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be reserved. The decision to reserve x18 is going to be made solely by the front-end, so it isn't necessary to check if the OS is Darwin in the backend. llvm-svn: 243308
28 lines
975 B
LLVM
28 lines
975 B
LLVM
; RUN: llc -mtriple=arm64-apple-ios -mattr=+reserve-x18 -o - %s | FileCheck %s --check-prefix=CHECK-RESERVE-X18
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; RUN: llc -mtriple=arm64-freebsd-gnu -mattr=+reserve-x18 -o - %s | FileCheck %s --check-prefix=CHECK-RESERVE-X18
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; RUN: llc -mtriple=arm64-linux-gnu -o - %s | FileCheck %s
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; x18 is reserved as a platform register on Darwin but not on other
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; systems. Create loads of register pressure and make sure this is respected.
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; Also, fp must always refer to a valid frame record, even if it's not the one
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; of the current function, so it shouldn't be used either.
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@var = global [30 x i64] zeroinitializer
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define void @keep_live() {
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%val = load volatile [30 x i64], [30 x i64]* @var
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store volatile [30 x i64] %val, [30 x i64]* @var
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; CHECK: ldr x18
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; CHECK: str x18
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; CHECK-RESERVE-X18-NOT: ldr fp
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; CHECK-RESERVE-X18-NOT: ldr x18
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; CHECK-RESERVE-X18: Spill
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; CHECK-RESERVE-X18-NOT: ldr fp
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; CHECK-RESERVE-X18-NOT: ldr x18
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; CHECK-RESERVE-X18: ret
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ret void
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}
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