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Introduce MCAsmInfo::UsesSetToEquateSymbol and prefer = to .set #142289

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Merged
merged 2 commits into from
Jun 12, 2025
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Introduce MCAsmInfo::UsesSetToEquateSymbol and prefer = to .set #142289

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3497280
[𝘀𝗽𝗿] initial version
MaskRay May 31, 2025
51691d0
fix tests
MaskRay May 31, 2025
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6 changes: 3 additions & 3 deletions clang/test/CodeGen/alias.c
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Expand Up @@ -29,20 +29,20 @@ const int wacom_usb_ids[] = {1, 1, 2, 3, 5, 8, 13, 0};
extern const int __mod_usb_device_table __attribute__ ((alias("wacom_usb_ids")));
// CHECKBASIC-DAG: @__mod_usb_device_table ={{.*}} alias i32, ptr @wacom_usb_ids
// CHECKASM-DAG: .globl __mod_usb_device_table
// CHECKASM-DAG: .set __mod_usb_device_table, wacom_usb_ids
// CHECKASM-DAG: __mod_usb_device_table = wacom_usb_ids
// CHECKASM-NOT: .size __mod_usb_device_table

extern int g1;
extern int g1 __attribute((alias("g0")));
// CHECKBASIC-DAG: @g1 ={{.*}} alias i32, ptr @g0
// CHECKASM-DAG: .globl g1
// CHECKASM-DAG: .set g1, g0
// CHECKASM-DAG: g1 = g0
// CHECKASM-NOT: .size g1

extern __thread int __libc_errno __attribute__ ((alias ("TL_WITH_ALIAS")));
// CHECKBASIC-DAG: @__libc_errno ={{.*}} thread_local alias i32, ptr @TL_WITH_ALIAS
// CHECKASM-DAG: .globl __libc_errno
// CHECKASM-DAG: .set __libc_errno, TL_WITH_ALIAS
// CHECKASM-DAG: __libc_errno = TL_WITH_ALIAS
// CHECKASM-NOT: .size __libc_errno

void f0(void) { }
Expand Down
4 changes: 4 additions & 0 deletions llvm/include/llvm/MC/MCAsmInfo.h
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Expand Up @@ -140,6 +140,9 @@ class MCAsmInfo {
/// This is appended to emitted labels. Defaults to ":"
const char *LabelSuffix;

/// Use .set instead of = to equate a symbol to an expression.
bool UsesSetToEquateSymbol = false;

// Print the EH begin symbol with an assignment. Defaults to false.
bool UseAssignmentForEHBegin = false;

Expand Down Expand Up @@ -520,6 +523,7 @@ class MCAsmInfo {
bool shouldAllowAdditionalComments() const { return AllowAdditionalComments; }
const char *getLabelSuffix() const { return LabelSuffix; }

bool usesSetToEquateSymbol() const { return UsesSetToEquateSymbol; }
bool useAssignmentForEHBegin() const { return UseAssignmentForEHBegin; }
bool needsLocalForSize() const { return NeedsLocalForSize; }
StringRef getPrivateGlobalPrefix() const { return PrivateGlobalPrefix; }
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6 changes: 4 additions & 2 deletions llvm/lib/MC/MCAsmStreamer.cpp
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Expand Up @@ -695,9 +695,11 @@ void MCAsmStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
if (E->inlineAssignedExpr())
EmitSet = false;
if (EmitSet) {
OS << ".set ";
bool UseSet = MAI->usesSetToEquateSymbol();
if (UseSet)
OS << ".set ";
Symbol->print(OS, MAI);
OS << ", ";
OS << (UseSet ? ", " : " = ");
Value->print(OS, MAI);

EmitEOL();
Expand Down
1 change: 1 addition & 0 deletions llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUMCAsmInfo.cpp
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Expand Up @@ -42,6 +42,7 @@ AMDGPUMCAsmInfo::AMDGPUMCAsmInfo(const Triple &TT,
CommentString = ";";
InlineAsmStart = ";#ASMSTART";
InlineAsmEnd = ";#ASMEND";
UsesSetToEquateSymbol = true;

//===--- Data Emission Directives -------------------------------------===//
UsesELFSectionDirectiveForBSS = true;
Expand Down
1 change: 1 addition & 0 deletions llvm/lib/Target/Hexagon/MCTargetDesc/HexagonMCAsmInfo.cpp
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Expand Up @@ -38,6 +38,7 @@ HexagonMCAsmInfo::HexagonMCAsmInfo(const Triple &TT) {
LCOMMDirectiveAlignmentType = LCOMM::ByteAlignment;
InlineAsmStart = "# InlineAsm Start";
InlineAsmEnd = "# InlineAsm End";
UsesSetToEquateSymbol = true;
ZeroDirective = "\t.space\t";
AscizDirective = "\t.string\t";

Expand Down
2 changes: 2 additions & 0 deletions llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCAsmInfo.cpp
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Expand Up @@ -155,5 +155,7 @@ PPCXCOFFMCAsmInfo::PPCXCOFFMCAsmInfo(bool Is64Bit, const Triple &T) {
// Support $ as PC in inline asm
DollarIsPC = true;

UsesSetToEquateSymbol = true;

initializeVariantKinds(variantKindDescs);
}
1 change: 1 addition & 0 deletions llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCAsmInfo.cpp
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Expand Up @@ -49,6 +49,7 @@ SystemZMCAsmInfoGOFF::SystemZMCAsmInfoGOFF(const Triple &TT) {
CalleeSaveStackSlotSize = 8;
CodePointerSize = 8;
CommentString = "*";
UsesSetToEquateSymbol = true;
ExceptionsType = ExceptionHandling::ZOS;
IsHLASM = true;
IsLittleEndian = false;
Expand Down
14 changes: 7 additions & 7 deletions llvm/test/CodeGen/AArch64/arm64ec-alias.ll
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Expand Up @@ -13,30 +13,30 @@ define dso_local void @patchable_func() hybrid_patchable {
@patchable_alias = alias void (), ptr @patchable_func

; CHECK: .weak_anti_dep func_alias
; CHECK-NEXT: .set func_alias, "#func_alias"
; CHECK-NEXT: func_alias = "#func_alias"
; CHECK-NEXT: .weak_anti_dep func_alias2
; CHECK-NEXT: .set func_alias2, "#func_alias2"
; CHECK-NEXT: func_alias2 = "#func_alias2"
; CHECK-NEXT: .weak_anti_dep func
; CHECK-NEXT: .set func, "#func"
; CHECK-NEXT: func = "#func"
; CHECK: .weak_anti_dep patchable_alias
; CHECK-NEXT: .set patchable_alias, "#patchable_alias"
; CHECK-NEXT: patchable_alias = "#patchable_alias"

; CHECK: .globl "#func_alias"
; CHECK-NEXT: .def "#func_alias";
; CHECK-NEXT: .scl 2;
; CHECK-NEXT: .type 32;
; CHECK-NEXT: .endef
; CHECK-NEXT: .set "#func_alias", "#func"
; CHECK-NEXT: "#func_alias" = "#func"
; CHECK-NEXT: .globl "#func_alias2"
; CHECK-NEXT: .def "#func_alias2";
; CHECK-NEXT: .scl 2;
; CHECK-NEXT: .type 32;
; CHECK-NEXT: .endef
; CHECK-NEXT: .set "#func_alias2", "#func_alias"
; CHECK-NEXT: "#func_alias2" = "#func_alias"

; CHECK: .globl "#patchable_alias"
; CHECK-NEXT: .def "#patchable_alias";
; CHECK-NEXT: .scl 2;
; CHECK-NEXT: .type 32;
; CHECK-NEXT: .endef
; CHECK-NEXT: .set "#patchable_alias", "#patchable_func"
; CHECK-NEXT: "#patchable_alias" = "#patchable_func"
18 changes: 9 additions & 9 deletions llvm/test/CodeGen/AArch64/arm64ec-hybrid-patchable.ll
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Expand Up @@ -76,7 +76,7 @@ define dso_local void @caller() nounwind {
; CHECK-NEXT: .p2align 2
; CHECK-NEXT: "#caller": // @"#caller"
; CHECK-NEXT: .weak_anti_dep caller
; CHECK-NEXT: .set caller, "#caller"{{$}}
; CHECK-NEXT: caller = "#caller"{{$}}
; CHECK-NEXT: // %bb.0:
; CHECK-NEXT: str x30, [sp, #-16]! // 8-byte Folded Spill
; CHECK-NEXT: bl "#func"
Expand Down Expand Up @@ -253,13 +253,13 @@ define dso_local void @caller() nounwind {
; CHECK-NEXT: .type 32;
; CHECK-NEXT: .endef
; CHECK-NEXT: .weak func
; CHECK-NEXT: .set func, "EXP+#func"{{$}}
; CHECK-NEXT: func = "EXP+#func"{{$}}
; CHECK-NEXT: .weak "#func"
; CHECK-NEXT: .def "#func";
; CHECK-NEXT: .scl 2;
; CHECK-NEXT: .type 32;
; CHECK-NEXT: .endef
; CHECK-NEXT: .set "#func", "#func$hybpatch_thunk"{{$}}
; CHECK-NEXT: "#func" = "#func$hybpatch_thunk"{{$}}
; CHECK-NEXT: .def "EXP+#has_varargs";
; CHECK-NEXT: .scl 2;
; CHECK-NEXT: .type 32;
Expand All @@ -269,13 +269,13 @@ define dso_local void @caller() nounwind {
; CHECK-NEXT: .type 32;
; CHECK-NEXT: .endef
; CHECK-NEXT: .weak has_varargs
; CHECK-NEXT: .set has_varargs, "EXP+#has_varargs"
; CHECK-NEXT: has_varargs = "EXP+#has_varargs"
; CHECK-NEXT: .weak "#has_varargs"
; CHECK-NEXT: .def "#has_varargs";
; CHECK-NEXT: .scl 2;
; CHECK-NEXT: .type 32;
; CHECK-NEXT: .endef
; CHECK-NEXT: .set "#has_varargs", "#has_varargs$hybpatch_thunk"
; CHECK-NEXT: "#has_varargs" = "#has_varargs$hybpatch_thunk"
; CHECK-NEXT: .def "EXP+#has_sret";
; CHECK-NEXT: .scl 2;
; CHECK-NEXT: .type 32;
Expand All @@ -285,13 +285,13 @@ define dso_local void @caller() nounwind {
; CHECK-NEXT: .type 32;
; CHECK-NEXT: .endef
; CHECK-NEXT: .weak has_sret
; CHECK-NEXT: .set has_sret, "EXP+#has_sret"
; CHECK-NEXT: has_sret = "EXP+#has_sret"
; CHECK-NEXT: .weak "#has_sret"
; CHECK-NEXT: .def "#has_sret";
; CHECK-NEXT: .scl 2;
; CHECK-NEXT: .type 32;
; CHECK-NEXT: .endef
; CHECK-NEXT: .set "#has_sret", "#has_sret$hybpatch_thunk"
; CHECK-NEXT: "#has_sret" = "#has_sret$hybpatch_thunk"
; CHECK-NEXT: .def "EXP+#exp";
; CHECK-NEXT: .scl 2;
; CHECK-NEXT: .type 32;
Expand All @@ -301,13 +301,13 @@ define dso_local void @caller() nounwind {
; CHECK-NEXT: .type 32;
; CHECK-NEXT: .endef
; CHECK-NEXT: .weak exp
; CHECK-NEXT: .set exp, "EXP+#exp"
; CHECK-NEXT: exp = "EXP+#exp"
; CHECK-NEXT: .weak "#exp"
; CHECK-NEXT: .def "#exp";
; CHECK-NEXT: .scl 2;
; CHECK-NEXT: .type 32;
; CHECK-NEXT: .endef
; CHECK-NEXT: .set "#exp", "#exp$hybpatch_thunk"
; CHECK-NEXT: "#exp" = "#exp$hybpatch_thunk"

; SYM: [53](sec 15)(fl 0x00)(ty 20)(scl 2) (nx 0) 0x00000000 #func$hybpatch_thunk
; SYM: [58](sec 16)(fl 0x00)(ty 20)(scl 2) (nx 0) 0x00000000 #has_varargs$hybpatch_thunk
Expand Down
6 changes: 3 additions & 3 deletions llvm/test/CodeGen/AArch64/arm64ec-symbols.ll
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Expand Up @@ -10,12 +10,12 @@ define void @caller() nounwind {
}

; CHECK: .weak_anti_dep caller
; CHECK-NEXT: .set caller, "#caller"{{$}}
; CHECK-NEXT: caller = "#caller"{{$}}

; CHECK: .weak_anti_dep func
; CHECK-NEXT: .set func, "#func"{{$}}
; CHECK-NEXT: func = "#func"{{$}}
; CHECK-NEXT: .weak_anti_dep "#func"
; CHECK-NEXT: .set "#func", "#func$exit_thunk"{{$}}
; CHECK-NEXT: "#func" = "#func$exit_thunk"{{$}}

; SYM: [ 8](sec 4)(fl 0x00)(ty 20)(scl 2) (nx 0) 0x00000000 #caller
; SYM: [21](sec 7)(fl 0x00)(ty 20)(scl 2) (nx 0) 0x00000000 #func$exit_thunk
Expand Down
16 changes: 8 additions & 8 deletions llvm/test/CodeGen/AArch64/arm64ec-varargs.ll
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Expand Up @@ -45,9 +45,9 @@ define void @varargs_caller() nounwind {
; CHECK-NEXT: stp x9, x8, [sp]
; CHECK-NEXT: str xzr, [sp, #16]
; CHECK-NEXT: .weak_anti_dep varargs_callee
; CHECK-NEXT: .set varargs_callee, "#varargs_callee"
; CHECK-NEXT: varargs_callee = "#varargs_callee"
; CHECK-NEXT: .weak_anti_dep "#varargs_callee"
; CHECK-NEXT: .set "#varargs_callee", varargs_callee
; CHECK-NEXT: "#varargs_callee" = varargs_callee
; CHECK-NEXT: bl "#varargs_callee"
; CHECK-NEXT: ldr x30, [sp, #32] // 8-byte Folded Reload
; CHECK-NEXT: add sp, sp, #48
Expand Down Expand Up @@ -86,9 +86,9 @@ define void @varargs_many_argscalleer() nounwind {
; CHECK-NEXT: stp x9, x8, [sp]
; CHECK-NEXT: stp q0, q0, [sp, #16]
; CHECK-NEXT: .weak_anti_dep varargs_many_argscallee
; CHECK-NEXT: .set varargs_many_argscallee, "#varargs_many_argscallee"
; CHECK-NEXT: varargs_many_argscallee = "#varargs_many_argscallee"
; CHECK-NEXT: .weak_anti_dep "#varargs_many_argscallee"
; CHECK-NEXT: .set "#varargs_many_argscallee", varargs_many_argscallee
; CHECK-NEXT: "#varargs_many_argscallee" = varargs_many_argscallee
; CHECK-NEXT: bl "#varargs_many_argscallee"
; CHECK-NEXT: ldr x30, [sp, #48] // 8-byte Folded Reload
; CHECK-NEXT: add sp, sp, #64
Expand Down Expand Up @@ -116,9 +116,9 @@ define void @varargs_caller_tail() nounwind {
; CHECK-NEXT: stp x9, x8, [sp]
; CHECK-NEXT: str xzr, [sp, #16]
; CHECK-NEXT: .weak_anti_dep varargs_callee
; CHECK-NEXT: .set varargs_callee, "#varargs_callee"
; CHECK-NEXT: varargs_callee = "#varargs_callee"
; CHECK-NEXT: .weak_anti_dep "#varargs_callee"
; CHECK-NEXT: .set "#varargs_callee", varargs_callee
; CHECK-NEXT: "#varargs_callee" = varargs_callee
; CHECK-NEXT: bl "#varargs_callee"
; CHECK-NEXT: ldr x30, [sp, #32] // 8-byte Folded Reload
; CHECK-NEXT: add x4, sp, #48
Expand All @@ -129,9 +129,9 @@ define void @varargs_caller_tail() nounwind {
; CHECK-NEXT: mov x5, xzr
; CHECK-NEXT: add sp, sp, #48
; CHECK-NEXT: .weak_anti_dep varargs_callee
; CHECK-NEXT: .set varargs_callee, "#varargs_callee"
; CHECK-NEXT: varargs_callee = "#varargs_callee"
; CHECK-NEXT: .weak_anti_dep "#varargs_callee"
; CHECK-NEXT: .set "#varargs_callee", varargs_callee
; CHECK-NEXT: "#varargs_callee" = varargs_callee
; CHECK-NEXT: b "#varargs_callee"
call void (double, ...) @varargs_callee(double 1.0, i32 2, double 3.0, i32 4, double 5.0, <2 x double> <double 0.0, double 0.0>)
tail call void (double, ...) @varargs_callee(double 1.0, i32 4, i32 3, i32 2)
Expand Down
2 changes: 1 addition & 1 deletion llvm/test/CodeGen/AArch64/ehcontguard.ll
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@@ -1,7 +1,7 @@
; RUN: llc < %s -mtriple=aarch64-windows | FileCheck %s
; EHCont Guard is currently only available on Windows

; CHECK: .set "@feat.00", 16384
; CHECK: "@feat.00" = 16384

; CHECK: .section .gehcont$y

Expand Down
8 changes: 4 additions & 4 deletions llvm/test/CodeGen/AArch64/global-merge-1.ll
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Expand Up @@ -23,9 +23,9 @@ define void @f1(i32 %a1, i32 %a2) {
;CHECK: .type .L_MergedGlobals,@object // @_MergedGlobals
;CHECK: .local .L_MergedGlobals
;CHECK: .comm .L_MergedGlobals,8,4
;CHECK: .set m, .L_MergedGlobals
;CHECK: .set n, .L_MergedGlobals+4
;CHECK: m = .L_MergedGlobals
;CHECK: n = .L_MergedGlobals+4

;CHECK-APPLE-IOS: .zerofill __DATA,__bss,__MergedGlobals,8,2 ; @_MergedGlobals
;CHECK-APPLE-IOS-NOT: .set _m, l__MergedGlobals
;CHECK-APPLE-IOS-NOT: .set _n, l__MergedGlobals+4
;CHECK-APPLE-IOS-NOT: _m = l__MergedGlobals
;CHECK-APPLE-IOS-NOT: _n = l__MergedGlobals+4
12 changes: 6 additions & 6 deletions llvm/test/CodeGen/AArch64/global-merge-2.ll
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Expand Up @@ -32,21 +32,21 @@ define dso_local void @g1(i32 %a1, i32 %a2) {
;CHECK: .comm .L_MergedGlobals,12,4

;CHECK: .globl x
;CHECK: .set x, .L_MergedGlobals
;CHECK: x = .L_MergedGlobals
;CHECK: .size x, 4
;CHECK: .globl y
;CHECK: .set y, .L_MergedGlobals+4
;CHECK: y = .L_MergedGlobals+4
;CHECK: .size y, 4
;CHECK: .globl z
;CHECK: .set z, .L_MergedGlobals+8
;CHECK: z = .L_MergedGlobals+8
;CHECK: .size z, 4

;CHECK-APPLE-IOS: .zerofill __DATA,__common,__MergedGlobals_x,12,2

;CHECK-APPLE-IOS: .globl _x
;CHECK-APPLE-IOS: .set {{.*}}, __MergedGlobals_x
;CHECK-APPLE-IOS: {{.*}} = __MergedGlobals_x
;CHECK-APPLE-IOS: .globl _y
;CHECK-APPLE-IOS: .set _y, __MergedGlobals_x+4
;CHECK-APPLE-IOS: _y = __MergedGlobals_x+4
;CHECK-APPLE-IOS: .globl _z
;CHECK-APPLE-IOS: .set _z, __MergedGlobals_x+8
;CHECK-APPLE-IOS: _z = __MergedGlobals_x+8
;CHECK-APPLE-IOS: .subsections_via_symbols
10 changes: 5 additions & 5 deletions llvm/test/CodeGen/AArch64/global-merge-3.ll
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Expand Up @@ -40,14 +40,14 @@ define dso_local void @f1(i32 %a1, i32 %a2, i32 %a3) {

;CHECK-APPLE-IOS: .globl __MergedGlobals_x
;CHECK-APPLE-IOS: .zerofill __DATA,__common,__MergedGlobals_x,800,2
;CHECK-APPLE-IOS: .set _x, __MergedGlobals_x
;CHECK-APPLE-IOS: .set _y, __MergedGlobals_x+400
;CHECK-APPLE-IOS: _x = __MergedGlobals_x
;CHECK-APPLE-IOS: _y = __MergedGlobals_x+400

;CHECK: .type .L_MergedGlobals,@object // @_MergedGlobals
;CHECK: .local .L_MergedGlobals
;CHECK: .comm .L_MergedGlobals,800,4
;CHECK: globl x
;CHECK: .set x, .L_MergedGlobals
;CHECK: x = .L_MergedGlobals
;CHECK: globl y
;CHECK: .set y, .L_MergedGlobals+400
;CHECK-NOT: .set z, .L_MergedGlobals
;CHECK: y = .L_MergedGlobals+400
;CHECK-NOT: z = .L_MergedGlobals
4 changes: 2 additions & 2 deletions llvm/test/CodeGen/AArch64/global-merge-hidden-minsize.ll
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Expand Up @@ -16,10 +16,10 @@ attributes #0 = { minsize optsize }

; CHECK: .globl x
; CHECK: .hidden x
; CHECK: .set x, .L_MergedGlobals
; CHECK: x = .L_MergedGlobals
; CHECK: .size x, 4

; CHECK: .globl y
; CHECK: .hidden y
; CHECK: .set y, .L_MergedGlobals+4
; CHECK: y = .L_MergedGlobals+4
; CHECK: .size y, 4
2 changes: 1 addition & 1 deletion llvm/test/CodeGen/AArch64/ifunc-asm.ll
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Expand Up @@ -16,7 +16,7 @@ entry:
@global_ifunc = ifunc i32 (i32), ptr @the_resolver
; ELF: .globl global_ifunc
; ELF-NEXT: .type global_ifunc,@gnu_indirect_function
; ELF-NEXT: .set global_ifunc, the_resolver
; ELF-NEXT: global_ifunc = the_resolver

; MACHO: .section __DATA,__data
; MACHO-NEXT: .p2align 3, 0x0
Expand Down
8 changes: 4 additions & 4 deletions llvm/test/CodeGen/AArch64/seh-finally.ll
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Expand Up @@ -38,7 +38,7 @@ entry:
; CHECK: add x29, sp, #16
; CHECK: mov x0, #-2
; CHECK: stur x0, [x29, #16]
; CHECK: .set .Lsimple_seh$frame_escape_0, -8
; CHECK: .Lsimple_seh$frame_escape_0 = -8
; CHECK: ldur w0, [x29, #-8]
; CHECK: bl foo

Expand Down Expand Up @@ -89,7 +89,7 @@ entry:
; CHECK: mov x19, sp
; CHECK: mov x0, #-2
; CHECK: stur x0, [x29, #24]
; CHECK: .set .Lstack_realign$frame_escape_0, 0
; CHECK: .Lstack_realign$frame_escape_0 = 0
; CHECK: ldr w0, [x19]
; CHECK: bl foo

Expand Down Expand Up @@ -137,7 +137,7 @@ entry:
; CHECK: add x29, sp, #32
; CHECK: mov x1, #-2
; CHECK: stur x1, [x29, #16]
; CHECK: .set .Lvla_present$frame_escape_0, -4
; CHECK: .Lvla_present$frame_escape_0 = -4
; CHECK: stur w0, [x29, #-4]
; CHECK: ldur w8, [x29, #-4]
; CHECK: mov x9, sp
Expand Down Expand Up @@ -204,7 +204,7 @@ entry:
; CHECK: mov x19, sp
; CHECK: mov x1, #-2
; CHECK: stur x1, [x29, #24]
; CHECK: .set .Lvla_and_realign$frame_escape_0, 32
; CHECK: .Lvla_and_realign$frame_escape_0 = 32
; CHECK: str w0, [x29, #36]
; CHECK: ldr w8, [x29, #36]
; CHECK: mov x9, sp
Expand Down
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