diff --git a/llvm/lib/Transforms/Utils/LoopUnroll.cpp b/llvm/lib/Transforms/Utils/LoopUnroll.cpp --- a/llvm/lib/Transforms/Utils/LoopUnroll.cpp +++ b/llvm/lib/Transforms/Utils/LoopUnroll.cpp @@ -220,10 +220,10 @@ } } - // At this point, the code is well formed. We now do a quick sweep over the - // inserted code, doing constant propagation and dead code elimination as we - // go. + // At this point, the code is well formed. Perform constprop, instsimplify, + // and dce. const DataLayout &DL = L->getHeader()->getModule()->getDataLayout(); + SmallVector DeadInsts; for (BasicBlock *BB : L->getBlocks()) { for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E;) { Instruction *Inst = &*I++; @@ -232,14 +232,15 @@ if (LI->replacementPreservesLCSSAForm(Inst, V)) Inst->replaceAllUsesWith(V); if (isInstructionTriviallyDead(Inst)) - BB->getInstList().erase(Inst); + DeadInsts.emplace_back(Inst); } } - // TODO: after peeling or unrolling, previously loop variant conditions are - // likely to fold to constants, eagerly propagating those here will require - // fewer cleanup passes to be run. Alternatively, a LoopEarlyCSE might be - // appropriate. + while (!DeadInsts.empty()) { + Value *V = DeadInsts.pop_back_val(); + if (Instruction *Inst = dyn_cast_or_null(V)) + RecursivelyDeleteTriviallyDeadInstructions(Inst); + } } /// Unroll the given loop by Count. The loop must be in LCSSA form. Unrolling diff --git a/llvm/test/Transforms/LoopUnroll/nonlatchcondbr.ll b/llvm/test/Transforms/LoopUnroll/nonlatchcondbr.ll --- a/llvm/test/Transforms/LoopUnroll/nonlatchcondbr.ll +++ b/llvm/test/Transforms/LoopUnroll/nonlatchcondbr.ll @@ -40,7 +40,6 @@ ; CHECK: for.body.3: ; CHECK-NEXT: br i1 false, label [[FOR_BODY_FOR_BODY_CRIT_EDGE_3:%.*]], label [[FOR_END:%.*]] ; CHECK: for.body.for.body_crit_edge.3: -; CHECK-NEXT: [[ARRAYIDX_PHI_TRANS_INSERT_3:%.*]] = getelementptr inbounds i32, i32* [[A]], i64 4 ; CHECK-NEXT: unreachable ; entry: @@ -124,7 +123,7 @@ ; CHECK: for.body.for.body_crit_edge.3: ; CHECK-NEXT: [[ARRAYIDX_PHI_TRANS_INSERT_3:%.*]] = getelementptr inbounds i32, i32* [[A]], i64 [[INC_3]] ; CHECK-NEXT: [[DOTPRE_3]] = load i32, i32* [[ARRAYIDX_PHI_TRANS_INSERT_3]], align 4 -; CHECK-NEXT: br label [[FOR_HEADER]], !llvm.loop !0 +; CHECK-NEXT: br label [[FOR_HEADER]], !llvm.loop [[LOOP0:![0-9]+]] ; entry: br i1 true, label %for.preheader, label %for.end @@ -202,7 +201,7 @@ ; CHECK: for.body.for.body_crit_edge.3: ; CHECK-NEXT: [[ARRAYIDX_PHI_TRANS_INSERT_3:%.*]] = getelementptr inbounds i32, i32* [[A]], i64 [[INC_3]] ; CHECK-NEXT: [[DOTPRE_3]] = load i32, i32* [[ARRAYIDX_PHI_TRANS_INSERT_3]], align 4 -; CHECK-NEXT: br label [[FOR_HEADER]], !llvm.loop !2 +; CHECK-NEXT: br label [[FOR_HEADER]], !llvm.loop [[LOOP2:![0-9]+]] ; entry: %0 = load i32, i32* %A, align 4 diff --git a/llvm/test/Transforms/LoopUnroll/optsize-loop-size.ll b/llvm/test/Transforms/LoopUnroll/optsize-loop-size.ll --- a/llvm/test/Transforms/LoopUnroll/optsize-loop-size.ll +++ b/llvm/test/Transforms/LoopUnroll/optsize-loop-size.ll @@ -12,7 +12,6 @@ ; CHECK-NEXT: store i32 [[B:%.*]], i32* [[ARRAYINIT_ELEMENT]], align 4 ; CHECK-NEXT: [[ARRAYINIT_ELEMENT1:%.*]] = getelementptr inbounds [3 x i32], [3 x i32]* [[REF_TMP]], i64 0, i64 2 ; CHECK-NEXT: store i32 [[C:%.*]], i32* [[ARRAYINIT_ELEMENT1]], align 4 -; CHECK-NEXT: [[ADD_PTR_I_I:%.*]] = getelementptr inbounds [3 x i32], [3 x i32]* [[REF_TMP]], i64 0, i64 3 ; CHECK-NEXT: [[CMP_I_I_I3:%.*]] = icmp slt i32 [[A]], [[B]] ; CHECK-NEXT: [[SPEC_SELECT_I_I4:%.*]] = select i1 [[CMP_I_I_I3]], i32* [[ARRAYINIT_ELEMENT]], i32* [[ARRAYINIT_BEGIN]] ; CHECK-NEXT: [[INCDEC_PTR_I_I5:%.*]] = getelementptr inbounds [3 x i32], [3 x i32]* [[REF_TMP]], i64 0, i64 2 @@ -22,7 +21,6 @@ ; CHECK-NEXT: [[DOTPRE2:%.*]] = load i32, i32* [[INCDEC_PTR_I_I5]], align 4 ; CHECK-NEXT: [[CMP_I_I_I:%.*]] = icmp slt i32 [[DOTPRE]], [[DOTPRE2]] ; CHECK-NEXT: [[SPEC_SELECT_I_I:%.*]] = select i1 [[CMP_I_I_I]], i32* [[INCDEC_PTR_I_I5]], i32* [[SPEC_SELECT_I_I4]] -; CHECK-NEXT: [[INCDEC_PTR_I_I:%.*]] = getelementptr inbounds i32, i32* [[INCDEC_PTR_I_I5]], i64 1 ; CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* [[SPEC_SELECT_I_I]], align 4 ; CHECK-NEXT: ret i32 [[TMP1]] ; diff --git a/llvm/test/Transforms/LoopUnroll/pr45939-peel-count-and-complete-unroll.ll b/llvm/test/Transforms/LoopUnroll/pr45939-peel-count-and-complete-unroll.ll --- a/llvm/test/Transforms/LoopUnroll/pr45939-peel-count-and-complete-unroll.ll +++ b/llvm/test/Transforms/LoopUnroll/pr45939-peel-count-and-complete-unroll.ll @@ -163,7 +163,6 @@ ; PEEL8-NEXT: [[ARRAYIDX_7:%.*]] = getelementptr inbounds [8 x i32], [8 x i32]* @a, i64 0, i64 [[INDVARS_IV_NEXT_6]] ; PEEL8-NEXT: [[TMP15:%.*]] = trunc i64 [[INDVARS_IV_NEXT_6]] to i32 ; PEEL8-NEXT: store i32 [[TMP15]], i32* [[ARRAYIDX_7]], align 4 -; PEEL8-NEXT: [[INDVARS_IV_NEXT_7:%.*]] = add nuw nsw i64 [[INDVARS_IV_NEXT_6]], 1 ; PEEL8-NEXT: br label [[FOR_EXIT]] ; PEEL8: for.exit: ; PEEL8-NEXT: ret void @@ -206,7 +205,7 @@ ; PEEL2UNROLL2-NEXT: store i32 [[TMP3]], i32* [[ARRAYIDX_1]], align 4 ; PEEL2UNROLL2-NEXT: [[INDVARS_IV_NEXT_1]] = add nuw nsw i64 [[INDVARS_IV_NEXT]], 1 ; PEEL2UNROLL2-NEXT: [[EXITCOND_1:%.*]] = icmp ne i64 [[INDVARS_IV_NEXT_1]], 8 -; PEEL2UNROLL2-NEXT: br i1 [[EXITCOND_1]], label [[FOR_BODY]], label [[FOR_EXIT_LOOPEXIT:%.*]], !llvm.loop !0 +; PEEL2UNROLL2-NEXT: br i1 [[EXITCOND_1]], label [[FOR_BODY]], label [[FOR_EXIT_LOOPEXIT:%.*]], !llvm.loop [[LOOP0:![0-9]+]] ; PEEL2UNROLL2: for.exit.loopexit: ; PEEL2UNROLL2-NEXT: br label [[FOR_EXIT]] ; PEEL2UNROLL2: for.exit: diff --git a/llvm/test/Transforms/LoopUnroll/scevunroll.ll b/llvm/test/Transforms/LoopUnroll/scevunroll.ll --- a/llvm/test/Transforms/LoopUnroll/scevunroll.ll +++ b/llvm/test/Transforms/LoopUnroll/scevunroll.ll @@ -10,7 +10,6 @@ define i32 @sansCanonical(i32* %base) nounwind { ; CHECK-LABEL: @sansCanonical( ; CHECK-NEXT: entry: -; CHECK-NEXT: [[ZEXT:%.*]] = zext i32 0 to i64 ; CHECK-NEXT: br label [[WHILE_BODY:%.*]] ; CHECK: while.body: ; CHECK-NEXT: [[ADR:%.*]] = getelementptr inbounds i32, i32* [[BASE:%.*]], i64 9 @@ -39,7 +38,6 @@ ; CHECK-NEXT: [[ADR_8:%.*]] = getelementptr inbounds i32, i32* [[BASE]], i64 1 ; CHECK-NEXT: [[TMP_8:%.*]] = load i32, i32* [[ADR_8]], align 8 ; CHECK-NEXT: [[SUM_NEXT_8:%.*]] = add i32 [[SUM_NEXT_7]], [[TMP_8]] -; CHECK-NEXT: [[TMP_9:%.*]] = load i32, i32* [[BASE]], align 8 ; CHECK-NEXT: ret i32 [[SUM_NEXT_8]] ; entry: diff --git a/llvm/test/Transforms/LoopUnroll/unroll-header-exiting-with-phis.ll b/llvm/test/Transforms/LoopUnroll/unroll-header-exiting-with-phis.ll --- a/llvm/test/Transforms/LoopUnroll/unroll-header-exiting-with-phis.ll +++ b/llvm/test/Transforms/LoopUnroll/unroll-header-exiting-with-phis.ll @@ -10,23 +10,18 @@ ; CHECK-NEXT: entry: ; CHECK-NEXT: br label [[FOR_COND:%.*]] ; CHECK: for.cond: -; CHECK-NEXT: [[TMP2:%.*]] = load i16, i16* [[A:%.*]], align 2 ; CHECK-NEXT: br label [[FOR_COND_CLEANUP3:%.*]] ; CHECK: for.cond.cleanup: ; CHECK-NEXT: [[DOTLCSSA10_LCSSA:%.*]] = phi i16 [ [[TMP2_2:%.*]], [[FOR_COND_CLEANUP3_2:%.*]] ] ; CHECK-NEXT: [[TMP3:%.*]] = call i16 @func(i16 [[DOTLCSSA10_LCSSA]]) ; CHECK-NEXT: ret i16 0 ; CHECK: for.cond.cleanup3: -; CHECK-NEXT: [[PTR_1:%.*]] = getelementptr inbounds i16, i16* [[A]], i64 1 -; CHECK-NEXT: [[TMP2_1:%.*]] = load i16, i16* [[PTR_1]], align 2 ; CHECK-NEXT: br label [[FOR_COND_CLEANUP3_1:%.*]] ; CHECK: for.cond.cleanup3.1: -; CHECK-NEXT: [[PTR_2:%.*]] = getelementptr inbounds i16, i16* [[A]], i64 2 +; CHECK-NEXT: [[PTR_2:%.*]] = getelementptr inbounds i16, i16* [[A:%.*]], i64 2 ; CHECK-NEXT: [[TMP2_2]] = load i16, i16* [[PTR_2]], align 2 ; CHECK-NEXT: br label [[FOR_COND_CLEANUP3_2]] ; CHECK: for.cond.cleanup3.2: -; CHECK-NEXT: [[PTR_3:%.*]] = getelementptr inbounds i16, i16* [[A]], i64 3 -; CHECK-NEXT: [[TMP2_3:%.*]] = load i16, i16* [[PTR_3]], align 2 ; CHECK-NEXT: br i1 false, label [[FOR_COND_CLEANUP3_3:%.*]], label [[FOR_COND_CLEANUP:%.*]] ; CHECK: for.cond.cleanup3.3: ; CHECK-NEXT: unreachable @@ -59,8 +54,6 @@ ; CHECK-NEXT: br label [[FOR_COND:%.*]] ; CHECK: for.cond: ; CHECK-NEXT: [[I_0:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[INC9_2:%.*]], [[FOR_COND_CLEANUP3_2:%.*]] ] -; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds i16, i16* [[A:%.*]], i64 [[I_0]] -; CHECK-NEXT: [[TMP2:%.*]] = load i16, i16* [[PTR]], align 2 ; CHECK-NEXT: br label [[FOR_COND_CLEANUP3:%.*]] ; CHECK: for.cond.cleanup: ; CHECK-NEXT: [[DOTLCSSA10_LCSSA:%.*]] = phi i16 [ [[TMP2_1:%.*]], [[FOR_COND_CLEANUP3_1:%.*]] ] @@ -68,13 +61,11 @@ ; CHECK-NEXT: ret i16 0 ; CHECK: for.cond.cleanup3: ; CHECK-NEXT: [[INC9:%.*]] = add nuw nsw i64 [[I_0]], 1 -; CHECK-NEXT: [[PTR_1:%.*]] = getelementptr inbounds i16, i16* [[A]], i64 [[INC9]] +; CHECK-NEXT: [[PTR_1:%.*]] = getelementptr inbounds i16, i16* [[A:%.*]], i64 [[INC9]] ; CHECK-NEXT: [[TMP2_1]] = load i16, i16* [[PTR_1]], align 2 ; CHECK-NEXT: br label [[FOR_COND_CLEANUP3_1]] ; CHECK: for.cond.cleanup3.1: ; CHECK-NEXT: [[INC9_1:%.*]] = add nuw nsw i64 [[INC9]], 1 -; CHECK-NEXT: [[PTR_2:%.*]] = getelementptr inbounds i16, i16* [[A]], i64 [[INC9_1]] -; CHECK-NEXT: [[TMP2_2:%.*]] = load i16, i16* [[PTR_2]], align 2 ; CHECK-NEXT: [[CMP_2:%.*]] = icmp ult i64 [[INC9_1]], 200 ; CHECK-NEXT: br i1 [[CMP_2]], label [[FOR_COND_CLEANUP3_2]], label [[FOR_COND_CLEANUP:%.*]] ; CHECK: for.cond.cleanup3.2: diff --git a/llvm/test/Transforms/LoopUnroll/unroll-unconditional-latch.ll b/llvm/test/Transforms/LoopUnroll/unroll-unconditional-latch.ll --- a/llvm/test/Transforms/LoopUnroll/unroll-unconditional-latch.ll +++ b/llvm/test/Transforms/LoopUnroll/unroll-unconditional-latch.ll @@ -68,7 +68,6 @@ ; CHECK-NEXT: [[RES_LCSSA:%.*]] = phi double [ [[RES_1]], [[LOOP_LATCH]] ] ; CHECK-NEXT: ret double [[RES_LCSSA]] ; CHECK: loop.latch.1: -; CHECK-NEXT: [[PTR_1:%.*]] = getelementptr inbounds double, double* [[ARG2]], i64 2 ; CHECK-NEXT: unreachable ; diff --git a/llvm/test/Transforms/LoopUnrollAndJam/unroll-and-jam.ll b/llvm/test/Transforms/LoopUnrollAndJam/unroll-and-jam.ll --- a/llvm/test/Transforms/LoopUnrollAndJam/unroll-and-jam.ll +++ b/llvm/test/Transforms/LoopUnrollAndJam/unroll-and-jam.ll @@ -141,8 +141,6 @@ ; CHECK-NEXT: [[ADD_LCSSA_EPIL_2:%.*]] = phi i32 [ [[ADD_EPIL_2]], [[FOR_INNER_EPIL_2]] ] ; CHECK-NEXT: [[ARRAYIDX6_EPIL_2:%.*]] = getelementptr inbounds i32, i32* [[A]], i32 [[ADD8_EPIL_1]] ; CHECK-NEXT: store i32 [[ADD_LCSSA_EPIL_2]], i32* [[ARRAYIDX6_EPIL_2]], align 4, !tbaa !0 -; CHECK-NEXT: [[ADD8_EPIL_2:%.*]] = add nuw i32 [[ADD8_EPIL_1]], 1 -; CHECK-NEXT: [[EPIL_ITER_SUB_2:%.*]] = sub i32 [[EPIL_ITER_SUB_1]], 1 ; CHECK-NEXT: br label [[FOR_END_LOOPEXIT_EPILOG_LCSSA]] define void @test1(i32 %I, i32 %J, i32* noalias nocapture %A, i32* noalias nocapture readonly %B) #0 { entry: