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clang-p2996/llvm/test/Transforms/LoopVectorize/reverse_induction.ll
Florian Hahn 32c4493d5f [VPlan] Add incoming values for all predecessor to ResumePHI (NFCI). 
Follow-up as discussed when using VPInstruction::ResumePhi for all resume
values (#112147). This patch explicitly adds incoming values for each
predecessor in VPlan. This simplifies codegen and allows transformations
adjusting the predecessors of blocks with

NFC modulo incoming block order in phis.
2025-02-09 11:20:20 +00:00

405 lines
23 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt < %s -passes=loop-vectorize -force-vector-interleave=2 -force-vector-width=4 -S | FileCheck %s
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-n8:16:32:64-S128"
; Make sure consecutive vector generates correct negative indices.
; PR15882
define i32 @reverse_induction_i64(i64 %startval, ptr %ptr) {
; CHECK-LABEL: define i32 @reverse_induction_i64(
; CHECK-SAME: i64 [[STARTVAL:%.*]], ptr [[PTR:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: [[IND_END:%.*]] = sub i64 [[STARTVAL]], 1024
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI:%.*]] = phi <4 x i32> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP10:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI2:%.*]] = phi <4 x i32> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP11:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[OFFSET_IDX:%.*]] = sub i64 [[STARTVAL]], [[INDEX]]
; CHECK-NEXT: [[TMP0:%.*]] = add i64 [[OFFSET_IDX]], 0
; CHECK-NEXT: [[TMP3:%.*]] = add i64 [[TMP0]], -1
; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds i32, ptr [[PTR]], i64 [[TMP3]]
; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i32, ptr [[TMP5]], i32 0
; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds i32, ptr [[TMP6]], i32 -3
; CHECK-NEXT: [[TMP8:%.*]] = getelementptr inbounds i32, ptr [[TMP5]], i32 -4
; CHECK-NEXT: [[TMP9:%.*]] = getelementptr inbounds i32, ptr [[TMP8]], i32 -3
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i32>, ptr [[TMP7]], align 4
; CHECK-NEXT: [[REVERSE:%.*]] = shufflevector <4 x i32> [[WIDE_LOAD]], <4 x i32> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT: [[WIDE_LOAD3:%.*]] = load <4 x i32>, ptr [[TMP9]], align 4
; CHECK-NEXT: [[REVERSE4:%.*]] = shufflevector <4 x i32> [[WIDE_LOAD3]], <4 x i32> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT: [[TMP10]] = add <4 x i32> [[REVERSE]], [[VEC_PHI]]
; CHECK-NEXT: [[TMP11]] = add <4 x i32> [[REVERSE4]], [[VEC_PHI2]]
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 8
; CHECK-NEXT: [[TMP12:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1024
; CHECK-NEXT: br i1 [[TMP12]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: [[BIN_RDX:%.*]] = add <4 x i32> [[TMP11]], [[TMP10]]
; CHECK-NEXT: [[TMP13:%.*]] = call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> [[BIN_RDX]])
; CHECK-NEXT: br i1 true, label %[[LOOPEND:.*]], label %[[SCALAR_PH]]
; CHECK: [[SCALAR_PH]]:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[IND_END]], %[[MIDDLE_BLOCK]] ], [ [[STARTVAL]], %[[ENTRY]] ]
; CHECK-NEXT: [[BC_RESUME_VAL4:%.*]] = phi i32 [ 1024, %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT: [[BC_MERGE_RDX:%.*]] = phi i32 [ [[TMP13]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT: br label %[[FOR_BODY:.*]]
; CHECK: [[FOR_BODY]]:
; CHECK-NEXT: [[ADD_I7:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[ADD_I:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT: [[I_06:%.*]] = phi i32 [ [[BC_RESUME_VAL4]], %[[SCALAR_PH]] ], [ [[INC4:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT: [[REDUX5:%.*]] = phi i32 [ [[BC_MERGE_RDX]], %[[SCALAR_PH]] ], [ [[INC_REDUX:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT: [[ADD_I]] = add i64 [[ADD_I7]], -1
; CHECK-NEXT: [[KIND__I:%.*]] = getelementptr inbounds i32, ptr [[PTR]], i64 [[ADD_I]]
; CHECK-NEXT: [[TMP_I1:%.*]] = load i32, ptr [[KIND__I]], align 4
; CHECK-NEXT: [[INC_REDUX]] = add i32 [[TMP_I1]], [[REDUX5]]
; CHECK-NEXT: [[INC4]] = add i32 [[I_06]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[INC4]], 1024
; CHECK-NEXT: br i1 [[EXITCOND]], label %[[FOR_BODY]], label %[[LOOPEND]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK: [[LOOPEND]]:
; CHECK-NEXT: [[INC_REDUX_LCSSA:%.*]] = phi i32 [ [[INC_REDUX]], %[[FOR_BODY]] ], [ [[TMP13]], %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT: ret i32 [[INC_REDUX_LCSSA]]
;
entry:
br label %for.body
for.body:
%add.i7 = phi i64 [ %startval, %entry ], [ %add.i, %for.body ]
%i.06 = phi i32 [ 0, %entry ], [ %inc4, %for.body ]
%redux5 = phi i32 [ 0, %entry ], [ %inc.redux, %for.body ]
%add.i = add i64 %add.i7, -1
%kind_.i = getelementptr inbounds i32, ptr %ptr, i64 %add.i
%tmp.i1 = load i32, ptr %kind_.i, align 4
%inc.redux = add i32 %tmp.i1, %redux5
%inc4 = add i32 %i.06, 1
%exitcond = icmp ne i32 %inc4, 1024
br i1 %exitcond, label %for.body, label %loopend
loopend:
ret i32 %inc.redux
}
define i32 @reverse_induction_i128(i128 %startval, ptr %ptr) {
; CHECK-LABEL: define i32 @reverse_induction_i128(
; CHECK-SAME: i128 [[STARTVAL:%.*]], ptr [[PTR:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: [[IND_END:%.*]] = sub i128 [[STARTVAL]], 1024
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i128 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI:%.*]] = phi <4 x i32> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP10:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI2:%.*]] = phi <4 x i32> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP11:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[OFFSET_IDX:%.*]] = sub i128 [[STARTVAL]], [[INDEX]]
; CHECK-NEXT: [[TMP0:%.*]] = add i128 [[OFFSET_IDX]], 0
; CHECK-NEXT: [[TMP3:%.*]] = add i128 [[TMP0]], -1
; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds i32, ptr [[PTR]], i128 [[TMP3]]
; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i32, ptr [[TMP5]], i32 0
; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds i32, ptr [[TMP6]], i32 -3
; CHECK-NEXT: [[TMP8:%.*]] = getelementptr inbounds i32, ptr [[TMP5]], i32 -4
; CHECK-NEXT: [[TMP9:%.*]] = getelementptr inbounds i32, ptr [[TMP8]], i32 -3
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i32>, ptr [[TMP7]], align 4
; CHECK-NEXT: [[REVERSE:%.*]] = shufflevector <4 x i32> [[WIDE_LOAD]], <4 x i32> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT: [[WIDE_LOAD3:%.*]] = load <4 x i32>, ptr [[TMP9]], align 4
; CHECK-NEXT: [[REVERSE4:%.*]] = shufflevector <4 x i32> [[WIDE_LOAD3]], <4 x i32> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT: [[TMP10]] = add <4 x i32> [[REVERSE]], [[VEC_PHI]]
; CHECK-NEXT: [[TMP11]] = add <4 x i32> [[REVERSE4]], [[VEC_PHI2]]
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i128 [[INDEX]], 8
; CHECK-NEXT: [[TMP12:%.*]] = icmp eq i128 [[INDEX_NEXT]], 1024
; CHECK-NEXT: br i1 [[TMP12]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: [[BIN_RDX:%.*]] = add <4 x i32> [[TMP11]], [[TMP10]]
; CHECK-NEXT: [[TMP13:%.*]] = call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> [[BIN_RDX]])
; CHECK-NEXT: br i1 true, label %[[LOOPEND:.*]], label %[[SCALAR_PH]]
; CHECK: [[SCALAR_PH]]:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i128 [ [[IND_END]], %[[MIDDLE_BLOCK]] ], [ [[STARTVAL]], %[[ENTRY]] ]
; CHECK-NEXT: [[BC_RESUME_VAL4:%.*]] = phi i32 [ 1024, %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT: [[BC_MERGE_RDX:%.*]] = phi i32 [ [[TMP13]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT: br label %[[FOR_BODY:.*]]
; CHECK: [[FOR_BODY]]:
; CHECK-NEXT: [[ADD_I7:%.*]] = phi i128 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[ADD_I:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT: [[I_06:%.*]] = phi i32 [ [[BC_RESUME_VAL4]], %[[SCALAR_PH]] ], [ [[INC4:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT: [[REDUX5:%.*]] = phi i32 [ [[BC_MERGE_RDX]], %[[SCALAR_PH]] ], [ [[INC_REDUX:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT: [[ADD_I]] = add i128 [[ADD_I7]], -1
; CHECK-NEXT: [[KIND__I:%.*]] = getelementptr inbounds i32, ptr [[PTR]], i128 [[ADD_I]]
; CHECK-NEXT: [[TMP_I1:%.*]] = load i32, ptr [[KIND__I]], align 4
; CHECK-NEXT: [[INC_REDUX]] = add i32 [[TMP_I1]], [[REDUX5]]
; CHECK-NEXT: [[INC4]] = add i32 [[I_06]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[INC4]], 1024
; CHECK-NEXT: br i1 [[EXITCOND]], label %[[FOR_BODY]], label %[[LOOPEND]], !llvm.loop [[LOOP5:![0-9]+]]
; CHECK: [[LOOPEND]]:
; CHECK-NEXT: [[INC_REDUX_LCSSA:%.*]] = phi i32 [ [[INC_REDUX]], %[[FOR_BODY]] ], [ [[TMP13]], %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT: ret i32 [[INC_REDUX_LCSSA]]
;
entry:
br label %for.body
for.body:
%add.i7 = phi i128 [ %startval, %entry ], [ %add.i, %for.body ]
%i.06 = phi i32 [ 0, %entry ], [ %inc4, %for.body ]
%redux5 = phi i32 [ 0, %entry ], [ %inc.redux, %for.body ]
%add.i = add i128 %add.i7, -1
%kind_.i = getelementptr inbounds i32, ptr %ptr, i128 %add.i
%tmp.i1 = load i32, ptr %kind_.i, align 4
%inc.redux = add i32 %tmp.i1, %redux5
%inc4 = add i32 %i.06, 1
%exitcond = icmp ne i32 %inc4, 1024
br i1 %exitcond, label %for.body, label %loopend
loopend:
ret i32 %inc.redux
}
define i32 @reverse_induction_i16(i16 %startval, ptr %ptr) {
; CHECK-LABEL: define i32 @reverse_induction_i16(
; CHECK-SAME: i16 [[STARTVAL:%.*]], ptr [[PTR:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_SCEVCHECK:.*]]
; CHECK: [[VECTOR_SCEVCHECK]]:
; CHECK-NEXT: [[TMP0:%.*]] = add i16 [[STARTVAL]], -1
; CHECK-NEXT: [[MUL:%.*]] = call { i16, i1 } @llvm.umul.with.overflow.i16(i16 1, i16 1023)
; CHECK-NEXT: [[MUL_RESULT:%.*]] = extractvalue { i16, i1 } [[MUL]], 0
; CHECK-NEXT: [[MUL_OVERFLOW:%.*]] = extractvalue { i16, i1 } [[MUL]], 1
; CHECK-NEXT: [[TMP1:%.*]] = sub i16 [[TMP0]], [[MUL_RESULT]]
; CHECK-NEXT: [[TMP2:%.*]] = icmp sgt i16 [[TMP1]], [[TMP0]]
; CHECK-NEXT: [[TMP3:%.*]] = or i1 [[TMP2]], [[MUL_OVERFLOW]]
; CHECK-NEXT: br i1 [[TMP3]], label %[[SCALAR_PH]], label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: [[IND_END:%.*]] = sub i16 [[STARTVAL]], 1024
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI:%.*]] = phi <4 x i32> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP14:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI2:%.*]] = phi <4 x i32> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP15:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[DOTCAST:%.*]] = trunc i32 [[INDEX]] to i16
; CHECK-NEXT: [[OFFSET_IDX:%.*]] = sub i16 [[STARTVAL]], [[DOTCAST]]
; CHECK-NEXT: [[TMP4:%.*]] = add i16 [[OFFSET_IDX]], 0
; CHECK-NEXT: [[TMP7:%.*]] = add i16 [[TMP4]], -1
; CHECK-NEXT: [[TMP9:%.*]] = getelementptr inbounds i32, ptr [[PTR]], i16 [[TMP7]]
; CHECK-NEXT: [[TMP10:%.*]] = getelementptr inbounds i32, ptr [[TMP9]], i32 0
; CHECK-NEXT: [[TMP11:%.*]] = getelementptr inbounds i32, ptr [[TMP10]], i32 -3
; CHECK-NEXT: [[TMP12:%.*]] = getelementptr inbounds i32, ptr [[TMP9]], i32 -4
; CHECK-NEXT: [[TMP13:%.*]] = getelementptr inbounds i32, ptr [[TMP12]], i32 -3
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i32>, ptr [[TMP11]], align 4
; CHECK-NEXT: [[REVERSE:%.*]] = shufflevector <4 x i32> [[WIDE_LOAD]], <4 x i32> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT: [[WIDE_LOAD3:%.*]] = load <4 x i32>, ptr [[TMP13]], align 4
; CHECK-NEXT: [[REVERSE4:%.*]] = shufflevector <4 x i32> [[WIDE_LOAD3]], <4 x i32> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT: [[TMP14]] = add <4 x i32> [[REVERSE]], [[VEC_PHI]]
; CHECK-NEXT: [[TMP15]] = add <4 x i32> [[REVERSE4]], [[VEC_PHI2]]
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 8
; CHECK-NEXT: [[TMP16:%.*]] = icmp eq i32 [[INDEX_NEXT]], 1024
; CHECK-NEXT: br i1 [[TMP16]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP6:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: [[BIN_RDX:%.*]] = add <4 x i32> [[TMP15]], [[TMP14]]
; CHECK-NEXT: [[TMP17:%.*]] = call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> [[BIN_RDX]])
; CHECK-NEXT: br i1 true, label %[[LOOPEND:.*]], label %[[SCALAR_PH]]
; CHECK: [[SCALAR_PH]]:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i16 [ [[IND_END]], %[[MIDDLE_BLOCK]] ], [ [[STARTVAL]], %[[ENTRY]] ], [ [[STARTVAL]], %[[VECTOR_SCEVCHECK]] ]
; CHECK-NEXT: [[BC_RESUME_VAL4:%.*]] = phi i32 [ 1024, %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ], [ 0, %[[VECTOR_SCEVCHECK]] ]
; CHECK-NEXT: [[BC_MERGE_RDX:%.*]] = phi i32 [ [[TMP17]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ], [ 0, %[[VECTOR_SCEVCHECK]] ]
; CHECK-NEXT: br label %[[FOR_BODY:.*]]
; CHECK: [[FOR_BODY]]:
; CHECK-NEXT: [[ADD_I7:%.*]] = phi i16 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[ADD_I:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT: [[I_06:%.*]] = phi i32 [ [[BC_RESUME_VAL4]], %[[SCALAR_PH]] ], [ [[INC4:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT: [[REDUX5:%.*]] = phi i32 [ [[BC_MERGE_RDX]], %[[SCALAR_PH]] ], [ [[INC_REDUX:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT: [[ADD_I]] = add i16 [[ADD_I7]], -1
; CHECK-NEXT: [[KIND__I:%.*]] = getelementptr inbounds i32, ptr [[PTR]], i16 [[ADD_I]]
; CHECK-NEXT: [[TMP_I1:%.*]] = load i32, ptr [[KIND__I]], align 4
; CHECK-NEXT: [[INC_REDUX]] = add i32 [[TMP_I1]], [[REDUX5]]
; CHECK-NEXT: [[INC4]] = add i32 [[I_06]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[INC4]], 1024
; CHECK-NEXT: br i1 [[EXITCOND]], label %[[FOR_BODY]], label %[[LOOPEND]], !llvm.loop [[LOOP7:![0-9]+]]
; CHECK: [[LOOPEND]]:
; CHECK-NEXT: [[INC_REDUX_LCSSA:%.*]] = phi i32 [ [[INC_REDUX]], %[[FOR_BODY]] ], [ [[TMP17]], %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT: ret i32 [[INC_REDUX_LCSSA]]
;
entry:
br label %for.body
for.body:
%add.i7 = phi i16 [ %startval, %entry ], [ %add.i, %for.body ]
%i.06 = phi i32 [ 0, %entry ], [ %inc4, %for.body ]
%redux5 = phi i32 [ 0, %entry ], [ %inc.redux, %for.body ]
%add.i = add i16 %add.i7, -1
%kind_.i = getelementptr inbounds i32, ptr %ptr, i16 %add.i
%tmp.i1 = load i32, ptr %kind_.i, align 4
%inc.redux = add i32 %tmp.i1, %redux5
%inc4 = add i32 %i.06, 1
%exitcond = icmp ne i32 %inc4, 1024
br i1 %exitcond, label %for.body, label %loopend
loopend:
ret i32 %inc.redux
}
@a = common global [1024 x i32] zeroinitializer, align 16
; We incorrectly transformed this loop into an empty one because we left the
; induction variable in i8 type and truncated the exit value 1024 to 0.
; int a[1024];
;
; void fail() {
; int reverse_induction = 1023;
; unsigned char forward_induction = 0;
; while ((reverse_induction) >= 0) {
; forward_induction++;
; a[reverse_induction] = forward_induction;
; --reverse_induction;
; }
; }
define void @reverse_forward_induction_i64_i8() {
; CHECK-LABEL: define void @reverse_forward_induction_i64_i8() {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_IND:%.*]] = phi <4 x i8> [ <i8 0, i8 1, i8 2, i8 3>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[STEP_ADD:%.*]] = add <4 x i8> [[VEC_IND]], splat (i8 4)
; CHECK-NEXT: [[OFFSET_IDX:%.*]] = sub i64 1023, [[INDEX]]
; CHECK-NEXT: [[TMP0:%.*]] = add i64 [[OFFSET_IDX]], 0
; CHECK-NEXT: [[TMP2:%.*]] = add <4 x i8> [[VEC_IND]], splat (i8 1)
; CHECK-NEXT: [[TMP3:%.*]] = add <4 x i8> [[STEP_ADD]], splat (i8 1)
; CHECK-NEXT: [[TMP4:%.*]] = zext <4 x i8> [[TMP2]] to <4 x i32>
; CHECK-NEXT: [[TMP5:%.*]] = zext <4 x i8> [[TMP3]] to <4 x i32>
; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds [1024 x i32], ptr @a, i64 0, i64 [[TMP0]]
; CHECK-NEXT: [[TMP8:%.*]] = getelementptr inbounds i32, ptr [[TMP6]], i32 0
; CHECK-NEXT: [[TMP9:%.*]] = getelementptr inbounds i32, ptr [[TMP8]], i32 -3
; CHECK-NEXT: [[TMP10:%.*]] = getelementptr inbounds i32, ptr [[TMP6]], i32 -4
; CHECK-NEXT: [[TMP11:%.*]] = getelementptr inbounds i32, ptr [[TMP10]], i32 -3
; CHECK-NEXT: [[REVERSE:%.*]] = shufflevector <4 x i32> [[TMP4]], <4 x i32> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT: store <4 x i32> [[REVERSE]], ptr [[TMP9]], align 4
; CHECK-NEXT: [[REVERSE2:%.*]] = shufflevector <4 x i32> [[TMP5]], <4 x i32> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT: store <4 x i32> [[REVERSE2]], ptr [[TMP11]], align 4
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 8
; CHECK-NEXT: [[VEC_IND_NEXT]] = add <4 x i8> [[STEP_ADD]], splat (i8 4)
; CHECK-NEXT: [[TMP12:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1024
; CHECK-NEXT: br i1 [[TMP12]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP8:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: br i1 true, label %[[WHILE_END:.*]], label %[[SCALAR_PH]]
; CHECK: [[SCALAR_PH]]:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ -1, %[[MIDDLE_BLOCK]] ], [ 1023, %[[ENTRY]] ]
; CHECK-NEXT: [[BC_RESUME_VAL2:%.*]] = phi i8 [ 0, %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT: br label %[[WHILE_BODY:.*]]
; CHECK: [[WHILE_BODY]]:
; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[INDVARS_IV_NEXT:%.*]], %[[WHILE_BODY]] ]
; CHECK-NEXT: [[FORWARD_INDUCTION_05:%.*]] = phi i8 [ [[BC_RESUME_VAL2]], %[[SCALAR_PH]] ], [ [[INC:%.*]], %[[WHILE_BODY]] ]
; CHECK-NEXT: [[INC]] = add i8 [[FORWARD_INDUCTION_05]], 1
; CHECK-NEXT: [[CONV:%.*]] = zext i8 [[INC]] to i32
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [1024 x i32], ptr @a, i64 0, i64 [[INDVARS_IV]]
; CHECK-NEXT: store i32 [[CONV]], ptr [[ARRAYIDX]], align 4
; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add i64 [[INDVARS_IV]], -1
; CHECK-NEXT: [[TMP13:%.*]] = trunc i64 [[INDVARS_IV]] to i32
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[TMP13]], 0
; CHECK-NEXT: br i1 [[CMP]], label %[[WHILE_BODY]], label %[[WHILE_END]], !llvm.loop [[LOOP9:![0-9]+]]
; CHECK: [[WHILE_END]]:
; CHECK-NEXT: ret void
;
entry:
br label %while.body
while.body:
%indvars.iv = phi i64 [ 1023, %entry ], [ %indvars.iv.next, %while.body ]
%forward_induction.05 = phi i8 [ 0, %entry ], [ %inc, %while.body ]
%inc = add i8 %forward_induction.05, 1
%conv = zext i8 %inc to i32
%arrayidx = getelementptr inbounds [1024 x i32], ptr @a, i64 0, i64 %indvars.iv
store i32 %conv, ptr %arrayidx, align 4
%indvars.iv.next = add i64 %indvars.iv, -1
%0 = trunc i64 %indvars.iv to i32
%cmp = icmp sgt i32 %0, 0
br i1 %cmp, label %while.body, label %while.end
while.end:
ret void
}
define void @reverse_forward_induction_i64_i8_signed() {
; CHECK-LABEL: define void @reverse_forward_induction_i64_i8_signed() {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_IND:%.*]] = phi <4 x i8> [ <i8 -127, i8 -126, i8 -125, i8 -124>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[STEP_ADD:%.*]] = add <4 x i8> [[VEC_IND]], splat (i8 4)
; CHECK-NEXT: [[OFFSET_IDX:%.*]] = sub i64 1023, [[INDEX]]
; CHECK-NEXT: [[TMP0:%.*]] = add i64 [[OFFSET_IDX]], 0
; CHECK-NEXT: [[TMP2:%.*]] = add <4 x i8> [[VEC_IND]], splat (i8 1)
; CHECK-NEXT: [[TMP3:%.*]] = add <4 x i8> [[STEP_ADD]], splat (i8 1)
; CHECK-NEXT: [[TMP4:%.*]] = sext <4 x i8> [[TMP2]] to <4 x i32>
; CHECK-NEXT: [[TMP5:%.*]] = sext <4 x i8> [[TMP3]] to <4 x i32>
; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds [1024 x i32], ptr @a, i64 0, i64 [[TMP0]]
; CHECK-NEXT: [[TMP8:%.*]] = getelementptr inbounds i32, ptr [[TMP6]], i32 0
; CHECK-NEXT: [[TMP9:%.*]] = getelementptr inbounds i32, ptr [[TMP8]], i32 -3
; CHECK-NEXT: [[TMP10:%.*]] = getelementptr inbounds i32, ptr [[TMP6]], i32 -4
; CHECK-NEXT: [[TMP11:%.*]] = getelementptr inbounds i32, ptr [[TMP10]], i32 -3
; CHECK-NEXT: [[REVERSE:%.*]] = shufflevector <4 x i32> [[TMP4]], <4 x i32> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT: store <4 x i32> [[REVERSE]], ptr [[TMP9]], align 4
; CHECK-NEXT: [[REVERSE2:%.*]] = shufflevector <4 x i32> [[TMP5]], <4 x i32> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT: store <4 x i32> [[REVERSE2]], ptr [[TMP11]], align 4
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 8
; CHECK-NEXT: [[VEC_IND_NEXT]] = add <4 x i8> [[STEP_ADD]], splat (i8 4)
; CHECK-NEXT: [[TMP12:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1024
; CHECK-NEXT: br i1 [[TMP12]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP10:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: br i1 true, label %[[WHILE_END:.*]], label %[[SCALAR_PH]]
; CHECK: [[SCALAR_PH]]:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ -1, %[[MIDDLE_BLOCK]] ], [ 1023, %[[ENTRY]] ]
; CHECK-NEXT: [[BC_RESUME_VAL2:%.*]] = phi i8 [ -127, %[[MIDDLE_BLOCK]] ], [ -127, %[[ENTRY]] ]
; CHECK-NEXT: br label %[[WHILE_BODY:.*]]
; CHECK: [[WHILE_BODY]]:
; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[INDVARS_IV_NEXT:%.*]], %[[WHILE_BODY]] ]
; CHECK-NEXT: [[FORWARD_INDUCTION_05:%.*]] = phi i8 [ [[BC_RESUME_VAL2]], %[[SCALAR_PH]] ], [ [[INC:%.*]], %[[WHILE_BODY]] ]
; CHECK-NEXT: [[INC]] = add i8 [[FORWARD_INDUCTION_05]], 1
; CHECK-NEXT: [[CONV:%.*]] = sext i8 [[INC]] to i32
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [1024 x i32], ptr @a, i64 0, i64 [[INDVARS_IV]]
; CHECK-NEXT: store i32 [[CONV]], ptr [[ARRAYIDX]], align 4
; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add i64 [[INDVARS_IV]], -1
; CHECK-NEXT: [[TMP13:%.*]] = trunc i64 [[INDVARS_IV]] to i32
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[TMP13]], 0
; CHECK-NEXT: br i1 [[CMP]], label %[[WHILE_BODY]], label %[[WHILE_END]], !llvm.loop [[LOOP11:![0-9]+]]
; CHECK: [[WHILE_END]]:
; CHECK-NEXT: ret void
;
entry:
br label %while.body
while.body:
%indvars.iv = phi i64 [ 1023, %entry ], [ %indvars.iv.next, %while.body ]
%forward_induction.05 = phi i8 [ -127, %entry ], [ %inc, %while.body ]
%inc = add i8 %forward_induction.05, 1
%conv = sext i8 %inc to i32
%arrayidx = getelementptr inbounds [1024 x i32], ptr @a, i64 0, i64 %indvars.iv
store i32 %conv, ptr %arrayidx, align 4
%indvars.iv.next = add i64 %indvars.iv, -1
%0 = trunc i64 %indvars.iv to i32
%cmp = icmp sgt i32 %0, 0
br i1 %cmp, label %while.body, label %while.end
while.end:
ret void
}
;.
; CHECK: [[LOOP0]] = distinct !{[[LOOP0]], [[META1:![0-9]+]], [[META2:![0-9]+]]}
; CHECK: [[META1]] = !{!"llvm.loop.isvectorized", i32 1}
; CHECK: [[META2]] = !{!"llvm.loop.unroll.runtime.disable"}
; CHECK: [[LOOP3]] = distinct !{[[LOOP3]], [[META2]], [[META1]]}
; CHECK: [[LOOP4]] = distinct !{[[LOOP4]], [[META1]], [[META2]]}
; CHECK: [[LOOP5]] = distinct !{[[LOOP5]], [[META2]], [[META1]]}
; CHECK: [[LOOP6]] = distinct !{[[LOOP6]], [[META1]], [[META2]]}
; CHECK: [[LOOP7]] = distinct !{[[LOOP7]], [[META1]]}
; CHECK: [[LOOP8]] = distinct !{[[LOOP8]], [[META1]], [[META2]]}
; CHECK: [[LOOP9]] = distinct !{[[LOOP9]], [[META2]], [[META1]]}
; CHECK: [[LOOP10]] = distinct !{[[LOOP10]], [[META1]], [[META2]]}
; CHECK: [[LOOP11]] = distinct !{[[LOOP11]], [[META2]], [[META1]]}
;.
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