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llvm-project/llvm/test/Transforms/LoopVectorize/RISCV/lmul.ll
Luke Lau f3520c538d
[VPlan] Replace EVL branch condition with (branch-on-count AVLNext, 0) (#152167) 
This changes the branch condition to use the AVL's backedge value
instead of the EVL-based IV.

This allows us to emit bnez on RISC-V and removes a use of the trip
count, which should reduce register pressure.

To match phis with VPlanPatternMatch I've had to relax the assert that
the number of operands must exactly match the pattern for the Phi
opcode, and I've copied over m_ZExtOrSelf from the LLVM IR
PatternMatch.h.

Fixes #151459
2025-08-26 11:19:19 +00:00

164 lines
9.7 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=loop-vectorize -mtriple riscv64 -mattr=+v -S --riscv-v-register-bit-width-lmul=1 | FileCheck %s -check-prefix=LMUL1
; RUN: opt < %s -passes=loop-vectorize -mtriple riscv64 -mattr=+v -S --riscv-v-register-bit-width-lmul=2 | FileCheck %s -check-prefix=LMUL2
; RUN: opt < %s -passes=loop-vectorize -mtriple riscv64 -mattr=+v -S --riscv-v-register-bit-width-lmul=4 | FileCheck %s -check-prefix=LMUL4
; RUN: opt < %s -passes=loop-vectorize -mtriple riscv64 -mattr=+v -S --riscv-v-register-bit-width-lmul=8 | FileCheck %s -check-prefix=LMUL8
; RUN: opt < %s -passes=loop-vectorize -mtriple riscv64 -mattr=+v -S | FileCheck %s -check-prefix=LMUL2
define void @load_store(ptr %p) {
; LMUL1-LABEL: @load_store(
; LMUL1-NEXT: entry:
; LMUL1-NEXT: [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
; LMUL1-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 1024, [[TMP0]]
; LMUL1-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; LMUL1: vector.ph:
; LMUL1-NEXT: [[TMP1:%.*]] = call i64 @llvm.vscale.i64()
; LMUL1-NEXT: [[N_MOD_VF:%.*]] = urem i64 1024, [[TMP1]]
; LMUL1-NEXT: [[N_VEC:%.*]] = sub i64 1024, [[N_MOD_VF]]
; LMUL1-NEXT: br label [[VECTOR_BODY:%.*]]
; LMUL1: vector.body:
; LMUL1-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; LMUL1-NEXT: [[TMP3:%.*]] = getelementptr inbounds i64, ptr [[P:%.*]], i64 [[INDEX]]
; LMUL1-NEXT: [[WIDE_LOAD:%.*]] = load <vscale x 1 x i64>, ptr [[TMP3]], align 8
; LMUL1-NEXT: [[TMP5:%.*]] = add <vscale x 1 x i64> [[WIDE_LOAD]], splat (i64 1)
; LMUL1-NEXT: store <vscale x 1 x i64> [[TMP5]], ptr [[TMP3]], align 8
; LMUL1-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP1]]
; LMUL1-NEXT: [[TMP4:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; LMUL1-NEXT: br i1 [[TMP4]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; LMUL1: middle.block:
; LMUL1-NEXT: [[CMP_N:%.*]] = icmp eq i64 1024, [[N_VEC]]
; LMUL1-NEXT: br i1 [[CMP_N]], label [[FOR_END:%.*]], label [[SCALAR_PH]]
; LMUL1: scalar.ph:
; LMUL1-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
; LMUL1-NEXT: br label [[FOR_BODY:%.*]]
; LMUL1: for.body:
; LMUL1-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[FOR_BODY]] ]
; LMUL1-NEXT: [[Q:%.*]] = getelementptr inbounds i64, ptr [[P]], i64 [[IV]]
; LMUL1-NEXT: [[V:%.*]] = load i64, ptr [[Q]], align 8
; LMUL1-NEXT: [[W:%.*]] = add i64 [[V]], 1
; LMUL1-NEXT: store i64 [[W]], ptr [[Q]], align 8
; LMUL1-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; LMUL1-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], 1024
; LMUL1-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_END]], label [[FOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
; LMUL1: for.end:
; LMUL1-NEXT: ret void
;
; LMUL2-LABEL: @load_store(
; LMUL2-NEXT: entry:
; LMUL2-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; LMUL2: vector.ph:
; LMUL2-NEXT: br label [[VECTOR_BODY:%.*]]
; LMUL2: vector.body:
; LMUL2-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; LMUL2-NEXT: [[AVL:%.*]] = phi i64 [ 1024, [[VECTOR_PH]] ], [ [[AVL_NEXT:%.*]], [[VECTOR_BODY]] ]
; LMUL2-NEXT: [[TMP6:%.*]] = call i32 @llvm.experimental.get.vector.length.i64(i64 [[AVL]], i32 2, i1 true)
; LMUL2-NEXT: [[TMP5:%.*]] = getelementptr inbounds i64, ptr [[P:%.*]], i64 [[INDEX]]
; LMUL2-NEXT: [[WIDE_LOAD:%.*]] = call <vscale x 2 x i64> @llvm.vp.load.nxv2i64.p0(ptr align 8 [[TMP5]], <vscale x 2 x i1> splat (i1 true), i32 [[TMP6]])
; LMUL2-NEXT: [[TMP7:%.*]] = add <vscale x 2 x i64> [[WIDE_LOAD]], splat (i64 1)
; LMUL2-NEXT: call void @llvm.vp.store.nxv2i64.p0(<vscale x 2 x i64> [[TMP7]], ptr align 8 [[TMP5]], <vscale x 2 x i1> splat (i1 true), i32 [[TMP6]])
; LMUL2-NEXT: [[TMP10:%.*]] = zext i32 [[TMP6]] to i64
; LMUL2-NEXT: [[INDEX_NEXT]] = add nuw i64 [[TMP10]], [[INDEX]]
; LMUL2-NEXT: [[AVL_NEXT]] = sub nuw i64 [[AVL]], [[TMP10]]
; LMUL2-NEXT: [[TMP11:%.*]] = icmp eq i64 [[AVL_NEXT]], 0
; LMUL2-NEXT: br i1 [[TMP11]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; LMUL2: middle.block:
; LMUL2-NEXT: br label [[FOR_END:%.*]]
; LMUL2: scalar.ph:
; LMUL2-NEXT: br label [[FOR_BODY:%.*]]
; LMUL2: for.body:
; LMUL2-NEXT: [[IV:%.*]] = phi i64 [ 0, [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[FOR_BODY]] ]
; LMUL2-NEXT: [[Q:%.*]] = getelementptr inbounds i64, ptr [[P]], i64 [[IV]]
; LMUL2-NEXT: [[V:%.*]] = load i64, ptr [[Q]], align 8
; LMUL2-NEXT: [[W:%.*]] = add i64 [[V]], 1
; LMUL2-NEXT: store i64 [[W]], ptr [[Q]], align 8
; LMUL2-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; LMUL2-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], 1024
; LMUL2-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_END]], label [[FOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; LMUL2: for.end:
; LMUL2-NEXT: ret void
;
; LMUL4-LABEL: @load_store(
; LMUL4-NEXT: entry:
; LMUL4-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; LMUL4: vector.ph:
; LMUL4-NEXT: br label [[VECTOR_BODY:%.*]]
; LMUL4: vector.body:
; LMUL4-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; LMUL4-NEXT: [[AVL:%.*]] = phi i64 [ 1024, [[VECTOR_PH]] ], [ [[AVL_NEXT:%.*]], [[VECTOR_BODY]] ]
; LMUL4-NEXT: [[TMP6:%.*]] = call i32 @llvm.experimental.get.vector.length.i64(i64 [[AVL]], i32 4, i1 true)
; LMUL4-NEXT: [[TMP5:%.*]] = getelementptr inbounds i64, ptr [[P:%.*]], i64 [[INDEX]]
; LMUL4-NEXT: [[WIDE_LOAD:%.*]] = call <vscale x 4 x i64> @llvm.vp.load.nxv4i64.p0(ptr align 8 [[TMP5]], <vscale x 4 x i1> splat (i1 true), i32 [[TMP6]])
; LMUL4-NEXT: [[TMP7:%.*]] = add <vscale x 4 x i64> [[WIDE_LOAD]], splat (i64 1)
; LMUL4-NEXT: call void @llvm.vp.store.nxv4i64.p0(<vscale x 4 x i64> [[TMP7]], ptr align 8 [[TMP5]], <vscale x 4 x i1> splat (i1 true), i32 [[TMP6]])
; LMUL4-NEXT: [[TMP10:%.*]] = zext i32 [[TMP6]] to i64
; LMUL4-NEXT: [[INDEX_NEXT]] = add nuw i64 [[TMP10]], [[INDEX]]
; LMUL4-NEXT: [[AVL_NEXT]] = sub nuw i64 [[AVL]], [[TMP10]]
; LMUL4-NEXT: [[TMP11:%.*]] = icmp eq i64 [[AVL_NEXT]], 0
; LMUL4-NEXT: br i1 [[TMP11]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; LMUL4: middle.block:
; LMUL4-NEXT: br label [[FOR_END:%.*]]
; LMUL4: scalar.ph:
; LMUL4-NEXT: br label [[FOR_BODY:%.*]]
; LMUL4: for.body:
; LMUL4-NEXT: [[IV:%.*]] = phi i64 [ 0, [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[FOR_BODY]] ]
; LMUL4-NEXT: [[Q:%.*]] = getelementptr inbounds i64, ptr [[P]], i64 [[IV]]
; LMUL4-NEXT: [[V:%.*]] = load i64, ptr [[Q]], align 8
; LMUL4-NEXT: [[W:%.*]] = add i64 [[V]], 1
; LMUL4-NEXT: store i64 [[W]], ptr [[Q]], align 8
; LMUL4-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; LMUL4-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], 1024
; LMUL4-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_END]], label [[FOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; LMUL4: for.end:
; LMUL4-NEXT: ret void
;
; LMUL8-LABEL: @load_store(
; LMUL8-NEXT: entry:
; LMUL8-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; LMUL8: vector.ph:
; LMUL8-NEXT: br label [[VECTOR_BODY:%.*]]
; LMUL8: vector.body:
; LMUL8-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; LMUL8-NEXT: [[AVL:%.*]] = phi i64 [ 1024, [[VECTOR_PH]] ], [ [[AVL_NEXT:%.*]], [[VECTOR_BODY]] ]
; LMUL8-NEXT: [[TMP6:%.*]] = call i32 @llvm.experimental.get.vector.length.i64(i64 [[AVL]], i32 8, i1 true)
; LMUL8-NEXT: [[TMP5:%.*]] = getelementptr inbounds i64, ptr [[P:%.*]], i64 [[INDEX]]
; LMUL8-NEXT: [[WIDE_LOAD:%.*]] = call <vscale x 8 x i64> @llvm.vp.load.nxv8i64.p0(ptr align 8 [[TMP5]], <vscale x 8 x i1> splat (i1 true), i32 [[TMP6]])
; LMUL8-NEXT: [[TMP7:%.*]] = add <vscale x 8 x i64> [[WIDE_LOAD]], splat (i64 1)
; LMUL8-NEXT: call void @llvm.vp.store.nxv8i64.p0(<vscale x 8 x i64> [[TMP7]], ptr align 8 [[TMP5]], <vscale x 8 x i1> splat (i1 true), i32 [[TMP6]])
; LMUL8-NEXT: [[TMP10:%.*]] = zext i32 [[TMP6]] to i64
; LMUL8-NEXT: [[INDEX_NEXT]] = add nuw i64 [[TMP10]], [[INDEX]]
; LMUL8-NEXT: [[AVL_NEXT]] = sub nuw i64 [[AVL]], [[TMP10]]
; LMUL8-NEXT: [[TMP11:%.*]] = icmp eq i64 [[AVL_NEXT]], 0
; LMUL8-NEXT: br i1 [[TMP11]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; LMUL8: middle.block:
; LMUL8-NEXT: br label [[FOR_END:%.*]]
; LMUL8: scalar.ph:
; LMUL8-NEXT: br label [[FOR_BODY:%.*]]
; LMUL8: for.body:
; LMUL8-NEXT: [[IV:%.*]] = phi i64 [ 0, [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[FOR_BODY]] ]
; LMUL8-NEXT: [[Q:%.*]] = getelementptr inbounds i64, ptr [[P]], i64 [[IV]]
; LMUL8-NEXT: [[V:%.*]] = load i64, ptr [[Q]], align 8
; LMUL8-NEXT: [[W:%.*]] = add i64 [[V]], 1
; LMUL8-NEXT: store i64 [[W]], ptr [[Q]], align 8
; LMUL8-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; LMUL8-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], 1024
; LMUL8-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_END]], label [[FOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; LMUL8: for.end:
; LMUL8-NEXT: ret void
;
entry:
br label %for.body
for.body:
%iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
%q = getelementptr inbounds i64, ptr %p, i64 %iv
%v = load i64, ptr %q
%w = add i64 %v, 1
store i64 %w, ptr %q
%iv.next = add nuw nsw i64 %iv, 1
%exitcond.not = icmp eq i64 %iv.next, 1024
br i1 %exitcond.not, label %for.end, label %for.body
for.end:
ret void
}
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