maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/llvm/test/Transforms/EarlyCSE/basic.ll

294 lines
6.9 KiB
LLVM
Raw Normal View History

Enhance earlycse to do CSE of casts, instsimplify and die. Add a testcase. llvm-svn: 122715
2011-01-03 07:04:14 +08:00
; RUN: opt < %s -S -early-cse | FileCheck %s
[EarlyCSE] Optionally use MemorySSA. NFC. Summary: Use MemorySSA, if requested, to do less conservative memory dependency checking. This change doesn't enable the MemorySSA enhanced EarlyCSE in the default pipelines, so should be NFC. Reviewers: dberlin, sanjoy, reames, majnemer Subscribers: mcrosier, llvm-commits Differential Revision: http://reviews.llvm.org/D19821 llvm-svn: 280279
2016-09-01 03:24:10 +08:00
; RUN: opt < %s -S -basicaa -early-cse-memssa | FileCheck %s
[PM] Port EarlyCSE to the new pass manager. I've added RUN lines both to the basic test for EarlyCSE and the target-specific test, as this serves as a nice test that the TTI layer in the new pass manager is in fact working well. llvm-svn: 227725
2015-02-01 18:51:23 +08:00
; RUN: opt < %s -S -passes=early-cse | FileCheck %s
Enhance earlycse to do CSE of casts, instsimplify and die. Add a testcase. llvm-svn: 122715
2011-01-03 07:04:14 +08:00
EarlyCSE should ignore calls to @llvm.assume EarlyCSE uses a simple generation scheme for handling memory-based dependencies, and calls to @llvm.assume (which are marked as writing to memory to ensure the preservation of control dependencies) disturb that scheme unnecessarily. Skipping calls to @llvm.assume is legal, and the alternative (adding AA calls in EarlyCSE) is likely undesirable (we have GVN for that). Fixes PR21448. llvm-svn: 221175
2014-11-04 04:21:32 +08:00
declare void @llvm.assume(i1) nounwind
Enhance earlycse to do CSE of casts, instsimplify and die. Add a testcase. llvm-svn: 122715
2011-01-03 07:04:14 +08:00
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$NAME" if ! grep -q "^; *RUN: *llc" $NAME; then TEMP=`mktemp -t temp` cp $NAME $TEMP sed -n "s/^define [^@]*@\([A-Za-z0-9_]*\)(.*$/\1/p" < $NAME | \ while read FUNC; do sed -i '' "s/;\(.*\)\([A-Za-z0-9_]*\):\( *\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3@$FUNC(/g" $TEMP done mv $TEMP $NAME fi done llvm-svn: 186268
2013-07-14 09:42:54 +08:00
; CHECK-LABEL: @test1(
Enhance earlycse to do CSE of casts, instsimplify and die. Add a testcase. llvm-svn: 122715
2011-01-03 07:04:14 +08:00
define void @test1(i8 %V, i32 *%P) {
%A = bitcast i64 42 to double ;; dead
%B = add i32 4, 19 ;; constant folds
store i32 %B, i32* %P
; CHECK-NEXT: store i32 23, i32* %P
%C = zext i8 %V to i32
%D = zext i8 %V to i32 ;; CSE
Upgrade syntax of tests using volatile instructions to use 'load volatile' instead of 'volatile load', which is archaic. llvm-svn: 145171
2011-11-27 14:54:59 +08:00
store volatile i32 %C, i32* %P
store volatile i32 %D, i32* %P
Enhance earlycse to do CSE of casts, instsimplify and die. Add a testcase. llvm-svn: 122715
2011-01-03 07:04:14 +08:00
; CHECK-NEXT: %C = zext i8 %V to i32
Move "atomic" and "volatile" designations on instructions after the opcode of the instruction. Note that this change affects the existing non-atomic load and store instructions; the parser now accepts both forms, and the change is noted in the release notes. llvm-svn: 137527
2011-08-13 06:50:01 +08:00
; CHECK-NEXT: store volatile i32 %C
; CHECK-NEXT: store volatile i32 %C
add DEBUG and -stats output to earlycse. Teach it to CSE the rest of the non-side-effecting instructions. llvm-svn: 122716
2011-01-03 07:19:45 +08:00
%E = add i32 %C, %C
%F = add i32 %C, %C
Upgrade syntax of tests using volatile instructions to use 'load volatile' instead of 'volatile load', which is archaic. llvm-svn: 145171
2011-11-27 14:54:59 +08:00
store volatile i32 %E, i32* %P
store volatile i32 %F, i32* %P
add DEBUG and -stats output to earlycse. Teach it to CSE the rest of the non-side-effecting instructions. llvm-svn: 122716
2011-01-03 07:19:45 +08:00
; CHECK-NEXT: %E = add i32 %C, %C
Move "atomic" and "volatile" designations on instructions after the opcode of the instruction. Note that this change affects the existing non-atomic load and store instructions; the parser now accepts both forms, and the change is noted in the release notes. llvm-svn: 137527
2011-08-13 06:50:01 +08:00
; CHECK-NEXT: store volatile i32 %E
; CHECK-NEXT: store volatile i32 %E
add DEBUG and -stats output to earlycse. Teach it to CSE the rest of the non-side-effecting instructions. llvm-svn: 122716
2011-01-03 07:19:45 +08:00
[EarlyCSE] Don't add the overflow flags to the hash We take the intersection of overflow flags while CSE'ing. This permits us to consider two instructions with different overflow behavior to be replaceable. llvm-svn: 267153
2016-04-22 22:12:50 +08:00
%G = add nuw i32 %C, %C
Upgrade syntax of tests using volatile instructions to use 'load volatile' instead of 'volatile load', which is archaic. llvm-svn: 145171
2011-11-27 14:54:59 +08:00
store volatile i32 %G, i32* %P
[EarlyCSE] Don't add the overflow flags to the hash We take the intersection of overflow flags while CSE'ing. This permits us to consider two instructions with different overflow behavior to be replaceable. llvm-svn: 267153
2016-04-22 22:12:50 +08:00
; CHECK-NEXT: store volatile i32 %E
Enhance earlycse to do CSE of casts, instsimplify and die. Add a testcase. llvm-svn: 122715
2011-01-03 07:04:14 +08:00
ret void
}
Teach EarlyCSE to do trivial CSE of loads and read-only calls. On 176.gcc, this catches 13090 loads and calls, and increases the number of simple instructions CSE'd from 29658 to 36208. llvm-svn: 122727
2011-01-03 11:18:43 +08:00
;; Simple load value numbering.
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$NAME" if ! grep -q "^; *RUN: *llc" $NAME; then TEMP=`mktemp -t temp` cp $NAME $TEMP sed -n "s/^define [^@]*@\([A-Za-z0-9_]*\)(.*$/\1/p" < $NAME | \ while read FUNC; do sed -i '' "s/;\(.*\)\([A-Za-z0-9_]*\):\( *\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3@$FUNC(/g" $TEMP done mv $TEMP $NAME fi done llvm-svn: 186268
2013-07-14 09:42:54 +08:00
; CHECK-LABEL: @test2(
Teach EarlyCSE to do trivial CSE of loads and read-only calls. On 176.gcc, this catches 13090 loads and calls, and increases the number of simple instructions CSE'd from 29658 to 36208. llvm-svn: 122727
2011-01-03 11:18:43 +08:00
define i32 @test2(i32 *%P) {
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%V1 = load i32, i32* %P
%V2 = load i32, i32* %P
Teach EarlyCSE to do trivial CSE of loads and read-only calls. On 176.gcc, this catches 13090 loads and calls, and increases the number of simple instructions CSE'd from 29658 to 36208. llvm-svn: 122727
2011-01-03 11:18:43 +08:00
%Diff = sub i32 %V1, %V2
ret i32 %Diff
; CHECK: ret i32 0
}
EarlyCSE should ignore calls to @llvm.assume EarlyCSE uses a simple generation scheme for handling memory-based dependencies, and calls to @llvm.assume (which are marked as writing to memory to ensure the preservation of control dependencies) disturb that scheme unnecessarily. Skipping calls to @llvm.assume is legal, and the alternative (adding AA calls in EarlyCSE) is likely undesirable (we have GVN for that). Fixes PR21448. llvm-svn: 221175
2014-11-04 04:21:32 +08:00
; CHECK-LABEL: @test2a(
define i32 @test2a(i32 *%P, i1 %b) {
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%V1 = load i32, i32* %P
EarlyCSE should ignore calls to @llvm.assume EarlyCSE uses a simple generation scheme for handling memory-based dependencies, and calls to @llvm.assume (which are marked as writing to memory to ensure the preservation of control dependencies) disturb that scheme unnecessarily. Skipping calls to @llvm.assume is legal, and the alternative (adding AA calls in EarlyCSE) is likely undesirable (we have GVN for that). Fixes PR21448. llvm-svn: 221175
2014-11-04 04:21:32 +08:00
tail call void @llvm.assume(i1 %b)
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%V2 = load i32, i32* %P
EarlyCSE should ignore calls to @llvm.assume EarlyCSE uses a simple generation scheme for handling memory-based dependencies, and calls to @llvm.assume (which are marked as writing to memory to ensure the preservation of control dependencies) disturb that scheme unnecessarily. Skipping calls to @llvm.assume is legal, and the alternative (adding AA calls in EarlyCSE) is likely undesirable (we have GVN for that). Fixes PR21448. llvm-svn: 221175
2014-11-04 04:21:32 +08:00
%Diff = sub i32 %V1, %V2
ret i32 %Diff
; CHECK: ret i32 0
}
Teach EarlyCSE to do trivial CSE of loads and read-only calls. On 176.gcc, this catches 13090 loads and calls, and increases the number of simple instructions CSE'd from 29658 to 36208. llvm-svn: 122727
2011-01-03 11:18:43 +08:00
;; Cross block load value numbering.
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$NAME" if ! grep -q "^; *RUN: *llc" $NAME; then TEMP=`mktemp -t temp` cp $NAME $TEMP sed -n "s/^define [^@]*@\([A-Za-z0-9_]*\)(.*$/\1/p" < $NAME | \ while read FUNC; do sed -i '' "s/;\(.*\)\([A-Za-z0-9_]*\):\( *\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3@$FUNC(/g" $TEMP done mv $TEMP $NAME fi done llvm-svn: 186268
2013-07-14 09:42:54 +08:00
; CHECK-LABEL: @test3(
Teach EarlyCSE to do trivial CSE of loads and read-only calls. On 176.gcc, this catches 13090 loads and calls, and increases the number of simple instructions CSE'd from 29658 to 36208. llvm-svn: 122727
2011-01-03 11:18:43 +08:00
define i32 @test3(i32 *%P, i1 %Cond) {
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%V1 = load i32, i32* %P
Teach EarlyCSE to do trivial CSE of loads and read-only calls. On 176.gcc, this catches 13090 loads and calls, and increases the number of simple instructions CSE'd from 29658 to 36208. llvm-svn: 122727
2011-01-03 11:18:43 +08:00
br i1 %Cond, label %T, label %F
T:
store i32 4, i32* %P
ret i32 42
F:
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%V2 = load i32, i32* %P
Teach EarlyCSE to do trivial CSE of loads and read-only calls. On 176.gcc, this catches 13090 loads and calls, and increases the number of simple instructions CSE'd from 29658 to 36208. llvm-svn: 122727
2011-01-03 11:18:43 +08:00
%Diff = sub i32 %V1, %V2
ret i32 %Diff
; CHECK: F:
; CHECK: ret i32 0
}
EarlyCSE should ignore calls to @llvm.assume EarlyCSE uses a simple generation scheme for handling memory-based dependencies, and calls to @llvm.assume (which are marked as writing to memory to ensure the preservation of control dependencies) disturb that scheme unnecessarily. Skipping calls to @llvm.assume is legal, and the alternative (adding AA calls in EarlyCSE) is likely undesirable (we have GVN for that). Fixes PR21448. llvm-svn: 221175
2014-11-04 04:21:32 +08:00
; CHECK-LABEL: @test3a(
define i32 @test3a(i32 *%P, i1 %Cond, i1 %b) {
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%V1 = load i32, i32* %P
EarlyCSE should ignore calls to @llvm.assume EarlyCSE uses a simple generation scheme for handling memory-based dependencies, and calls to @llvm.assume (which are marked as writing to memory to ensure the preservation of control dependencies) disturb that scheme unnecessarily. Skipping calls to @llvm.assume is legal, and the alternative (adding AA calls in EarlyCSE) is likely undesirable (we have GVN for that). Fixes PR21448. llvm-svn: 221175
2014-11-04 04:21:32 +08:00
br i1 %Cond, label %T, label %F
T:
store i32 4, i32* %P
ret i32 42
F:
tail call void @llvm.assume(i1 %b)
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%V2 = load i32, i32* %P
EarlyCSE should ignore calls to @llvm.assume EarlyCSE uses a simple generation scheme for handling memory-based dependencies, and calls to @llvm.assume (which are marked as writing to memory to ensure the preservation of control dependencies) disturb that scheme unnecessarily. Skipping calls to @llvm.assume is legal, and the alternative (adding AA calls in EarlyCSE) is likely undesirable (we have GVN for that). Fixes PR21448. llvm-svn: 221175
2014-11-04 04:21:32 +08:00
%Diff = sub i32 %V1, %V2
ret i32 %Diff
; CHECK: F:
; CHECK: ret i32 0
}
Teach EarlyCSE to do trivial CSE of loads and read-only calls. On 176.gcc, this catches 13090 loads and calls, and increases the number of simple instructions CSE'd from 29658 to 36208. llvm-svn: 122727
2011-01-03 11:18:43 +08:00
;; Cross block load value numbering stops when stores happen.
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$NAME" if ! grep -q "^; *RUN: *llc" $NAME; then TEMP=`mktemp -t temp` cp $NAME $TEMP sed -n "s/^define [^@]*@\([A-Za-z0-9_]*\)(.*$/\1/p" < $NAME | \ while read FUNC; do sed -i '' "s/;\(.*\)\([A-Za-z0-9_]*\):\( *\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3@$FUNC(/g" $TEMP done mv $TEMP $NAME fi done llvm-svn: 186268
2013-07-14 09:42:54 +08:00
; CHECK-LABEL: @test4(
Teach EarlyCSE to do trivial CSE of loads and read-only calls. On 176.gcc, this catches 13090 loads and calls, and increases the number of simple instructions CSE'd from 29658 to 36208. llvm-svn: 122727
2011-01-03 11:18:43 +08:00
define i32 @test4(i32 *%P, i1 %Cond) {
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%V1 = load i32, i32* %P
Teach EarlyCSE to do trivial CSE of loads and read-only calls. On 176.gcc, this catches 13090 loads and calls, and increases the number of simple instructions CSE'd from 29658 to 36208. llvm-svn: 122727
2011-01-03 11:18:43 +08:00
br i1 %Cond, label %T, label %F
T:
ret i32 42
F:
; Clobbers V1
store i32 42, i32* %P
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%V2 = load i32, i32* %P
Teach EarlyCSE to do trivial CSE of loads and read-only calls. On 176.gcc, this catches 13090 loads and calls, and increases the number of simple instructions CSE'd from 29658 to 36208. llvm-svn: 122727
2011-01-03 11:18:43 +08:00
%Diff = sub i32 %V1, %V2
ret i32 %Diff
; CHECK: F:
; CHECK: ret i32 %Diff
}
add a testcase for readonly call CSE llvm-svn: 122730
2011-01-03 11:33:47 +08:00
declare i32 @func(i32 *%P) readonly
;; Simple call CSE'ing.
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$NAME" if ! grep -q "^; *RUN: *llc" $NAME; then TEMP=`mktemp -t temp` cp $NAME $TEMP sed -n "s/^define [^@]*@\([A-Za-z0-9_]*\)(.*$/\1/p" < $NAME | \ while read FUNC; do sed -i '' "s/;\(.*\)\([A-Za-z0-9_]*\):\( *\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3@$FUNC(/g" $TEMP done mv $TEMP $NAME fi done llvm-svn: 186268
2013-07-14 09:42:54 +08:00
; CHECK-LABEL: @test5(
add a testcase for readonly call CSE llvm-svn: 122730
2011-01-03 11:33:47 +08:00
define i32 @test5(i32 *%P) {
%V1 = call i32 @func(i32* %P)
%V2 = call i32 @func(i32* %P)
%Diff = sub i32 %V1, %V2
ret i32 %Diff
; CHECK: ret i32 0
}
now that loads are in their own table, we can implement store->load forwarding. This allows EarlyCSE to zap 600 more loads from 176.gcc. llvm-svn: 122732
2011-01-03 11:46:34 +08:00
;; Trivial Store->load forwarding
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$NAME" if ! grep -q "^; *RUN: *llc" $NAME; then TEMP=`mktemp -t temp` cp $NAME $TEMP sed -n "s/^define [^@]*@\([A-Za-z0-9_]*\)(.*$/\1/p" < $NAME | \ while read FUNC; do sed -i '' "s/;\(.*\)\([A-Za-z0-9_]*\):\( *\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3@$FUNC(/g" $TEMP done mv $TEMP $NAME fi done llvm-svn: 186268
2013-07-14 09:42:54 +08:00
; CHECK-LABEL: @test6(
now that loads are in their own table, we can implement store->load forwarding. This allows EarlyCSE to zap 600 more loads from 176.gcc. llvm-svn: 122732
2011-01-03 11:46:34 +08:00
define i32 @test6(i32 *%P) {
store i32 42, i32* %P
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%V1 = load i32, i32* %P
now that loads are in their own table, we can implement store->load forwarding. This allows EarlyCSE to zap 600 more loads from 176.gcc. llvm-svn: 122732
2011-01-03 11:46:34 +08:00
ret i32 %V1
; CHECK: ret i32 42
}
earlycse can do trivial with-a-block dead store elimination as well. This deletes 60 stores in 176.gcc that largely come from bitfield code. llvm-svn: 122736
2011-01-03 12:17:24 +08:00
EarlyCSE should ignore calls to @llvm.assume EarlyCSE uses a simple generation scheme for handling memory-based dependencies, and calls to @llvm.assume (which are marked as writing to memory to ensure the preservation of control dependencies) disturb that scheme unnecessarily. Skipping calls to @llvm.assume is legal, and the alternative (adding AA calls in EarlyCSE) is likely undesirable (we have GVN for that). Fixes PR21448. llvm-svn: 221175
2014-11-04 04:21:32 +08:00
; CHECK-LABEL: @test6a(
define i32 @test6a(i32 *%P, i1 %b) {
store i32 42, i32* %P
tail call void @llvm.assume(i1 %b)
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%V1 = load i32, i32* %P
EarlyCSE should ignore calls to @llvm.assume EarlyCSE uses a simple generation scheme for handling memory-based dependencies, and calls to @llvm.assume (which are marked as writing to memory to ensure the preservation of control dependencies) disturb that scheme unnecessarily. Skipping calls to @llvm.assume is legal, and the alternative (adding AA calls in EarlyCSE) is likely undesirable (we have GVN for that). Fixes PR21448. llvm-svn: 221175
2014-11-04 04:21:32 +08:00
ret i32 %V1
; CHECK: ret i32 42
}
earlycse can do trivial with-a-block dead store elimination as well. This deletes 60 stores in 176.gcc that largely come from bitfield code. llvm-svn: 122736
2011-01-03 12:17:24 +08:00
;; Trivial dead store elimination.
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$NAME" if ! grep -q "^; *RUN: *llc" $NAME; then TEMP=`mktemp -t temp` cp $NAME $TEMP sed -n "s/^define [^@]*@\([A-Za-z0-9_]*\)(.*$/\1/p" < $NAME | \ while read FUNC; do sed -i '' "s/;\(.*\)\([A-Za-z0-9_]*\):\( *\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3@$FUNC(/g" $TEMP done mv $TEMP $NAME fi done llvm-svn: 186268
2013-07-14 09:42:54 +08:00
; CHECK-LABEL: @test7(
earlycse can do trivial with-a-block dead store elimination as well. This deletes 60 stores in 176.gcc that largely come from bitfield code. llvm-svn: 122736
2011-01-03 12:17:24 +08:00
define void @test7(i32 *%P) {
store i32 42, i32* %P
store i32 45, i32* %P
ret void
; CHECK-NEXT: store i32 45
; CHECK-NEXT: ret void
}
Duncan deftly points out that readnone functions aren't invalidated by stores, so they can be handled as 'simple' operations. llvm-svn: 122785
2011-01-04 07:38:13 +08:00
;; Readnone functions aren't invalidated by stores.
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$NAME" if ! grep -q "^; *RUN: *llc" $NAME; then TEMP=`mktemp -t temp` cp $NAME $TEMP sed -n "s/^define [^@]*@\([A-Za-z0-9_]*\)(.*$/\1/p" < $NAME | \ while read FUNC; do sed -i '' "s/;\(.*\)\([A-Za-z0-9_]*\):\( *\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3@$FUNC(/g" $TEMP done mv $TEMP $NAME fi done llvm-svn: 186268
2013-07-14 09:42:54 +08:00
; CHECK-LABEL: @test8(
Duncan deftly points out that readnone functions aren't invalidated by stores, so they can be handled as 'simple' operations. llvm-svn: 122785
2011-01-04 07:38:13 +08:00
define i32 @test8(i32 *%P) {
%V1 = call i32 @func(i32* %P) readnone
store i32 4, i32* %P
%V2 = call i32 @func(i32* %P) readnone
%Diff = sub i32 %V1, %V2
ret i32 %Diff
; CHECK: ret i32 0
}
Tweak EarlyCSE to recognize series of dead stores EarlyCSE is giving up on the current instruction immediately when it recognizes that the current instruction makes a previous store trivially dead. There's no reason to do this. Once the previous store has been deleted, it's perfectly legal to remember the value of the current store (for value forwarding) and the fact the store occurred (it could be dead too!). Reviewed by: Hal Differential Revision: http://reviews.llvm.org/D6301 llvm-svn: 222241
2014-11-19 01:46:32 +08:00
;; Trivial DSE can't be performed across a readonly call. The call
;; can observe the earlier write.
; CHECK-LABEL: @test9(
define i32 @test9(i32 *%P) {
store i32 4, i32* %P
%V1 = call i32 @func(i32* %P) readonly
store i32 5, i32* %P
ret i32 %V1
; CHECK: store i32 4, i32* %P
; CHECK-NEXT: %V1 = call i32 @func(i32* %P)
; CHECK-NEXT: store i32 5, i32* %P
; CHECK-NEXT: ret i32 %V1
}
;; Trivial DSE can be performed across a readnone call.
; CHECK-LABEL: @test10
define i32 @test10(i32 *%P) {
store i32 4, i32* %P
%V1 = call i32 @func(i32* %P) readnone
store i32 5, i32* %P
ret i32 %V1
; CHECK-NEXT: %V1 = call i32 @func(i32* %P)
; CHECK-NEXT: store i32 5, i32* %P
; CHECK-NEXT: ret i32 %V1
}
;; Trivial dead store elimination - should work for an entire series of dead stores too.
; CHECK-LABEL: @test11(
define void @test11(i32 *%P) {
store i32 42, i32* %P
store i32 43, i32* %P
store i32 44, i32* %P
store i32 45, i32* %P
ret void
; CHECK-NEXT: store i32 45
; CHECK-NEXT: ret void
}
EarlyCSE: Add check lines for test added in r228760 llvm-svn: 228761
2015-02-11 07:11:02 +08:00
; CHECK-LABEL: @test12(
EarlyCSE: It isn't safe to CSE across synchronization boundaries This fixes PR22514. llvm-svn: 228760
2015-02-11 07:09:43 +08:00
define i32 @test12(i1 %B, i32* %P1, i32* %P2) {
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%load0 = load i32, i32* %P1
%1 = load atomic i32, i32* %P2 seq_cst, align 4
%load1 = load i32, i32* %P1
EarlyCSE: It isn't safe to CSE across synchronization boundaries This fixes PR22514. llvm-svn: 228760
2015-02-11 07:09:43 +08:00
%sel = select i1 %B, i32 %load0, i32 %load1
ret i32 %sel
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
; CHECK: load i32, i32* %P1
; CHECK: load i32, i32* %P1
EarlyCSE: It isn't safe to CSE across synchronization boundaries This fixes PR22514. llvm-svn: 228760
2015-02-11 07:09:43 +08:00
}
[EarlyCSE] DSE of stores which write back loaded values Extend EarlyCSE with an additional style of dead store elimination. If we write back a value just read from that memory location, we can eliminate the store under the assumption that the value hasn't changed. I'm implementing this mostly because I noticed the omission when looking at the code. It seemed strange to have InstCombine have a peephole which was more powerful than EarlyCSE. :) Differential Revision: http://reviews.llvm.org/D15397 llvm-svn: 255739
2015-12-16 09:01:30 +08:00
define void @dse1(i32 *%P) {
; CHECK-LABEL: @dse1
; CHECK-NOT: store
%v = load i32, i32* %P
store i32 %v, i32* %P
ret void
}
define void @dse2(i32 *%P) {
; CHECK-LABEL: @dse2
; CHECK-NOT: store
%v = load atomic i32, i32* %P seq_cst, align 4
store i32 %v, i32* %P
ret void
}
define void @dse3(i32 *%P) {
; CHECK-LABEL: @dse3
; CHECK-NOT: store
%v = load atomic i32, i32* %P seq_cst, align 4
store atomic i32 %v, i32* %P unordered, align 4
ret void
}
define i32 @dse4(i32 *%P, i32 *%Q) {
; CHECK-LABEL: @dse4
; CHECK-NOT: store
; CHECK: ret i32 0
%a = load i32, i32* %Q
%v = load atomic i32, i32* %P unordered, align 4
store atomic i32 %v, i32* %P unordered, align 4
%b = load i32, i32* %Q
%res = sub i32 %a, %b
ret i32 %res
}
; Note that in this example, %P and %Q could in fact be the same
; pointer. %v could be different than the value observed for %a
; and that's okay because we're using relaxed memory ordering.
; The only guarantee we have to provide is that each of the loads
; has to observe some value written to that location. We do
; not have to respect the order in which those writes were done.
define i32 @dse5(i32 *%P, i32 *%Q) {
; CHECK-LABEL: @dse5
; CHECK-NOT: store
; CHECK: ret i32 0
%v = load atomic i32, i32* %P unordered, align 4
%a = load atomic i32, i32* %Q unordered, align 4
store atomic i32 %v, i32* %P unordered, align 4
%b = load atomic i32, i32* %Q unordered, align 4
%res = sub i32 %a, %b
ret i32 %res
}
define void @dse_neg1(i32 *%P) {
; CHECK-LABEL: @dse_neg1
; CHECK: store
%v = load i32, i32* %P
store i32 5, i32* %P
ret void
}
; Could remove the store, but only if ordering was somehow
; encoded.
define void @dse_neg2(i32 *%P) {
; CHECK-LABEL: @dse_neg2
; CHECK: store
%v = load i32, i32* %P
store atomic i32 %v, i32* %P seq_cst, align 4
ret void
}
[EarlyCSE] Correctly handle simplified, but live, instructions Some instructions may have their uses replaced with a symbolic constant. However, the instruction may still have side effects which percludes it from being removed from the function. EarlyCSE treated such an instruction as if it were removed, resulting in PR28763. llvm-svn: 277114
2016-07-29 13:39:21 +08:00
@c = external global i32, align 4
declare i32 @reads_c(i32 returned)
define void @pr28763() {
entry:
; CHECK-LABEL: @pr28763(
; CHECK: store i32 0, i32* @c, align 4
; CHECK: call i32 @reads_c(i32 0)
; CHECK: store i32 2, i32* @c, align 4
%load = load i32, i32* @c, align 4
store i32 0, i32* @c, align 4
%call = call i32 @reads_c(i32 0)
store i32 2, i32* @c, align 4
ret void
}