[PowerPC] Adjust load/store costs in PPCTTI
This provides more realistic costs for the insert/extractelement instructions
(which are load/store pairs), accounts for the cheap unaligned Altivec load
sequence, and for unaligned VSX load/stores.
Bad news:
MultiSource/Applications/sgefa/sgefa - 35% slowdown (this will require more investigation)
SingleSource/Benchmarks/McGill/queens - 20% slowdown (we no longer vectorize this, but it was a constant store that was scalarized)
MultiSource/Benchmarks/FreeBench/pcompress2/pcompress2 - 2% slowdown
Good news:
SingleSource/Benchmarks/Shootout/ary3 - 54% speedup
SingleSource/Benchmarks/Shootout-C++/ary - 40% speedup
MultiSource/Benchmarks/Ptrdist/ks/ks - 35% speedup
MultiSource/Benchmarks/FreeBench/neural/neural - 30% speedup
MultiSource/Benchmarks/TSVC/Symbolics-flt/Symbolics-flt - 20% speedup
Unfortunately, estimating the costs of the stack-based scalarization sequences
is hard, and adjusting these costs is like a game of whac-a-mole :( I'll
revisit this again after we have better codegen for vector extloads and
truncstores and unaligned load/stores.
llvm-svn: 205658
diff --git a/llvm/test/Analysis/CostModel/PowerPC/ext.ll b/llvm/test/Analysis/CostModel/PowerPC/ext.ll
index daaa8f5..7d6a14e 100644
--- a/llvm/test/Analysis/CostModel/PowerPC/ext.ll
+++ b/llvm/test/Analysis/CostModel/PowerPC/ext.ll
@@ -13,7 +13,7 @@
; CHECK: cost of 1 {{.*}} sext
%v3 = sext <4 x i16> undef to <4 x i32>
- ; CHECK: cost of 216 {{.*}} sext
+ ; CHECK: cost of 112 {{.*}} sext
%v4 = sext <8 x i16> undef to <8 x i32>
ret void
diff --git a/llvm/test/Analysis/CostModel/PowerPC/insert_extract.ll b/llvm/test/Analysis/CostModel/PowerPC/insert_extract.ll
index f51963d..8dc0031 100644
--- a/llvm/test/Analysis/CostModel/PowerPC/insert_extract.ll
+++ b/llvm/test/Analysis/CostModel/PowerPC/insert_extract.ll
@@ -3,13 +3,13 @@
target triple = "powerpc64-unknown-linux-gnu"
define i32 @insert(i32 %arg) {
- ; CHECK: cost of 13 {{.*}} insertelement
+ ; CHECK: cost of 10 {{.*}} insertelement
%x = insertelement <4 x i32> undef, i32 %arg, i32 0
ret i32 undef
}
define i32 @extract(<4 x i32> %arg) {
- ; CHECK: cost of 13 {{.*}} extractelement
+ ; CHECK: cost of 3 {{.*}} extractelement
%x = extractelement <4 x i32> %arg, i32 0
ret i32 %x
}
diff --git a/llvm/test/Analysis/CostModel/PowerPC/load_store.ll b/llvm/test/Analysis/CostModel/PowerPC/load_store.ll
index 8145a1d..4086278 100644
--- a/llvm/test/Analysis/CostModel/PowerPC/load_store.ll
+++ b/llvm/test/Analysis/CostModel/PowerPC/load_store.ll
@@ -31,9 +31,12 @@
; FIXME: There actually are sub-vector Altivec loads, and so we could handle
; this with a small expense, but we don't currently.
- ; CHECK: cost of 60 {{.*}} load
+ ; CHECK: cost of 48 {{.*}} load
load <4 x i16>* undef, align 2
+ ; CHECK: cost of 1 {{.*}} load
+ load <4 x i32>* undef, align 4
+
ret i32 undef
}