355898a6ce
This PR enables the option `-fpatchable-function-entry` for SystemZ. It utilizes existing common code and just adds the emission of nops after the function label in the backend. SystemZ provides multiple nop options of varying length, making the semantics of this option somewhat ambiguous. In order to align with what `gcc` does with that same option, we#re choosing `nopr` as the canoonical nop for this purpose. For test, this adapts an existing test file from aarch64.
103 lines
3.5 KiB
LLVM
103 lines
3.5 KiB
LLVM
; RUN: llc -mtriple=s390x-ibm-linux %s -o - | FileCheck %s
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; RUN: llc -mtriple=s390x-ibm-linux -function-sections %s -o - | FileCheck %s
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; RUN: llc -mtriple=s390x-ibm-linux -function-sections %s -o - | FileCheck %s
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; RUN: llc -mtriple=s390x-ibm-linux -no-integrated-as -binutils-version=2.35 %s -o - | FileCheck --check-prefix=NOLINK %s
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; RUN: llc -mtriple=s390x-ibm-linux -no-integrated-as -binutils-version=2.36 %s -o - | FileCheck %s
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;; GNU ld < 2.36 did not support mixed SHF_LINK_ORDER and non-SHF_LINK_ORDER sections.
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; NOLINK-NOT: "awo"
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define i32 @f0() "patchable-function-entry"="0" {
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; CHECK-LABEL: f0:
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; CHECK-NEXT: .Lfunc_begin0:
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; CHECK-NOT: nopr
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; CHECK: lhi %r2, 0
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; CHECK-NOT: .section __patchable_function_entries
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ret i32 0
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}
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define i32 @f1() "patchable-function-entry"="1" {
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; CHECK-LABEL: f1:
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; CHECK-NEXT: .Lfunc_begin1:
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; CHECK: nopr
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; CHECK-NEXT: lhi %r2, 0
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; CHECK: .section __patchable_function_entries,"awo",@progbits,f1{{$}}
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; CHECK-NEXT: .p2align 3, 0x0
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; CHECK-NEXT: .quad .Lfunc_begin1
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ret i32 0
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}
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;; Without -function-sections, f2 is in the same text section as f1.
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;; They share the __patchable_function_entries section.
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;; With -function-sections, f1 and f2 are in different text sections.
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;; Use separate __patchable_function_entries.
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define void @f2() "patchable-function-entry"="2" {
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; CHECK-LABEL: f2:
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; CHECK-NEXT: .Lfunc_begin2:
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; CHECK-COUNT-2: nopr
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; CHECK-NEXT: br %r14
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; CHECK: .section __patchable_function_entries,"awo",@progbits,f2{{$}}
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; CHECK-NEXT: .p2align 3, 0x0
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; CHECK-NEXT: .quad .Lfunc_begin2
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ret void
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}
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$f3 = comdat any
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define void @f3() "patchable-function-entry"="3" comdat {
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; CHECK-LABEL: f3:
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; CHECK-NEXT: .Lfunc_begin3:
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; CHECK-COUNT-3: nopr
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; CHECK-NEXT: br %r14
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; CHECK: .section __patchable_function_entries,"awoG",@progbits,f3,f3,comdat{{$}}
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; CHECK-NEXT: .p2align 3, 0x0
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; CHECK-NEXT: .quad .Lfunc_begin3
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ret void
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}
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$f5 = comdat any
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define void @f5() "patchable-function-entry"="5" comdat {
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; CHECK-LABEL: f5:
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; CHECK-NEXT: .Lfunc_begin4:
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; CHECK-COUNT-5: nopr
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; CHECK-NEXT: aghi %r15, -176
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; CHECK: .section __patchable_function_entries,"awoG",@progbits,f5,f5,comdat{{$}}
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; CHECK: .p2align 3, 0x0
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; CHECK-NEXT: .quad .Lfunc_begin4
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%frame = alloca i8, i32 16
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ret void
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}
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;; -fpatchable-function-entry=3,2
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;; "patchable-function-prefix" emits data before the function entry label.
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define void @f3_2() "patchable-function-entry"="1" "patchable-function-prefix"="2" {
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; CHECK-LABEL: .type f3_2,@function
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; CHECK-NEXT: .Ltmp0:
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; CHECK-NEXT: nopr
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; CHECK-NEXT: nopr
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; CHECK-NEXT: f3_2: # @f3_2
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; CHECK: # %bb.0:
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; CHECK-NEXT: nopr
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; CHECK-NEXT: br %r14
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;; .size does not include the prefix.
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; CHECK: .Lfunc_end5:
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; CHECK-NEXT: .size f3_2, .Lfunc_end5-f3_2
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; CHECK: .section __patchable_function_entries,"awo",@progbits,f3_2{{$}}
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; CHECK: .p2align 3, 0x0
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; CHECK-NEXT: .quad .Ltmp0
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ret void
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}
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;; When prefix data is used, arbitrarily place noprs after prefix data.
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define void @prefix() "patchable-function-entry"="0" "patchable-function-prefix"="1" prefix i32 1 {
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; CHECK-LABEL: .type prefix,@function
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; CHECK-NEXT: .long 1 # 0x1
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; CHECK: .Ltmp1:
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; CHECK: nopr
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; CHECK-NEXT: prefix: # @prefix
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;; Emit a __patchable_function_entries entry even if "patchable-function-entry" is 0.
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; CHECK: .section __patchable_function_entries,"awo",@progbits,prefix{{$}}
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; CHECK: .p2align 3, 0x0
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; CHECK-NEXT: .quad .Ltmp1
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ret void
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}
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