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llvm-project/llvm/test/Transforms/LoopVectorize/minimumnum-maximumnum-reductions.ll
Florian Hahn 50b9ca4dda
[VPlan] Simplify Plan's entry in removeBranchOnConst. (#154510) 
After https://github.com/llvm/llvm-project/pull/153643, there may be a
BranchOnCond with constant condition in the entry block.

Simplify those in removeBranchOnConst. This removes a number of
redundant conditional branch from entry blocks.

In some cases, it may also make the original scalar loop unreachable,
because we know it will never execute. In that case, we need to remove
the loop from LoopInfo, because all unreachable blocks may dominate each
other, making LoopInfo invalid. In those cases, we can also completely
remove the loop, for which I'll share a follow-up patch.

Depends on https://github.com/llvm/llvm-project/pull/153643.

PR: https://github.com/llvm/llvm-project/pull/154510
2025-09-18 19:25:05 +01:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -passes=loop-vectorize -force-vector-width=2 -force-vector-interleave=2 -S %s | FileCheck %s
; RUN: opt -passes=loop-vectorize -force-vector-width=2 -force-vector-interleave=2 -prefer-inloop-reductions -S %s | FileCheck %s
define float @maximumnum_intrinsic(ptr readonly %x) {
; CHECK-LABEL: define float @maximumnum_intrinsic(
; CHECK-SAME: ptr readonly [[X:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: br label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI:%.*]] = phi <2 x float> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP3:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI1:%.*]] = phi <2 x float> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP4:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds float, ptr [[X]], i32 [[IV]]
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds float, ptr [[GEP]], i32 2
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x float>, ptr [[GEP]], align 4
; CHECK-NEXT: [[WIDE_LOAD2:%.*]] = load <2 x float>, ptr [[TMP2]], align 4
; CHECK-NEXT: [[TMP3]] = call <2 x float> @llvm.maximumnum.v2f32(<2 x float> [[VEC_PHI]], <2 x float> [[WIDE_LOAD]])
; CHECK-NEXT: [[TMP4]] = call <2 x float> @llvm.maximumnum.v2f32(<2 x float> [[VEC_PHI1]], <2 x float> [[WIDE_LOAD2]])
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[IV]], 4
; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[INDEX_NEXT]], 1024
; CHECK-NEXT: br i1 [[TMP5]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: [[RDX_MINMAX:%.*]] = call <2 x float> @llvm.maximumnum.v2f32(<2 x float> [[TMP3]], <2 x float> [[TMP4]])
; CHECK-NEXT: [[TMP6:%.*]] = call float @llvm.vector.reduce.fmax.v2f32(<2 x float> [[RDX_MINMAX]])
; CHECK-NEXT: br label %[[EXIT:.*]]
; CHECK: [[SCALAR_PH:.*]]:
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[IV1:%.*]] = phi i32 [ 0, %[[SCALAR_PH]] ], [ [[INC:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[RED:%.*]] = phi float [ 0.000000e+00, %[[SCALAR_PH]] ], [ [[RED_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds float, ptr [[X]], i32 [[IV1]]
; CHECK-NEXT: [[L:%.*]] = load float, ptr [[GEP1]], align 4
; CHECK-NEXT: [[RED_NEXT]] = tail call float @llvm.maximumnum.f32(float [[RED]], float [[L]])
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[IV1]], 1
; CHECK-NEXT: [[EC:%.*]] = icmp eq i32 [[INC]], 1024
; CHECK-NEXT: br i1 [[EC]], label %[[EXIT]], label %[[LOOP]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: [[RED_NEXT_LCSSA:%.*]] = phi float [ [[RED_NEXT]], %[[LOOP]] ], [ [[TMP6]], %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT: ret float [[RED_NEXT_LCSSA]]
;
entry:
br label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %inc, %loop ]
%red = phi float [ 0.000000e+00, %entry ], [ %red.next, %loop ]
%gep = getelementptr inbounds float, ptr %x, i32 %iv
%l = load float, ptr %gep, align 4
%red.next = tail call float @llvm.maximumnum.f32(float %red, float %l)
%inc = add nuw nsw i32 %iv, 1
%ec = icmp eq i32 %inc, 1024
br i1 %ec, label %exit, label %loop
exit:
ret float %red.next
}
define float @maximumnum_intrinsic_fast(ptr readonly %x) {
; CHECK-LABEL: define float @maximumnum_intrinsic_fast(
; CHECK-SAME: ptr readonly [[X:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: br label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI:%.*]] = phi <2 x float> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP3:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI1:%.*]] = phi <2 x float> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP4:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds float, ptr [[X]], i32 [[IV]]
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds float, ptr [[GEP]], i32 2
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x float>, ptr [[GEP]], align 4
; CHECK-NEXT: [[WIDE_LOAD2:%.*]] = load <2 x float>, ptr [[TMP2]], align 4
; CHECK-NEXT: [[TMP3]] = call fast <2 x float> @llvm.maximumnum.v2f32(<2 x float> [[VEC_PHI]], <2 x float> [[WIDE_LOAD]])
; CHECK-NEXT: [[TMP4]] = call fast <2 x float> @llvm.maximumnum.v2f32(<2 x float> [[VEC_PHI1]], <2 x float> [[WIDE_LOAD2]])
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[IV]], 4
; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[INDEX_NEXT]], 1024
; CHECK-NEXT: br i1 [[TMP5]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: [[RDX_MINMAX:%.*]] = call fast <2 x float> @llvm.maximumnum.v2f32(<2 x float> [[TMP3]], <2 x float> [[TMP4]])
; CHECK-NEXT: [[TMP6:%.*]] = call fast float @llvm.vector.reduce.fmax.v2f32(<2 x float> [[RDX_MINMAX]])
; CHECK-NEXT: br label %[[EXIT:.*]]
; CHECK: [[SCALAR_PH:.*]]:
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[IV1:%.*]] = phi i32 [ 0, %[[SCALAR_PH]] ], [ [[INC:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[RED:%.*]] = phi float [ 0.000000e+00, %[[SCALAR_PH]] ], [ [[RED_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds float, ptr [[X]], i32 [[IV1]]
; CHECK-NEXT: [[L:%.*]] = load float, ptr [[GEP1]], align 4
; CHECK-NEXT: [[RED_NEXT]] = tail call fast float @llvm.maximumnum.f32(float [[RED]], float [[L]])
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[IV1]], 1
; CHECK-NEXT: [[EC:%.*]] = icmp eq i32 [[INC]], 1024
; CHECK-NEXT: br i1 [[EC]], label %[[EXIT]], label %[[LOOP]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: [[RED_NEXT_LCSSA:%.*]] = phi float [ [[RED_NEXT]], %[[LOOP]] ], [ [[TMP6]], %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT: ret float [[RED_NEXT_LCSSA]]
;
entry:
br label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %inc, %loop ]
%red = phi float [ 0.000000e+00, %entry ], [ %red.next, %loop ]
%gep = getelementptr inbounds float, ptr %x, i32 %iv
%l = load float, ptr %gep, align 4
%red.next = tail call fast float @llvm.maximumnum.f32(float %red, float %l)
%inc = add nuw nsw i32 %iv, 1
%ec = icmp eq i32 %inc, 1024
br i1 %ec, label %exit, label %loop
exit:
ret float %red.next
}
define float @minimumnum_intrinsic(ptr readonly %x) {
; CHECK-LABEL: define float @minimumnum_intrinsic(
; CHECK-SAME: ptr readonly [[X:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: br label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI:%.*]] = phi <2 x float> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP3:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI1:%.*]] = phi <2 x float> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP4:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds float, ptr [[X]], i32 [[IV]]
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds float, ptr [[GEP]], i32 2
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x float>, ptr [[GEP]], align 4
; CHECK-NEXT: [[WIDE_LOAD2:%.*]] = load <2 x float>, ptr [[TMP2]], align 4
; CHECK-NEXT: [[TMP3]] = call <2 x float> @llvm.minimumnum.v2f32(<2 x float> [[VEC_PHI]], <2 x float> [[WIDE_LOAD]])
; CHECK-NEXT: [[TMP4]] = call <2 x float> @llvm.minimumnum.v2f32(<2 x float> [[VEC_PHI1]], <2 x float> [[WIDE_LOAD2]])
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[IV]], 4
; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[INDEX_NEXT]], 1024
; CHECK-NEXT: br i1 [[TMP5]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: [[RDX_MINMAX:%.*]] = call <2 x float> @llvm.minimumnum.v2f32(<2 x float> [[TMP3]], <2 x float> [[TMP4]])
; CHECK-NEXT: [[TMP6:%.*]] = call float @llvm.vector.reduce.fmin.v2f32(<2 x float> [[RDX_MINMAX]])
; CHECK-NEXT: br label %[[EXIT:.*]]
; CHECK: [[SCALAR_PH:.*]]:
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[IV1:%.*]] = phi i32 [ 0, %[[SCALAR_PH]] ], [ [[INC:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[RED:%.*]] = phi float [ 0.000000e+00, %[[SCALAR_PH]] ], [ [[RED_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds float, ptr [[X]], i32 [[IV1]]
; CHECK-NEXT: [[L:%.*]] = load float, ptr [[GEP1]], align 4
; CHECK-NEXT: [[RED_NEXT]] = tail call float @llvm.minimumnum.f32(float [[RED]], float [[L]])
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[IV1]], 1
; CHECK-NEXT: [[EC:%.*]] = icmp eq i32 [[INC]], 1024
; CHECK-NEXT: br i1 [[EC]], label %[[EXIT]], label %[[LOOP]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: [[RED_NEXT_LCSSA:%.*]] = phi float [ [[RED_NEXT]], %[[LOOP]] ], [ [[TMP6]], %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT: ret float [[RED_NEXT_LCSSA]]
;
entry:
br label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %inc, %loop ]
%red = phi float [ 0.000000e+00, %entry ], [ %red.next, %loop ]
%gep = getelementptr inbounds float, ptr %x, i32 %iv
%l = load float, ptr %gep, align 4
%red.next = tail call float @llvm.minimumnum.f32(float %red, float %l)
%inc = add nuw nsw i32 %iv, 1
%ec = icmp eq i32 %inc, 1024
br i1 %ec, label %exit, label %loop
exit:
ret float %red.next
}
define float @minimumnum_intrinsic_fast(ptr readonly %x) {
; CHECK-LABEL: define float @minimumnum_intrinsic_fast(
; CHECK-SAME: ptr readonly [[X:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: br label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI:%.*]] = phi <2 x float> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP3:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI1:%.*]] = phi <2 x float> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP4:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds float, ptr [[X]], i32 [[IV]]
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds float, ptr [[GEP]], i32 2
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x float>, ptr [[GEP]], align 4
; CHECK-NEXT: [[WIDE_LOAD2:%.*]] = load <2 x float>, ptr [[TMP2]], align 4
; CHECK-NEXT: [[TMP3]] = call fast <2 x float> @llvm.minimumnum.v2f32(<2 x float> [[VEC_PHI]], <2 x float> [[WIDE_LOAD]])
; CHECK-NEXT: [[TMP4]] = call fast <2 x float> @llvm.minimumnum.v2f32(<2 x float> [[VEC_PHI1]], <2 x float> [[WIDE_LOAD2]])
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[IV]], 4
; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[INDEX_NEXT]], 1024
; CHECK-NEXT: br i1 [[TMP5]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP5:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: [[RDX_MINMAX:%.*]] = call fast <2 x float> @llvm.minimumnum.v2f32(<2 x float> [[TMP3]], <2 x float> [[TMP4]])
; CHECK-NEXT: [[TMP6:%.*]] = call fast float @llvm.vector.reduce.fmin.v2f32(<2 x float> [[RDX_MINMAX]])
; CHECK-NEXT: br label %[[EXIT:.*]]
; CHECK: [[SCALAR_PH:.*]]:
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[IV1:%.*]] = phi i32 [ 0, %[[SCALAR_PH]] ], [ [[INC:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[RED:%.*]] = phi float [ 0.000000e+00, %[[SCALAR_PH]] ], [ [[RED_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds float, ptr [[X]], i32 [[IV1]]
; CHECK-NEXT: [[L:%.*]] = load float, ptr [[GEP1]], align 4
; CHECK-NEXT: [[RED_NEXT]] = tail call fast float @llvm.minimumnum.f32(float [[RED]], float [[L]])
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[IV1]], 1
; CHECK-NEXT: [[EC:%.*]] = icmp eq i32 [[INC]], 1024
; CHECK-NEXT: br i1 [[EC]], label %[[EXIT]], label %[[LOOP]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: [[RED_NEXT_LCSSA:%.*]] = phi float [ [[RED_NEXT]], %[[LOOP]] ], [ [[TMP6]], %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT: ret float [[RED_NEXT_LCSSA]]
;
entry:
br label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %inc, %loop ]
%red = phi float [ 0.000000e+00, %entry ], [ %red.next, %loop ]
%gep = getelementptr inbounds float, ptr %x, i32 %iv
%l = load float, ptr %gep, align 4
%red.next = tail call fast float @llvm.minimumnum.f32(float %red, float %l)
%inc = add nuw nsw i32 %iv, 1
%ec = icmp eq i32 %inc, 1024
br i1 %ec, label %exit, label %loop
exit:
ret float %red.next
}
declare float @llvm.minimumnum.f32(float, float)
declare float @llvm.maximumnum.f32(float, float)
;.
; 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]], [[META1]], [[META2]]}
; CHECK: [[LOOP4]] = distinct !{[[LOOP4]], [[META1]], [[META2]]}
; CHECK: [[LOOP5]] = distinct !{[[LOOP5]], [[META1]], [[META2]]}
;.
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