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llvm-mirror/test/Analysis/CostModel/X86/cmp.ll
Simon Pilgrim 01729bd834 [X86][SSE] Improve cost model for i64 vector comparisons on pre-SSE42 targets 
As discussed on PR24888, until SSE42 we don't have access to PCMPGTQ for v2i64 comparisons, but the cost models don't reflect this, resulting in over-optimistic vectorizaton.

This patch adds SSE2 'base level' costs that match what a typical target is capable of and only reduces the v2i64 costs at SSE42.

Technically SSE41 provides a PCMPEQQ v2i64 equality test, but as getCmpSelInstrCost doesn't give us a way to discriminate between comparison test types we can't easily make use of this, otherwise we could split the cost of integer equality and greater-than tests to give better costings of each.

Differential Revision: http://reviews.llvm.org/D20057

llvm-svn: 268972
2016-05-09 21:14:38 +00:00

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; RUN: opt < %s -cost-model -analyze -mtriple=x86_64-apple-macosx10.8.0 -mcpu=pentium4 | FileCheck --check-prefix=CHECK --check-prefix=SSE --check-prefix=SSE2 %s
; RUN: opt < %s -cost-model -analyze -mtriple=x86_64-apple-macosx10.8.0 -mcpu=yonah | FileCheck --check-prefix=CHECK --check-prefix=SSE --check-prefix=SSE3 %s
; RUN: opt < %s -cost-model -analyze -mtriple=x86_64-apple-macosx10.8.0 -mcpu=core2 | FileCheck --check-prefix=CHECK --check-prefix=SSE --check-prefix=SSSE3 %s
; RUN: opt < %s -cost-model -analyze -mtriple=x86_64-apple-macosx10.8.0 -mcpu=penryn | FileCheck --check-prefix=CHECK --check-prefix=SSE --check-prefix=SSE41 %s
; RUN: opt < %s -cost-model -analyze -mtriple=x86_64-apple-macosx10.8.0 -mcpu=corei7 | FileCheck --check-prefix=CHECK --check-prefix=SSE --check-prefix=SSE42 %s
; RUN: opt < %s -cost-model -analyze -mtriple=x86_64-apple-macosx10.8.0 -mcpu=corei7-avx | FileCheck --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX1 %s
; RUN: opt < %s -cost-model -analyze -mtriple=x86_64-apple-macosx10.8.0 -mcpu=core-avx2 | FileCheck --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX2 %s
; RUN: opt < %s -cost-model -analyze -mtriple=x86_64-apple-macosx10.8.0 -mcpu=knl | FileCheck --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX512 %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.8.0"
define i32 @cmp(i32 %arg) {
; -- floats --
;SSE2: cost of 3 {{.*}} fcmp
;SSE3: cost of 3 {{.*}} fcmp
;SSSE3: cost of 3 {{.*}} fcmp
;SSE41: cost of 3 {{.*}} fcmp
;SSE42: cost of 1 {{.*}} fcmp
;AVX: cost of 1 {{.*}} fcmp
%A = fcmp olt <2 x float> undef, undef
;SSE2: cost of 7 {{.*}} fcmp
;SSE3: cost of 7 {{.*}} fcmp
;SSSE3: cost of 7 {{.*}} fcmp
;SSE41: cost of 7 {{.*}} fcmp
;SSE42: cost of 1 {{.*}} fcmp
;AVX: cost of 1 {{.*}} fcmp
%B = fcmp olt <4 x float> undef, undef
;SSE2: cost of 14 {{.*}} fcmp
;SSE3: cost of 14 {{.*}} fcmp
;SSSE3: cost of 14 {{.*}} fcmp
;SSE41: cost of 14 {{.*}} fcmp
;SSE42: cost of 2 {{.*}} fcmp
;AVX: cost of 1 {{.*}} fcmp
%C = fcmp olt <8 x float> undef, undef
;SSE2: cost of 3 {{.*}} fcmp
;SSE3: cost of 3 {{.*}} fcmp
;SSSE3: cost of 3 {{.*}} fcmp
;SSE41: cost of 3 {{.*}} fcmp
;SSE42: cost of 1 {{.*}} fcmp
;AVX: cost of 1 {{.*}} fcmp
%D = fcmp olt <2 x double> undef, undef
;SSE2: cost of 6 {{.*}} fcmp
;SSE3: cost of 6 {{.*}} fcmp
;SSSE3: cost of 6 {{.*}} fcmp
;SSE41: cost of 6 {{.*}} fcmp
;SSE42: cost of 2 {{.*}} fcmp
;AVX: cost of 1 {{.*}} fcmp
%E = fcmp olt <4 x double> undef, undef
; AVX512: cost of 1 {{.*}} %E1 = fcmp
%E1 = fcmp olt <16 x float> undef, undef
; AVX512: cost of 1 {{.*}} %E2 = fcmp
%E2 = fcmp olt <8 x double> undef, undef
; AVX512: cost of 2 {{.*}} %E3 = fcmp
%E3 = fcmp olt <16 x double> undef, undef
; -- integers --
;SSE2: cost of 1 {{.*}} icmp
;SSE3: cost of 1 {{.*}} icmp
;SSSE3: cost of 1 {{.*}} icmp
;SSE41: cost of 1 {{.*}} icmp
;SSE42: cost of 1 {{.*}} icmp
;AVX: cost of 1 {{.*}} icmp
%F = icmp eq <16 x i8> undef, undef
;SSE2: cost of 1 {{.*}} icmp
;SSE3: cost of 1 {{.*}} icmp
;SSSE3: cost of 1 {{.*}} icmp
;SSE41: cost of 1 {{.*}} icmp
;SSE42: cost of 1 {{.*}} icmp
;AVX: cost of 1 {{.*}} icmp
%G = icmp eq <8 x i16> undef, undef
;SSE2: cost of 1 {{.*}} icmp
;SSE3: cost of 1 {{.*}} icmp
;SSSE3: cost of 1 {{.*}} icmp
;SSE41: cost of 1 {{.*}} icmp
;SSE42: cost of 1 {{.*}} icmp
;AVX: cost of 1 {{.*}} icmp
%H = icmp eq <4 x i32> undef, undef
;SSE2: cost of 8 {{.*}} icmp
;SSE3: cost of 8 {{.*}} icmp
;SSSE3: cost of 8 {{.*}} icmp
;SSE41: cost of 8 {{.*}} icmp
;SSE42: cost of 1 {{.*}} icmp
;AVX: cost of 1 {{.*}} icmp
%I = icmp eq <2 x i64> undef, undef
;SSE2: cost of 16 {{.*}} icmp
;SSE3: cost of 16 {{.*}} icmp
;SSSE3: cost of 16 {{.*}} icmp
;SSE41: cost of 16 {{.*}} icmp
;SSE42: cost of 2 {{.*}} icmp
;AVX1: cost of 4 {{.*}} icmp
;AVX2: cost of 1 {{.*}} icmp
%J = icmp eq <4 x i64> undef, undef
;SSE2: cost of 2 {{.*}} icmp
;SSE3: cost of 2 {{.*}} icmp
;SSSE3: cost of 2 {{.*}} icmp
;SSE41: cost of 2 {{.*}} icmp
;SSE42: cost of 2 {{.*}} icmp
;AVX1: cost of 4 {{.*}} icmp
;AVX2: cost of 1 {{.*}} icmp
%K = icmp eq <8 x i32> undef, undef
;SSE2: cost of 2 {{.*}} icmp
;SSE3: cost of 2 {{.*}} icmp
;SSSE3: cost of 2 {{.*}} icmp
;SSE41: cost of 2 {{.*}} icmp
;SSE42: cost of 2 {{.*}} icmp
;AVX1: cost of 4 {{.*}} icmp
;AVX2: cost of 1 {{.*}} icmp
%L = icmp eq <16 x i16> undef, undef
;SSE2: cost of 2 {{.*}} icmp
;SSE3: cost of 2 {{.*}} icmp
;SSSE3: cost of 2 {{.*}} icmp
;SSE41: cost of 2 {{.*}} icmp
;SSE42: cost of 2 {{.*}} icmp
;AVX1: cost of 4 {{.*}} icmp
;AVX2: cost of 1 {{.*}} icmp
%M = icmp eq <32 x i8> undef, undef
; AVX512: cost of 1 {{.*}} %M1 = icmp
%M1 = icmp eq <16 x i32> undef, undef
; AVX512: cost of 1 {{.*}} %M2 = icmp
%M2 = icmp eq <8 x i64> undef, undef
; AVX512: cost of 2 {{.*}} %M3 = icmp
%M3 = icmp eq <16 x i64> undef, undef
;CHECK: cost of 0 {{.*}} ret
ret i32 undef
}
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