1 ; RUN: llc -mtriple=arm64-apple-ios -mattr=+reserve-x18 -o - %s | FileCheck %s --check-prefix=CHECK-RESERVE-X18 2 ; RUN: llc -mtriple=arm64-freebsd-gnu -mattr=+reserve-x18 -o - %s | FileCheck %s --check-prefix=CHECK-RESERVE-X18 3 ; RUN: llc -mtriple=arm64-linux-gnu -o - %s | FileCheck %s 4 5 ; x18 is reserved as a platform register on Darwin but not on other 6 ; systems. Create loads of register pressure and make sure this is respected. 7 8 ; Also, fp must always refer to a valid frame record, even if it's not the one 9 ; of the current function, so it shouldn't be used either. 10 11 @var = global [30 x i64] zeroinitializer 12 13 define void @keep_live() { 14 %val = load volatile [30 x i64], [30 x i64]* @var 15 store volatile [30 x i64] %val, [30 x i64]* @var 16 17 ; CHECK: ldr x18 18 ; CHECK: str x18 19 20 ; CHECK-RESERVE-X18-NOT: ldr fp 21 ; CHECK-RESERVE-X18-NOT: ldr x18 22 ; CHECK-RESERVE-X18: Spill 23 ; CHECK-RESERVE-X18-NOT: ldr fp 24 ; CHECK-RESERVE-X18-NOT: ldr x18 25 ; CHECK-RESERVE-X18: ret 26 ret void 27 } 28
