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compiler: move OptimizeStringToBytes to transform package

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Unfortunately, while doing this I found that it doesn't actually apply
in any real-world programs (tested with `make smoketest`), apparently
because nil pointer checking messes with the functionattrs pass. I hope
to fix that after moving to LLVM 9, which has an optimization that makes
nil pointer checking easier to implement.
This commit is contained in:
Ayke van Laethem
2019-09-21 18:05:23 +02:00
committed by Ron Evans
parent cea0d9f864
commit 65beddafe8
6 changed files with 151 additions and 102 deletions
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transform/testdata/stringtobytes.ll
Vendored
+32
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64--linux"
@str = constant [6 x i8] c"foobar"
declare { i8*, i64, i64 } @runtime.stringToBytes(i8*, i64)
declare void @printSlice(i8* nocapture readonly, i64, i64)
declare void @writeToSlice(i8* nocapture, i64, i64)
; Test that runtime.stringToBytes can be fully optimized away.
define void @testReadOnly() {
entry:
%0 = call fastcc { i8*, i64, i64 } @runtime.stringToBytes(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @str, i32 0, i32 0), i64 6)
%1 = extractvalue { i8*, i64, i64 } %0, 0
%2 = extractvalue { i8*, i64, i64 } %0, 1
%3 = extractvalue { i8*, i64, i64 } %0, 2
call fastcc void @printSlice(i8* %1, i64 %2, i64 %3)
ret void
}
; Test that even though the slice is written to, some values can be propagated.
define void @testReadWrite() {
entry:
%0 = call fastcc { i8*, i64, i64 } @runtime.stringToBytes(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @str, i32 0, i32 0), i64 6)
%1 = extractvalue { i8*, i64, i64 } %0, 0
%2 = extractvalue { i8*, i64, i64 } %0, 1
%3 = extractvalue { i8*, i64, i64 } %0, 2
call fastcc void @writeToSlice(i8* %1, i64 %2, i64 %3)
ret void
}
transform/testdata/stringtobytes.out.ll
Vendored
+24
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64--linux"
@str = constant [6 x i8] c"foobar"
declare { i8*, i64, i64 } @runtime.stringToBytes(i8*, i64)
declare void @printSlice(i8* nocapture readonly, i64, i64)
declare void @writeToSlice(i8* nocapture, i64, i64)
define void @testReadOnly() {
entry:
call fastcc void @printSlice(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @str, i32 0, i32 0), i64 6, i64 6)
ret void
}
define void @testReadWrite() {
entry:
%0 = call fastcc { i8*, i64, i64 } @runtime.stringToBytes(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @str, i32 0, i32 0), i64 6)
%1 = extractvalue { i8*, i64, i64 } %0, 0
call fastcc void @writeToSlice(i8* %1, i64 6, i64 6)
ret void
}