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462f650cad
If a constant is unamed_addr and is only used within one function, we can save
on the code size and runtime cost of an indirection by changing the global's storage
to inside the constant pool. For example, instead of:
ldr r0, .CPI0
bl printf
bx lr
.CPI0: &format_string
format_string: .asciz "hello, world!\n"
We can emit:
adr r0, .CPI0
bl printf
bx lr
.CPI0: .asciz "hello, world!\n"
This can cause significant code size savings when many small strings are used in one
function (4 bytes per string).
This recommit contains fixes for a nasty bug related to fast-isel fallback - because
fast-isel doesn't know about this optimization, if it runs and emits references to
a string that we inline (because fast-isel fell back to SDAG) we will end up
with an inlined string and also an out-of-line string, and we won't emit the
out-of-line string, causing backend failures.
It also contains fixes for emitting .text relocations which made the sanitizer
bots unhappy.
llvm-svn: 282387
45 lines
2.4 KiB
LLVM
45 lines
2.4 KiB
LLVM
; RUN: llc -relocation-model=static < %s | FileCheck %s
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "thumbv7m--linux-gnu"
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@.str = private unnamed_addr constant [4 x i8] c"abc\00", align 1
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; CHECK-LABEL: fn1
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; CHECK: .str:
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define arm_aapcscc i8* @fn1() local_unnamed_addr #0 !dbg !8 {
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entry:
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ret i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i32 0, i32 0), !dbg !14
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}
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; CHECK-LABEL: fn2
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; CHECK-NOT: .str:
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define arm_aapcscc i8* @fn2() local_unnamed_addr #0 !dbg !15 {
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entry:
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ret i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i32 0, i32 1), !dbg !16
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}
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attributes #0 = { minsize norecurse nounwind optsize readnone "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="cortex-m3" "target-features"="+hwdiv,+soft-float,-crypto,-neon" "unsafe-fp-math"="false" "use-soft-float"="true" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6}
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!llvm.ident = !{!7}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 (http://llvm.org/git/clang.git 075a2bc2570dfcbb6d6aed6c836e4c62b37afea6)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "/Users/jammol01/Code/test.c", directory: "/Users/jammol01/Code/llvm-git/build")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{i32 1, !"min_enum_size", i32 4}
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!7 = !{!"clang version 3.9.0 (http://llvm.org/git/clang.git 075a2bc2570dfcbb6d6aed6c836e4c62b37afea6)"}
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!8 = distinct !DISubprogram(name: "fn1", scope: !1, file: !1, line: 1, type: !9, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, variables: !2)
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!9 = !DISubroutineType(types: !10)
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!10 = !{!11}
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!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 32, align: 32)
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!12 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !13)
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!13 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_unsigned_char)
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!14 = !DILocation(line: 2, column: 5, scope: !8)
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!15 = distinct !DISubprogram(name: "fn2", scope: !1, file: !1, line: 4, type: !9, isLocal: false, isDefinition: true, scopeLine: 4, isOptimized: true, unit: !0, variables: !2)
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!16 = !DILocation(line: 5, column: 5, scope: !15)
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