i32* %P to i8*
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store i32 2, i32* %Q, align 4
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store i8 3, i8* %P2, align 1
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ret void
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}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 5.0.0 (trunk 306512)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "me.cpp", directory: "/compiler-explorer")
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!2 = !{}
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!7 = distinct !DISubprogram(name: "foo", linkageName: "foo(U*)", scope: !1, file: !1, line: 9, type: !8, isLocal: false, isDefinition: true, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !20)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null, !10}
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!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)
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!11 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "U", file: !1, line: 4, size: 64, elements: !12, identifier: "typeinfo name for U")
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!12 = !{!13, !17}
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !11, file: !1, line: 5, baseType: !14, size: 64)
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!14 = !DIDerivedType(tag: DW_TAG_typedef, name: "uint64_t", file: !15, line: 55, baseType: !16)
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!15 = !DIFile(filename: "/usr/include/stdint.h", directory: "/compiler-explorer")
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!16 = !DIBasicType(name: "long unsigned int", size: 64, encoding: DW_ATE_unsigned)
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!17 = !DIDerivedType(tag: DW_TAG_member, name: "s", scope: !11, file: !1, line: 6, baseType: !18, size: 16)
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!18 = !DIDerivedType(tag: DW_TAG_typedef, name: "uint16_t", file: !15, line: 49, baseType: !19)
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!19 = !DIBasicType(name: "unsigned short", size: 16, encoding: DW_ATE_unsigned)
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!20 = !{!21}
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!21 = !DILocalVariable(name: "u", arg: 1, scope: !7, file: !1, line: 9, type: !10)
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!22 = !DILocation(line: 10, column: 8, scope: !7)
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!26 = !{!27, !27, i64 0}
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!27 = !{!"omnipotent char", !28, i64 0}
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!28 = !{!"Simple C++ TBAA"}
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!29 = !{i32 1}
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; Domains and scopes which might alias
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!30 = !{!30}
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!31 = !{!31, !30}
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!32 = !{!32}
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!33 = !{!33, !32}
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