honggyu.kim added a comment.
I see the difference now.
Below is the originally generated IR without this patch. It shows `\01`
clearly in `call void @"\01__gnu_mcount_nc"()`.
$ clang -target armv7-unknown-none-eabi -pg -meabi gnu -S -emit-llvm -o -
test-mcount.c
; ModuleID = 'mcount.c'
source_filename = "mcount.c"
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "armv7-unknown-none-eabi"
; Function Attrs: nounwind
define i32 @f() #0 {
call void @"\01__gnu_mcount_nc"() #1
ret i32 0
}
declare void @"\01__gnu_mcount_nc"()
attributes #0 = { nounwind "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"
"no-signed-zeros-fp-math"="false" "stack-protector-buffer-size"="8"
"target-cpu"="cortex-a8" "target-features"="+dsp,+neon,+strict-align,+vfp3"
"unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind }
...
Here is the IR result with this patch. But it doesn't show `\01` in front of
__gnu_mcount_nc in attribute list. It shows only
`"counting-function"="__gnu_mcount_nc"` here but if I dump the output into a
file then open it, it shows as `"counting-function"="^A__gnu_mcount_nc"`. Maybe
there's some mishandling of `\01` prefix whiling passing string that I didn't
find yet.
$ clang -target armv7-unknown-none-eabi -pg -meabi gnu -S -emit-llvm -o -
test-mcount.c
; ModuleID = 'mcount.c'
source_filename = "mcount.c"
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "armv7-unknown-none-eabi"
; Function Attrs: nounwind
define i32 @f() #0 {
ret i32 0
}
attributes #0 = { nounwind "counting-function"="__gnu_mcount_nc"
"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"
"no-signed-zeros-fp-math"="false" "stack-protector-buffer-size"="8"
"target-cpu"="cortex-a8" "target-features"="+dsp,+neon,+strict-align,+vfp3"
"unsafe-fp-math"="false" "use-soft-float"="false" }
...
https://reviews.llvm.org/D22666
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