From: Sanjay Patel <spatel@rotateright.com>
Date: Tue, 18 Dec 2018 22:51:06 +0000 (+0000)
Subject: [InstCombine] add tests for extract of vector load; NFC
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=77376c854e2af4694762f09f90e1e4f1adfc62ee;p=llvm

[InstCombine] add tests for extract of vector load; NFC

There's a mismatch internally about how we are handling these patterns.
We count loads as cheapToScalarize(), but then we don't actually
scalarize them, so that can leave extra instructions compared to where
we started when scalarizing other ops. If it's cheapToScalarize, then
we should be scalarizing.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349560 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/test/Transforms/InstCombine/scalarization.ll b/test/Transforms/InstCombine/scalarization.ll
index a5c5600f0d2..586509542b8 100644
--- a/test/Transforms/InstCombine/scalarization.ll
+++ b/test/Transforms/InstCombine/scalarization.ll
@@ -1,6 +1,63 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt -instcombine -S < %s | FileCheck %s
 
+define i32 @extract_load(<4 x i32>* %p) {
+; CHECK-LABEL: @extract_load(
+; CHECK-NEXT:    [[X:%.*]] = load <4 x i32>, <4 x i32>* [[P:%.*]], align 4
+; CHECK-NEXT:    [[EXT:%.*]] = extractelement <4 x i32> [[X]], i32 1
+; CHECK-NEXT:    ret i32 [[EXT]]
+;
+  %x = load <4 x i32>, <4 x i32>* %p, align 4
+  %ext = extractelement <4 x i32> %x, i32 1
+  ret i32 %ext
+}
+
+define double @extract_load_fp(<4 x double>* %p) {
+; CHECK-LABEL: @extract_load_fp(
+; CHECK-NEXT:    [[X:%.*]] = load <4 x double>, <4 x double>* [[P:%.*]], align 32
+; CHECK-NEXT:    [[EXT:%.*]] = extractelement <4 x double> [[X]], i32 3
+; CHECK-NEXT:    ret double [[EXT]]
+;
+  %x = load <4 x double>, <4 x double>* %p, align 32
+  %ext = extractelement <4 x double> %x, i32 3
+  ret double %ext
+}
+
+define double @extract_load_volatile(<4 x double>* %p) {
+; CHECK-LABEL: @extract_load_volatile(
+; CHECK-NEXT:    [[X:%.*]] = load volatile <4 x double>, <4 x double>* [[P:%.*]], align 32
+; CHECK-NEXT:    [[EXT:%.*]] = extractelement <4 x double> [[X]], i32 2
+; CHECK-NEXT:    ret double [[EXT]]
+;
+  %x = load volatile <4 x double>, <4 x double>* %p
+  %ext = extractelement <4 x double> %x, i32 2
+  ret double %ext
+}
+
+define double @extract_load_extra_use(<4 x double>* %p, <4 x double>* %p2) {
+; CHECK-LABEL: @extract_load_extra_use(
+; CHECK-NEXT:    [[X:%.*]] = load <4 x double>, <4 x double>* [[P:%.*]], align 8
+; CHECK-NEXT:    [[EXT:%.*]] = extractelement <4 x double> [[X]], i32 0
+; CHECK-NEXT:    store <4 x double> [[X]], <4 x double>* [[P2:%.*]], align 32
+; CHECK-NEXT:    ret double [[EXT]]
+;
+  %x = load <4 x double>, <4 x double>* %p, align 8
+  %ext = extractelement <4 x double> %x, i32 0
+  store <4 x double> %x, <4 x double>* %p2
+  ret double %ext
+}
+
+define double @extract_load_variable_index(<4 x double>* %p, i32 %y) {
+; CHECK-LABEL: @extract_load_variable_index(
+; CHECK-NEXT:    [[X:%.*]] = load <4 x double>, <4 x double>* [[P:%.*]], align 32
+; CHECK-NEXT:    [[EXT:%.*]] = extractelement <4 x double> [[X]], i32 [[Y:%.*]]
+; CHECK-NEXT:    ret double [[EXT]]
+;
+  %x = load <4 x double>, <4 x double>* %p
+  %ext = extractelement <4 x double> %x, i32 %y
+  ret double %ext
+}
+
 define void @scalarize_phi(i32 * %n, float * %inout) {
 ; CHECK-LABEL: @scalarize_phi(
 ; CHECK-NEXT:  entry: