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b950dd0a32
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).
llvm-svn: 281213
100 lines
3.4 KiB
LLVM
100 lines
3.4 KiB
LLVM
; RUN: llc -relocation-model=static < %s | FileCheck %s
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; RUN: llc -relocation-model=pic < %s | FileCheck %s
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; RUN: llc -relocation-model=ropi < %s | FileCheck %s
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; RUN: llc -relocation-model=rwpi < %s | FileCheck %s
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-n32-S64"
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target triple = "armv7--linux-gnueabihf"
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@.str = private unnamed_addr constant [2 x i8] c"s\00", align 1
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@.str1 = private unnamed_addr constant [69 x i8] c"this string is far too long to fit in a literal pool by far and away\00", align 1
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@.str2 = private unnamed_addr constant [27 x i8] c"this string is just right!\00", align 1
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@.str3 = private unnamed_addr constant [26 x i8] c"this string is used twice\00", align 1
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@.str4 = private unnamed_addr constant [29 x i8] c"same string in two functions\00", align 1
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@.arr1 = private unnamed_addr constant [2 x i16] [i16 3, i16 4], align 2
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; CHECK-LABEL: @test1
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; CHECK: adr r0, [[x:.*]]
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; CHECK: [[x]]:
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; CHECK: .asciz "s\000\000"
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define void @test1() #0 {
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tail call void @a(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i32 0, i32 0)) #2
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ret void
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}
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declare void @a(i8*) #1
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; CHECK-LABEL: @test2
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; CHECK-NOT: .asci
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; CHECK: .fnend
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define void @test2() #0 {
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tail call void @a(i8* getelementptr inbounds ([69 x i8], [69 x i8]* @.str1, i32 0, i32 0)) #2
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ret void
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}
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; CHECK-LABEL: @test3
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; CHECK: adr r0, [[x:.*]]
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; CHECK: [[x]]:
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; CHECK: .asciz "this string is just right!\000"
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define void @test3() #0 {
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tail call void @a(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str2, i32 0, i32 0)) #2
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ret void
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}
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; CHECK-LABEL: @test4
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; CHECK: adr r{{.*}}, [[x:.*]]
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; CHECK: [[x]]:
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; CHECK: .asciz "this string is used twice\000\000"
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define void @test4() #0 {
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tail call void @a(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str3, i32 0, i32 0)) #2
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tail call void @a(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str3, i32 0, i32 0)) #2
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ret void
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}
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; CHECK-LABEL: @test5a
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; CHECK-NOT: adr
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define void @test5a() #0 {
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tail call void @a(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str4, i32 0, i32 0)) #2
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ret void
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}
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define void @test5b() #0 {
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tail call void @b(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str4, i32 0, i32 0)) #2
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ret void
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}
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; CHECK-LABEL: @test6a
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; CHECK: adr r0, [[x:.*]]
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; CHECK: [[x]]:
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; CHECK: .short 3
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; CHECK: .short 4
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define void @test6a() #0 {
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tail call void @c(i16* getelementptr inbounds ([2 x i16], [2 x i16]* @.arr1, i32 0, i32 0)) #2
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ret void
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}
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; CHECK-LABEL: @test6b
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; CHECK: adr r0, [[x:.*]]
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; CHECK: [[x]]:
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; CHECK: .short 3
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; CHECK: .short 4
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define void @test6b() #0 {
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tail call void @c(i16* getelementptr inbounds ([2 x i16], [2 x i16]* @.arr1, i32 0, i32 0)) #2
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ret void
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}
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declare void @b(i8*) #1
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declare void @c(i16*) #1
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attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #2 = { nounwind }
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!llvm.module.flags = !{!0, !1}
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!llvm.ident = !{!2}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = !{i32 1, !"min_enum_size", i32 4}
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!2 = !{!"Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)"}
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