a655393f17
The MVE architecture has the idea of "beats", where a vector instruction can be executed over several ticks of the architecture. This adds a similar system into the Arm backend cost model, multiplying the cost of all vector instructions by a factor. This factor essentially becomes the expected difference between scalar code and vector code, on average. MVE Vector instructions can also overlap so the a true cost of them is often lower. But equally scalar instructions can in some situations be dual issued, or have other optimisations such as unrolling or make use of dsp instructions. The default is chosen as 2. This should not prevent vectorisation is a most cases (as the vector instructions will still be doing at least 4 times the work), but it will help prevent over vectorising in cases where the benefits are less likely. This adds things so far to the obvious places in ARMTargetTransformInfo, and updates a few related costs like not treating float instructions as cost 2 just because they are floats. Differential Revision: https://reviews.llvm.org/D66005 llvm-svn: 368733
173 lines
11 KiB
LLVM
173 lines
11 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
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; RUN: opt -cost-model -analyze -mtriple=thumbv8.1-m.main-none-eabi -mattr=+mve < %s | FileCheck %s --check-prefix=CHECK-MVE
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; RUN: opt -cost-model -analyze -mtriple=thumbv8.1-m.main-none-eabi -mattr=+mve.fp < %s | FileCheck %s --check-prefix=CHECK-MVEFP
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define void @f32() {
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; CHECK-MVE-LABEL: 'f32'
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %c = fadd float undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %d = fsub float undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %e = fmul float undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
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;
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; CHECK-MVEFP-LABEL: 'f32'
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %c = fadd float undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %d = fsub float undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %e = fmul float undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
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;
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%c = fadd float undef, undef
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%d = fsub float undef, undef
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%e = fmul float undef, undef
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ret void
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}
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define void @f16() {
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; CHECK-MVE-LABEL: 'f16'
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %c = fadd half undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %d = fsub half undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %e = fmul half undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
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;
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; CHECK-MVEFP-LABEL: 'f16'
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %c = fadd half undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %d = fsub half undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %e = fmul half undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
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;
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%c = fadd half undef, undef
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%d = fsub half undef, undef
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%e = fmul half undef, undef
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ret void
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}
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define void @f64() {
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; CHECK-MVE-LABEL: 'f64'
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %c = fadd double undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %d = fsub double undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %e = fmul double undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
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;
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; CHECK-MVEFP-LABEL: 'f64'
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %c = fadd double undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %d = fsub double undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %e = fmul double undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
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;
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%c = fadd double undef, undef
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%d = fsub double undef, undef
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%e = fmul double undef, undef
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ret void
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}
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define void @vf32() {
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; CHECK-MVE-LABEL: 'vf32'
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %c2 = fadd <2 x float> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %d2 = fsub <2 x float> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %e2 = fmul <2 x float> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 20 for instruction: %c4 = fadd <4 x float> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 20 for instruction: %d4 = fsub <4 x float> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 20 for instruction: %e4 = fmul <4 x float> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 72 for instruction: %c8 = fadd <8 x float> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 72 for instruction: %d8 = fsub <8 x float> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 72 for instruction: %e8 = fmul <8 x float> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
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;
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; CHECK-MVEFP-LABEL: 'vf32'
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %c2 = fadd <2 x float> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %d2 = fsub <2 x float> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %e2 = fmul <2 x float> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %c4 = fadd <4 x float> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %d4 = fsub <4 x float> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %e4 = fmul <4 x float> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %c8 = fadd <8 x float> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %d8 = fsub <8 x float> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %e8 = fmul <8 x float> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
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;
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%c2 = fadd <2 x float> undef, undef
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%d2 = fsub <2 x float> undef, undef
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%e2 = fmul <2 x float> undef, undef
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%c4 = fadd <4 x float> undef, undef
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%d4 = fsub <4 x float> undef, undef
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%e4 = fmul <4 x float> undef, undef
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%c8 = fadd <8 x float> undef, undef
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%d8 = fsub <8 x float> undef, undef
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%e8 = fmul <8 x float> undef, undef
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ret void
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}
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define void @vf16() {
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; CHECK-MVE-LABEL: 'vf16'
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %c2 = fadd <2 x half> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %d2 = fsub <2 x half> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %e2 = fmul <2 x half> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 20 for instruction: %c4 = fadd <4 x half> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 20 for instruction: %d4 = fsub <4 x half> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 20 for instruction: %e4 = fmul <4 x half> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 72 for instruction: %c8 = fadd <8 x half> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 72 for instruction: %d8 = fsub <8 x half> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 72 for instruction: %e8 = fmul <8 x half> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
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;
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; CHECK-MVEFP-LABEL: 'vf16'
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %c2 = fadd <2 x half> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %d2 = fsub <2 x half> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %e2 = fmul <2 x half> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %c4 = fadd <4 x half> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %d4 = fsub <4 x half> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %e4 = fmul <4 x half> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %c8 = fadd <8 x half> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %d8 = fsub <8 x half> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %e8 = fmul <8 x half> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
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;
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%c2 = fadd <2 x half> undef, undef
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%d2 = fsub <2 x half> undef, undef
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%e2 = fmul <2 x half> undef, undef
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%c4 = fadd <4 x half> undef, undef
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%d4 = fsub <4 x half> undef, undef
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%e4 = fmul <4 x half> undef, undef
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%c8 = fadd <8 x half> undef, undef
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%d8 = fsub <8 x half> undef, undef
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%e8 = fmul <8 x half> undef, undef
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ret void
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}
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define void @vf64() {
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; CHECK-MVE-LABEL: 'vf64'
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %c2 = fadd <2 x double> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %d2 = fsub <2 x double> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %e2 = fmul <2 x double> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 20 for instruction: %c4 = fadd <4 x double> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 20 for instruction: %d4 = fsub <4 x double> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 20 for instruction: %e4 = fmul <4 x double> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 72 for instruction: %c8 = fadd <8 x double> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 72 for instruction: %d8 = fsub <8 x double> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 72 for instruction: %e8 = fmul <8 x double> undef, undef
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; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
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;
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; CHECK-MVEFP-LABEL: 'vf64'
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %c2 = fadd <2 x double> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %d2 = fsub <2 x double> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %e2 = fmul <2 x double> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 20 for instruction: %c4 = fadd <4 x double> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 20 for instruction: %d4 = fsub <4 x double> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 20 for instruction: %e4 = fmul <4 x double> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 72 for instruction: %c8 = fadd <8 x double> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 72 for instruction: %d8 = fsub <8 x double> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 72 for instruction: %e8 = fmul <8 x double> undef, undef
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; CHECK-MVEFP-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
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;
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%c2 = fadd <2 x double> undef, undef
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%d2 = fsub <2 x double> undef, undef
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%e2 = fmul <2 x double> undef, undef
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%c4 = fadd <4 x double> undef, undef
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%d4 = fsub <4 x double> undef, undef
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%e4 = fmul <4 x double> undef, undef
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%c8 = fadd <8 x double> undef, undef
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%d8 = fsub <8 x double> undef, undef
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%e8 = fmul <8 x double> undef, undef
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ret void
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}
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