-
Notifications
You must be signed in to change notification settings - Fork 10.8k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
[X86] Add "Ws" constraint and "p" modifier for symbolic address/label…
… reference (#77886) Printing the raw symbol is useful in inline asm (e.g. getting the C++ mangled name, referencing a symbol in a custom way while ensuring it is not optimized out even if internal). Similar constraints are available in other targets (e.g. "S" for aarch64/riscv, "Cs" for m68k). ``` namespace ns { extern int var, a[4]; } void foo() { asm(".pushsection .xxx,\"aw\"; .dc.a %p0; .popsection" :: "Ws"(&ns::var)); asm(".reloc ., BFD_RELOC_NONE, %p0" :: "Ws"(&ns::a[3])); } ``` Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105576
- Loading branch information
Showing
8 changed files
with
115 additions
and
5 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,14 @@ | ||
; RUN: not llc -mtriple=x86_64 < %s 2>&1 | FileCheck %s | ||
|
||
@a = external global [4 x i32], align 16 | ||
|
||
; CHECK-COUNT-2: error: invalid operand for inline asm constraint 'Ws' | ||
; CHECK-NOT: error: | ||
define void @test(i64 %i) { | ||
entry: | ||
%x = alloca i32, align 4 | ||
%ai = getelementptr inbounds [4 x i32], ptr @a, i64 0, i64 %i | ||
call void asm sideeffect "", "^Ws,~{dirflag},~{fpsr},~{flags}"(ptr %x) | ||
call void asm sideeffect "", "^Ws,~{dirflag},~{fpsr},~{flags}"(ptr %ai) | ||
ret void | ||
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,36 @@ | ||
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py | ||
; RUN: llc -mtriple=i686 < %s | FileCheck %s | ||
; RUN: llc -mtriple=x86_64 < %s | FileCheck %s | ||
|
||
@var = external dso_local global i32, align 4 | ||
@a = external global [4 x i32], align 16 | ||
|
||
define dso_local void @test() { | ||
; CHECK-LABEL: test: | ||
; CHECK: # %bb.0: # %entry | ||
; CHECK-NEXT: #APP | ||
; CHECK-NEXT: # var a+12 test | ||
; CHECK-NEXT: #NO_APP | ||
; CHECK-NEXT: ret{{[l|q]}} | ||
entry: | ||
%ai = getelementptr inbounds [4 x i32], ptr @a, i64 0, i64 3 | ||
call void asm sideeffect "// ${0:p} ${1:p} ${2:p}", "^Ws,^Ws,^Ws,~{dirflag},~{fpsr},~{flags}"(ptr @var, ptr %ai, ptr @test) | ||
ret void | ||
} | ||
|
||
define dso_local void @test_label() { | ||
; CHECK-LABEL: test_label: | ||
; CHECK: # %bb.0: # %entry | ||
; CHECK-NEXT: .Ltmp0: # Block address taken | ||
; CHECK-NEXT: # %bb.1: # %label | ||
; CHECK-NEXT: #APP | ||
; CHECK-NEXT: # .Ltmp0 | ||
; CHECK-NEXT: #NO_APP | ||
; CHECK-NEXT: ret{{[l|q]}} | ||
entry: | ||
br label %label | ||
|
||
label: | ||
tail call void asm sideeffect "// ${0:p}", "^Ws,~{dirflag},~{fpsr},~{flags}"(ptr blockaddress(@test_label, %label)) | ||
ret void | ||
} |