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[compiler-rt][AArch64] NFCI: Simplify __arm_get_current_vg. #119210

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merged 1 commit into from
Dec 10, 2024
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[compiler-rt][AArch64] NFCI: Simplify __arm_get_current_vg. #119210

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37 changes: 10 additions & 27 deletions compiler-rt/lib/builtins/aarch64/sme-abi.S
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,8 @@

#include "../assembly.h"

.set FEAT_SVE_BIT, 30
.set SVCR_PSTATE_SM_BIT, 0

#if !defined(__APPLE__)
#define TPIDR2_SYMBOL SYMBOL_NAME(__aarch64_has_sme_and_tpidr2_el0)
Expand Down Expand Up @@ -188,39 +190,20 @@ DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(__arm_get_current_vg)
.variant_pcs __arm_get_current_vg
BTI_C

stp x29, x30, [sp, #-16]!
.cfi_def_cfa_offset 16
mov x29, sp
.cfi_def_cfa w29, 16
.cfi_offset w30, -8
.cfi_offset w29, -16
adrp x17, CPU_FEATS_SYMBOL
ldr w17, [x17, CPU_FEATS_SYMBOL_OFFSET]
tbnz w17, #30, 0f
adrp x16, TPIDR2_SYMBOL
ldrb w16, [x16, TPIDR2_SYMBOL_OFFSET]
cbz w16, 1f
tbnz w17, #FEAT_SVE_BIT, 1f
adrp x17, TPIDR2_SYMBOL
ldrb w17, [x17, TPIDR2_SYMBOL_OFFSET]
cbz x17, 2f
0:
mov x18, x1
bl __arm_sme_state
mov x1, x18
and x17, x17, #0x40000000
bfxil x17, x0, #0, #1
cbz x17, 1f
mrs x17, SVCR
tbz x17, #SVCR_PSTATE_SM_BIT, 2f
1:
cntd x0
.cfi_def_cfa wsp, 16
ldp x29, x30, [sp], #16
.cfi_def_cfa_offset 0
.cfi_restore w30
.cfi_restore w29
ret
1:
2:
mov x0, xzr
.cfi_def_cfa wsp, 16
ldp x29, x30, [sp], #16
.cfi_def_cfa_offset 0
.cfi_restore w30
.cfi_restore w29
ret
END_COMPILERRT_OUTLINE_FUNCTION(__arm_get_current_vg)

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