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llvm-mirror/test/Transforms/SROA/fca.ll

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Add a major missing piece to the new SROA pass: aggressive splitting of FCAs. This is essential in order to promote allocas that are used in struct returns by frontends like Clang. The FCA load would block the rest of the pass from firing, resulting is significant regressions with the bullet benchmark in the nightly test suite. Thanks to Duncan for repeated discussions about how best to do this, and to both him and Benjamin for review. This appears to have blocked many places where the pass tries to fire, and so I'm expect somewhat different results with this fix added. As with the last big patch, I'm including a change to enable the SROA by default *temporarily*. Ben is going to remove this as soon as the LNT bots pick up the patch. I'm just trying to get a round of LNT numbers from the stable machines in the lab. NOTE: Four clang tests are expected to fail in the brief window where this is enabled. Sorry for the noise! llvm-svn: 164119
2012-09-18 14:57:43 +02:00
; RUN: opt < %s -sroa -S | FileCheck %s
; RUN: opt < %s -sroa -force-ssa-updater -S | FileCheck %s
Teach the integer-promotion rewrite strategy to be endianness aware. Sorry for this being broken so long. =/ As part of this, switch all of the existing tests to be Little Endian, which is the behavior I was asserting in them anyways! Add in a new big-endian test that checks the interesting behavior there. Another part of this is to tighten the rules abotu when we perform the full-integer promotion. This logic now rejects cases where there fully promoted integer is a non-multiple-of-8 bitwidth or cases where the loads or stores touch bits which are in the allocated space of the alloca but are not loaded or stored when accessing the integer. Sadly, these aren't really observable today as the rest of the pass will already ensure the invariants hold. However, the latter situation is likely to become a potential concern in the future. Thanks to Benjamin and Duncan for early review of this patch. I'm still looking into whether there are further endianness issues, please let me know if anyone sees BE failures persisting past this. llvm-svn: 165219
2012-10-04 12:39:28 +02:00
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-n8:16:32:64"
Add a major missing piece to the new SROA pass: aggressive splitting of FCAs. This is essential in order to promote allocas that are used in struct returns by frontends like Clang. The FCA load would block the rest of the pass from firing, resulting is significant regressions with the bullet benchmark in the nightly test suite. Thanks to Duncan for repeated discussions about how best to do this, and to both him and Benjamin for review. This appears to have blocked many places where the pass tries to fire, and so I'm expect somewhat different results with this fix added. As with the last big patch, I'm including a change to enable the SROA by default *temporarily*. Ben is going to remove this as soon as the LNT bots pick up the patch. I'm just trying to get a round of LNT numbers from the stable machines in the lab. NOTE: Four clang tests are expected to fail in the brief window where this is enabled. Sorry for the noise! llvm-svn: 164119
2012-09-18 14:57:43 +02:00
define { i32, i32 } @test0(i32 %x, i32 %y) {
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 $NAME fi done llvm-svn: 186268
2013-07-14 03:42:54 +02:00
; CHECK-LABEL: @test0(
Add a major missing piece to the new SROA pass: aggressive splitting of FCAs. This is essential in order to promote allocas that are used in struct returns by frontends like Clang. The FCA load would block the rest of the pass from firing, resulting is significant regressions with the bullet benchmark in the nightly test suite. Thanks to Duncan for repeated discussions about how best to do this, and to both him and Benjamin for review. This appears to have blocked many places where the pass tries to fire, and so I'm expect somewhat different results with this fix added. As with the last big patch, I'm including a change to enable the SROA by default *temporarily*. Ben is going to remove this as soon as the LNT bots pick up the patch. I'm just trying to get a round of LNT numbers from the stable machines in the lab. NOTE: Four clang tests are expected to fail in the brief window where this is enabled. Sorry for the noise! llvm-svn: 164119
2012-09-18 14:57:43 +02:00
; CHECK-NOT: alloca
; CHECK: insertvalue { i32, i32 }
; CHECK: insertvalue { i32, i32 }
; CHECK: ret { i32, i32 }
entry:
%a = alloca { i32, i32 }
store { i32, i32 } undef, { i32, i32 }* %a
%gep1 = getelementptr inbounds { i32, i32 }* %a, i32 0, i32 0
store i32 %x, i32* %gep1
%gep2 = getelementptr inbounds { i32, i32 }* %a, i32 0, i32 1
store i32 %y, i32* %gep2
%result = load { i32, i32 }* %a
ret { i32, i32 } %result
}
define { i32, i32 } @test1(i32 %x, i32 %y) {
; FIXME: This may be too conservative. Duncan argues that we are allowed to
; split the volatile load and store here but must produce volatile scalar loads
; and stores from them.
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$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 03:42:54 +02:00
; CHECK-LABEL: @test1(
Add a major missing piece to the new SROA pass: aggressive splitting of FCAs. This is essential in order to promote allocas that are used in struct returns by frontends like Clang. The FCA load would block the rest of the pass from firing, resulting is significant regressions with the bullet benchmark in the nightly test suite. Thanks to Duncan for repeated discussions about how best to do this, and to both him and Benjamin for review. This appears to have blocked many places where the pass tries to fire, and so I'm expect somewhat different results with this fix added. As with the last big patch, I'm including a change to enable the SROA by default *temporarily*. Ben is going to remove this as soon as the LNT bots pick up the patch. I'm just trying to get a round of LNT numbers from the stable machines in the lab. NOTE: Four clang tests are expected to fail in the brief window where this is enabled. Sorry for the noise! llvm-svn: 164119
2012-09-18 14:57:43 +02:00
; CHECK: alloca
; CHECK: alloca
; CHECK: load volatile { i32, i32 }*
; CHECK: store volatile { i32, i32 }
; CHECK: ret { i32, i32 }
entry:
%a = alloca { i32, i32 }
%b = alloca { i32, i32 }
%gep1 = getelementptr inbounds { i32, i32 }* %a, i32 0, i32 0
store i32 %x, i32* %gep1
%gep2 = getelementptr inbounds { i32, i32 }* %a, i32 0, i32 1
store i32 %y, i32* %gep2
%result = load volatile { i32, i32 }* %a
store volatile { i32, i32 } %result, { i32, i32 }* %b
ret { i32, i32 } %result
}
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