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[lld-macho] Enable Linker Optimization Hints pass for arm64_32 (#148964)

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The backend emits `.loh` directives for arm64_32 as well. Our pass
already handles 32-bit pointer loads correctly (there was an extraneous
sanity check for 8-byte pointer sizes, I removed that here), so we can
enable them for all arm64 subtargets, including our upcoming arm64e
support.
This commit is contained in:
Daniel Bertalan 2025-07-16 21:29:48 +02:00 committed by GitHub
parent 362594a10f
commit 43f10639a1
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3 changed files with 66 additions and 4 deletions
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3
lld/MachO/LinkerOptimizationHints.cpp
View File

@ -351,9 +351,6 @@ static void applyAdrpLdrGotLdr(uint8_t *buf, const ConcatInputSection *isec,
return;
if (ldr3.baseRegister != ldr2.destRegister)
return;
// Loads from the GOT must be pointer sized.
if (ldr2.p2Size != 3 || ldr2.isFloat)
return;
applyAdrpLdr(buf, isec, offset1, offset2);
}
}

3
lld/MachO/Writer.cpp
View File

@ -1210,7 +1210,8 @@ void Writer::writeSections() {
}
void Writer::applyOptimizationHints() {
if (config->arch() != AK_arm64 || config->ignoreOptimizationHints)
if (!is_contained({AK_arm64, AK_arm64e, AK_arm64_32}, config->arch()) ||
config->ignoreOptimizationHints)
return;
uint8_t *buf = buffer->getBufferStart();

64
lld/test/MachO/loh-arm64-32.s Normal file
View File

@ -0,0 +1,64 @@
# REQUIRES: aarch64
# RUN: llvm-mc -filetype=obj -triple=arm64_32-apple-watchos %s -o %t.o
# RUN: %lld-watchos -U _external %t.o -o %t
# RUN: llvm-objdump -d --macho %t | FileCheck %s
.text
.align 2
.globl _foo
_foo:
ret
.globl _bar
_bar:
ret
.globl _main
_main:
# CHECK-LABEL: _main:
L1: adrp x0, _foo@PAGE
L2: add x0, x0, _foo@PAGEOFF
# CHECK-NEXT: adr x0
# CHECK-NEXT: nop
L3: adrp x0, _ptr@PAGE
L4: add x1, x0, _ptr@PAGEOFF
L5: ldr x2, [x1]
# CHECK-NEXT: nop
# CHECK-NEXT: nop
# CHECK-NEXT: ldr x2
L6: adrp x0, _foo@PAGE
L7: adrp x0, _bar@PAGE
# CHECK-NEXT: adrp x0
# CHECK-NEXT: nop
L8: adrp x0, _ptr@PAGE
L9: ldr x0, [x0, _ptr@PAGEOFF]
# CHECK-NEXT: nop
# CHECK-NEXT: ldr x0
L10: adrp x0, _ptr@PAGE
L11: ldr w0, [x0, _ptr@PAGEOFF]
# CHECK-NEXT: nop
# CHECK-NEXT: ldr w0, _ptr
L12: adrp x0, _external@PAGE
L13: ldr w1, [x0, _external@PAGEOFF]
L14: ldr x2, [x1]
# CHECK-NEXT: nop
# CHECK-NEXT: ldr w1, 0x{{.*}}
# CHECK-NEXT: ldr x2, [x1]
.data
.align 4
_ptr:
.quad 0
.loh AdrpAdd L1, L2
.loh AdrpAddLdr L3, L4, L5
.loh AdrpAdrp L6, L7
.loh AdrpLdr L8, L9
.loh AdrpLdrGot L10, L11
.loh AdrpLdrGotLdr L12, L13, L14