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llvm-mirror/unittests/Transforms/Utils
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Giorgis Georgakoudis c6275bc0ce [CodeExtractor] Replace uses of extracted bitcasts in out-of-region lifetime markers 
CodeExtractor handles bitcasts in the extracted region that have
lifetime markers users in the outer region as outputs. That
creates unnecessary alloca/reload instructions and extra lifetime
markers. The patch identifies those cases, and replaces uses in
out-of-region lifetime markers with new bitcasts in the outer region.

**Example**
```
define void @foo() {
entry:
  %0 = alloca i32
  br label %extract

extract:
  %1 = bitcast i32* %0 to i8*
  call void @llvm.lifetime.start.p0i8(i64 4, i8* %1)
  call void @use(i32* %0)
  br label %exit

exit:
  call void @use(i32* %0)
  call void @llvm.lifetime.end.p0i8(i64 4, i8* %1)
  ret void
}
```

**Current extraction**
```
define void @foo() {
entry:
  %.loc = alloca i8*, align 8
  %0 = alloca i32, align 4
  br label %codeRepl

codeRepl:                                         ; preds = %entry
  %lt.cast = bitcast i8** %.loc to i8*
  call void @llvm.lifetime.start.p0i8(i64 -1, i8* %lt.cast)
  %lt.cast1 = bitcast i32* %0 to i8*
  call void @llvm.lifetime.start.p0i8(i64 -1, i8* %lt.cast1)
  call void @foo.extract(i32* %0, i8** %.loc)
  %.reload = load i8*, i8** %.loc, align 8
  call void @llvm.lifetime.end.p0i8(i64 -1, i8* %lt.cast)
  br label %exit

exit:                                             ; preds = %codeRepl
  call void @use(i32* %0)
  call void @llvm.lifetime.end.p0i8(i64 4, i8* %.reload)
  ret void
}

define internal void @foo.extract(i32* %0, i8** %.out) {
newFuncRoot:
  br label %extract

exit.exitStub:                                    ; preds = %extract
  ret void

extract:                                          ; preds = %newFuncRoot
  %1 = bitcast i32* %0 to i8*
  store i8* %1, i8** %.out, align 8
  call void @use(i32* %0)
  br label %exit.exitStub
}
```

**Extraction with patch**
```
define void @foo() {
entry:
  %0 = alloca i32, align 4
  br label %codeRepl

codeRepl:                                         ; preds = %entry
  %lt.cast1 = bitcast i32* %0 to i8*
  call void @llvm.lifetime.start.p0i8(i64 -1, i8* %lt.cast1)
  call void @foo.extract(i32* %0)
  br label %exit

exit:                                             ; preds = %codeRepl
  call void @use(i32* %0)
  %lt.cast = bitcast i32* %0 to i8*
  call void @llvm.lifetime.end.p0i8(i64 4, i8* %lt.cast)
  ret void
}

define internal void @foo.extract(i32* %0) {
newFuncRoot:
  br label %extract

exit.exitStub:                                    ; preds = %extract
  ret void

extract:                                          ; preds = %newFuncRoot
  %1 = bitcast i32* %0 to i8*
  call void @use(i32* %0)
  br label %exit.exitStub
}
```

Reviewed By: vsk

Differential Revision: https://reviews.llvm.org/D90689
2020-11-05 17:01:08 -08:00
..
ASanStackFrameLayoutTest.cpp
BasicBlockUtilsTest.cpp Revert rG5dd566b7c7b78bd- "PassManager.h - remove unnecessary Function.h/Module.h includes. NFCI." 2020-07-24 13:02:33 +01:00
CallPromotionUtilsTest.cpp [llvm][NFC] Refactor uses of CallSite to CallBase - call promotion 2020-04-12 08:27:29 -07:00
CloningTest.cpp [Cloning] Fix to cloning DISubprograms. 2020-08-21 11:54:56 -07:00
CMakeLists.txt [SCEV] Move ScalarEvolutionExpander.cpp to Transforms/Utils (NFC). 2020-05-20 10:53:40 +01:00
CodeExtractorTest.cpp [CodeExtractor] Replace uses of extracted bitcasts in out-of-region lifetime markers 2020-11-05 17:01:08 -08:00
CodeMoverUtilsTest.cpp [CodeMoverUtils] Add more data dependency related test case 2020-07-22 20:16:07 +05:30
FunctionComparatorTest.cpp
IntegerDivisionTest.cpp
LocalTest.cpp [llvm][NFC] Add missing 'override's in unittests/ 2020-07-17 17:35:59 -07:00
LoopRotationUtilsTest.cpp [LoopRotate] add ability to repeat loop rotation until non-deoptimizing exit is found 2020-01-23 15:56:24 +03:00
LoopUtilsTest.cpp LoopUtils.h - reduce AliasAnalysis.h include to forward declarations. NFC. 2020-06-24 17:58:38 +01:00
ScalarEvolutionExpanderTest.cpp [SCEVExpander] Support expanding nonintegral pointers with constant base. 2020-09-19 17:19:53 +01:00
SizeOptsTest.cpp
SSAUpdaterBulkTest.cpp
UnrollLoopTest.cpp [NFC][SCEV] Piping to pass TTI into SCEVExpander::isHighCostExpansionHelper() 2020-02-25 23:05:56 +03:00
ValueMapperTest.cpp
VFABIUtils.cpp