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llvm-project/llvm/test/Transforms/LoopVectorize/RISCV/interleaved-cost.ll
Philip Reames 37646a2c28 [RISCV] Account for LMUL in memory op costs 
Generally, the cost of a memory op will scale with the number of vector registers accessed. Machines might exist which have a narrow memory access than vector register width, but machines with a wider memory access width than vector register width seem unlikely.

I noticed this because we were preferring wide loads + deinterleaves on examples where the cost of a short gather (actually a strided load) would be better. Touching 8 vector registers instead of doing a 4 element gather is not a good tradeoff.

Differential Revision: https://reviews.llvm.org/D147470
2023-04-05 07:58:56 -07:00

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; REQUIRES: asserts
; RUN: opt -passes=loop-vectorize -mtriple=riscv64 -mattr=+v -force-vector-width=2 -debug-only=loop-vectorize -disable-output < %s 2>&1 | FileCheck %s --check-prefix=VF_2
; RUN: opt -passes=loop-vectorize -mtriple=riscv64 -mattr=+v -force-vector-width=4 -debug-only=loop-vectorize -disable-output < %s 2>&1 | FileCheck %s --check-prefix=VF_4
; RUN: opt -passes=loop-vectorize -mtriple=riscv64 -mattr=+v -force-vector-width=8 -debug-only=loop-vectorize -disable-output < %s 2>&1 | FileCheck %s --check-prefix=VF_8
; RUN: opt -passes=loop-vectorize -mtriple=riscv64 -mattr=+v -force-vector-width=16 -debug-only=loop-vectorize -disable-output < %s 2>&1 | FileCheck %s --check-prefix=VF_16
%i8.2 = type {i8, i8}
define void @i8_factor_2(ptr %data, i64 %n) {
entry:
br label %for.body
; VF_2-LABEL: Checking a loop in 'i8_factor_2'
; VF_2: Found an estimated cost of 2 for VF 2 For instruction: %l0 = load i8, ptr %p0, align 1
; VF_2-NEXT: Found an estimated cost of 0 for VF 2 For instruction: %l1 = load i8, ptr %p1, align 1
; VF_2: Found an estimated cost of 0 for VF 2 For instruction: store i8 %a0, ptr %p0, align 1
; VF_2-NEXT: Found an estimated cost of 2 for VF 2 For instruction: store i8 %a1, ptr %p1, align 1
; VF_4-LABEL: Checking a loop in 'i8_factor_2'
; VF_4: Found an estimated cost of 2 for VF 4 For instruction: %l0 = load i8, ptr %p0, align 1
; VF_4-NEXT: Found an estimated cost of 0 for VF 4 For instruction: %l1 = load i8, ptr %p1, align 1
; VF_4: Found an estimated cost of 0 for VF 4 For instruction: store i8 %a0, ptr %p0, align 1
; VF_4-NEXT: Found an estimated cost of 2 for VF 4 For instruction: store i8 %a1, ptr %p1, align 1
; VF_8-LABEL: Checking a loop in 'i8_factor_2'
; VF_8: Found an estimated cost of 2 for VF 8 For instruction: %l0 = load i8, ptr %p0, align 1
; VF_8-NEXT: Found an estimated cost of 0 for VF 8 For instruction: %l1 = load i8, ptr %p1, align 1
; VF_8: Found an estimated cost of 0 for VF 8 For instruction: store i8 %a0, ptr %p0, align 1
; VF_8-NEXT: Found an estimated cost of 2 for VF 8 For instruction: store i8 %a1, ptr %p1, align 1
; VF_16-LABEL: Checking a loop in 'i8_factor_2'
; VF_16: Found an estimated cost of 3 for VF 16 For instruction: %l0 = load i8, ptr %p0, align 1
; VF_16-NEXT: Found an estimated cost of 0 for VF 16 For instruction: %l1 = load i8, ptr %p1, align 1
; VF_16: Found an estimated cost of 0 for VF 16 For instruction: store i8 %a0, ptr %p0, align 1
; VF_16-NEXT: Found an estimated cost of 3 for VF 16 For instruction: store i8 %a1, ptr %p1, align 1
for.body:
%i = phi i64 [ 0, %entry ], [ %i.next, %for.body ]
%p0 = getelementptr inbounds %i8.2, ptr %data, i64 %i, i32 0
%p1 = getelementptr inbounds %i8.2, ptr %data, i64 %i, i32 1
%l0 = load i8, ptr %p0, align 1
%l1 = load i8, ptr %p1, align 1
%a0 = add i8 %l0, 1
%a1 = add i8 %l1, 2
store i8 %a0, ptr %p0, align 1
store i8 %a1, ptr %p1, align 1
%i.next = add nuw nsw i64 %i, 1
%cond = icmp slt i64 %i.next, %n
br i1 %cond, label %for.body, label %for.end
for.end:
ret void
}
%i8.3 = type {i8, i8, i8}
define void @i8_factor_3(ptr %data, i64 %n) {
entry:
br label %for.body
; VF_2-LABEL: Checking a loop in 'i8_factor_3'
; VF_2: Found an estimated cost of 2 for VF 2 For instruction: %l0 = load i8, ptr %p0, align 1
; VF_2-NEXT: Found an estimated cost of 0 for VF 2 For instruction: %l1 = load i8, ptr %p1, align 1
; VF_2-NEXT: Found an estimated cost of 0 for VF 2 For instruction: %l2 = load i8, ptr %p2, align 1
; VF_2: Found an estimated cost of 0 for VF 2 For instruction: store i8 %a0, ptr %p0, align 1
; VF_2: Found an estimated cost of 0 for VF 2 For instruction: store i8 %a1, ptr %p1, align 1
; VF_2-NEXT: Found an estimated cost of 2 for VF 2 For instruction: store i8 %a2, ptr %p2, align 1
; VF_4-LABEL: Checking a loop in 'i8_factor_3'
; VF_4: Found an estimated cost of 2 for VF 4 For instruction: %l0 = load i8, ptr %p0, align 1
; VF_4-NEXT: Found an estimated cost of 0 for VF 4 For instruction: %l1 = load i8, ptr %p1, align 1
; VF_4-NEXT: Found an estimated cost of 0 for VF 4 For instruction: %l2 = load i8, ptr %p2, align 1
; VF_4: Found an estimated cost of 0 for VF 4 For instruction: store i8 %a0, ptr %p0, align 1
; VF_4: Found an estimated cost of 0 for VF 4 For instruction: store i8 %a1, ptr %p1, align 1
; VF_4-NEXT: Found an estimated cost of 2 for VF 4 For instruction: store i8 %a2, ptr %p2, align 1
; VF_8-LABEL: Checking a loop in 'i8_factor_3'
; VF_8: Found an estimated cost of 3 for VF 8 For instruction: %l0 = load i8, ptr %p0, align 1
; VF_8-NEXT: Found an estimated cost of 0 for VF 8 For instruction: %l1 = load i8, ptr %p1, align 1
; VF_8-NEXT: Found an estimated cost of 0 for VF 8 For instruction: %l2 = load i8, ptr %p2, align 1
; VF_8: Found an estimated cost of 0 for VF 8 For instruction: store i8 %a0, ptr %p0, align 1
; VF_8: Found an estimated cost of 0 for VF 8 For instruction: store i8 %a1, ptr %p1, align 1
; VF_8-NEXT: Found an estimated cost of 3 for VF 8 For instruction: store i8 %a2, ptr %p2, align 1
; VF_16-LABEL: Checking a loop in 'i8_factor_3'
; VF_16: Found an estimated cost of 48 for VF 16 For instruction: %l0 = load i8, ptr %p0, align 1
; VF_16-NEXT: Found an estimated cost of 0 for VF 16 For instruction: %l1 = load i8, ptr %p1, align 1
; VF_16-NEXT: Found an estimated cost of 0 for VF 16 For instruction: %l2 = load i8, ptr %p2, align 1
; VF_16: Found an estimated cost of 0 for VF 16 For instruction: store i8 %a0, ptr %p0, align 1
; VF_16: Found an estimated cost of 0 for VF 16 For instruction: store i8 %a1, ptr %p1, align 1
; VF_16-NEXT: Found an estimated cost of 48 for VF 16 For instruction: store i8 %a2, ptr %p2, align 1
for.body:
%i = phi i64 [ 0, %entry ], [ %i.next, %for.body ]
%p0 = getelementptr inbounds %i8.3, ptr %data, i64 %i, i32 0
%p1 = getelementptr inbounds %i8.3, ptr %data, i64 %i, i32 1
%p2 = getelementptr inbounds %i8.3, ptr %data, i64 %i, i32 2
%l0 = load i8, ptr %p0, align 1
%l1 = load i8, ptr %p1, align 1
%l2 = load i8, ptr %p2, align 1
%a0 = add i8 %l0, 1
%a1 = add i8 %l1, 2
%a2 = add i8 %l2, 3
store i8 %a0, ptr %p0, align 1
store i8 %a1, ptr %p1, align 1
store i8 %a2, ptr %p2, align 1
%i.next = add nuw nsw i64 %i, 1
%cond = icmp slt i64 %i.next, %n
br i1 %cond, label %for.body, label %for.end
for.end:
ret void
}
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