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[compiler-rt][AArch64] Don't use x18 in __arm_sme_save #157802

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Merged
merged 1 commit into from
Sep 12, 2025
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[compiler-rt][AArch64] Don't use x18 in __arm_sme_save #157802

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10 changes: 5 additions & 5 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 @@ -280,17 +280,17 @@ DEFINE_COMPILERRT_FUNCTION(__arm_sme_save)
mov w16, #1
str x16, [x0]

add x18, x0, #32
add x16, x0, #32
tbz x17, #FEAT_SME2_BIT, 1f

// Store ZT0
str zt0, [x18]
add x18, x18, #64
str zt0, [x16]
add x16, x16, #64

1:
// Set up lazy-save (x18 = pointer to buffer)
// Set up lazy-save (x16 = pointer to buffer)
rdsvl x17, #1
str x18, [x0, #16]!
str x16, [x0, #16]!
strh w17, [x0, #8]
strh wzr, [x0, #10]
str wzr, [x0, #12]
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