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clang-p2996/llvm/test/Analysis/CostModel/ARM/select.ll
David Green a655393f17 [ARM] Add MVE beats vector cost model 
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
2019-08-13 18:12:08 +00:00

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; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
; RUN: opt < %s -cost-model -analyze -mtriple=thumbv8.1-m.main-none-eabi -mattr=+mve.fp | FileCheck %s --check-prefix=CHECK-MVE
; RUN: opt < %s -cost-model -analyze -mtriple=thumbv7-apple-ios6.0.0 -mcpu=swift | FileCheck %s --check-prefix=CHECK-NEON
define void @casts() {
; CHECK-MVE-LABEL: 'casts'
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v1 = select i1 undef, i8 undef, i8 undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v2 = select i1 undef, i16 undef, i16 undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v3 = select i1 undef, i32 undef, i32 undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v4 = select i1 undef, i64 undef, i64 undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v5 = select i1 undef, float undef, float undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v6 = select i1 undef, double undef, double undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 12 for instruction: %v7 = select <2 x i1> undef, <2 x i8> undef, <2 x i8> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v8 = select <4 x i1> undef, <4 x i8> undef, <4 x i8> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v9 = select <8 x i1> undef, <8 x i8> undef, <8 x i8> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v10 = select <16 x i1> undef, <16 x i8> undef, <16 x i8> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 12 for instruction: %v11 = select <2 x i1> undef, <2 x i16> undef, <2 x i16> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v12 = select <4 x i1> undef, <4 x i16> undef, <4 x i16> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v13 = select <8 x i1> undef, <8 x i16> undef, <8 x i16> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %v13b = select <16 x i1> undef, <16 x i16> undef, <16 x i16> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 12 for instruction: %v14 = select <2 x i1> undef, <2 x i32> undef, <2 x i32> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v15 = select <4 x i1> undef, <4 x i32> undef, <4 x i32> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %v15b = select <8 x i1> undef, <8 x i32> undef, <8 x i32> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %v15c = select <16 x i1> undef, <16 x i32> undef, <16 x i32> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 16 for instruction: %v16 = select <2 x i1> undef, <2 x i64> undef, <2 x i64> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 48 for instruction: %v16a = select <4 x i1> undef, <4 x i64> undef, <4 x i64> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 160 for instruction: %v16b = select <8 x i1> undef, <8 x i64> undef, <8 x i64> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 576 for instruction: %v16c = select <16 x i1> undef, <16 x i64> undef, <16 x i64> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v17 = select <2 x i1> undef, <2 x float> undef, <2 x float> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v18 = select <4 x i1> undef, <4 x float> undef, <4 x float> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 12 for instruction: %v19 = select <2 x i1> undef, <2 x double> undef, <2 x double> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %v20 = select <1 x i1> undef, <1 x i32> undef, <1 x i32> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v21 = select <3 x i1> undef, <3 x float> undef, <3 x float> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 60 for instruction: %v22 = select <5 x i1> undef, <5 x double> undef, <5 x double> undef
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
;
; CHECK-NEON-LABEL: 'casts'
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v1 = select i1 undef, i8 undef, i8 undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v2 = select i1 undef, i16 undef, i16 undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v3 = select i1 undef, i32 undef, i32 undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v4 = select i1 undef, i64 undef, i64 undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v5 = select i1 undef, float undef, float undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v6 = select i1 undef, double undef, double undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v7 = select <2 x i1> undef, <2 x i8> undef, <2 x i8> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v8 = select <4 x i1> undef, <4 x i8> undef, <4 x i8> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v9 = select <8 x i1> undef, <8 x i8> undef, <8 x i8> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v10 = select <16 x i1> undef, <16 x i8> undef, <16 x i8> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v11 = select <2 x i1> undef, <2 x i16> undef, <2 x i16> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v12 = select <4 x i1> undef, <4 x i16> undef, <4 x i16> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v13 = select <8 x i1> undef, <8 x i16> undef, <8 x i16> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v13b = select <16 x i1> undef, <16 x i16> undef, <16 x i16> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v14 = select <2 x i1> undef, <2 x i32> undef, <2 x i32> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v15 = select <4 x i1> undef, <4 x i32> undef, <4 x i32> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v15b = select <8 x i1> undef, <8 x i32> undef, <8 x i32> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %v15c = select <16 x i1> undef, <16 x i32> undef, <16 x i32> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v16 = select <2 x i1> undef, <2 x i64> undef, <2 x i64> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 19 for instruction: %v16a = select <4 x i1> undef, <4 x i64> undef, <4 x i64> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 50 for instruction: %v16b = select <8 x i1> undef, <8 x i64> undef, <8 x i64> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 100 for instruction: %v16c = select <16 x i1> undef, <16 x i64> undef, <16 x i64> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v17 = select <2 x i1> undef, <2 x float> undef, <2 x float> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v18 = select <4 x i1> undef, <4 x float> undef, <4 x float> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v19 = select <2 x i1> undef, <2 x double> undef, <2 x double> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v20 = select <1 x i1> undef, <1 x i32> undef, <1 x i32> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %v21 = select <3 x i1> undef, <3 x float> undef, <3 x float> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %v22 = select <5 x i1> undef, <5 x double> undef, <5 x double> undef
; CHECK-NEON-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
;
; Scalar values
%v1 = select i1 undef, i8 undef, i8 undef
%v2 = select i1 undef, i16 undef, i16 undef
%v3 = select i1 undef, i32 undef, i32 undef
%v4 = select i1 undef, i64 undef, i64 undef
%v5 = select i1 undef, float undef, float undef
%v6 = select i1 undef, double undef, double undef
; Vector values
%v7 = select <2 x i1> undef, <2 x i8> undef, <2 x i8> undef
%v8 = select <4 x i1> undef, <4 x i8> undef, <4 x i8> undef
%v9 = select <8 x i1> undef, <8 x i8> undef, <8 x i8> undef
%v10 = select <16 x i1> undef, <16 x i8> undef, <16 x i8> undef
%v11 = select <2 x i1> undef, <2 x i16> undef, <2 x i16> undef
%v12 = select <4 x i1> undef, <4 x i16> undef, <4 x i16> undef
%v13 = select <8 x i1> undef, <8 x i16> undef, <8 x i16> undef
%v13b = select <16 x i1> undef, <16 x i16> undef, <16 x i16> undef
%v14 = select <2 x i1> undef, <2 x i32> undef, <2 x i32> undef
%v15 = select <4 x i1> undef, <4 x i32> undef, <4 x i32> undef
%v15b = select <8 x i1> undef, <8 x i32> undef, <8 x i32> undef
%v15c = select <16 x i1> undef, <16 x i32> undef, <16 x i32> undef
%v16 = select <2 x i1> undef, <2 x i64> undef, <2 x i64> undef
%v16a = select <4 x i1> undef, <4 x i64> undef, <4 x i64> undef
%v16b = select <8 x i1> undef, <8 x i64> undef, <8 x i64> undef
%v16c = select <16 x i1> undef, <16 x i64> undef, <16 x i64> undef
%v17 = select <2 x i1> undef, <2 x float> undef, <2 x float> undef
%v18 = select <4 x i1> undef, <4 x float> undef, <4 x float> undef
%v19 = select <2 x i1> undef, <2 x double> undef, <2 x double> undef
; odd vectors get legalized and should have similar costs
%v20 = select <1 x i1> undef, <1 x i32> undef, <1 x i32> undef
%v21 = select <3 x i1> undef, <3 x float> undef, <3 x float> undef
%v22 = select <5 x i1> undef, <5 x double> undef, <5 x double> undef
ret void
}
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