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[AArch64] Add support for -ffixed-x30

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Add support for reserving LR in:

* the driver through `-ffixed-x30`
* cc1 through `-target-feature +reserve-x30`
* the backend through `-mattr=+reserve-x30`
* a subtarget feature `reserve-x30`

the same way we're doing for the other registers.
This commit is contained in:
Francis Visoiu Mistrih 2020-02-21 17:35:19 -08:00
parent f1c3132bc1
commit 0610a35114
2 changed files with 7 additions and 2 deletions
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2
lib/Target/AArch64/AArch64.td
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@ -142,7 +142,7 @@ def FeatureStrictAlign : SubtargetFeature<"strict-align",
"Disallow all unaligned memory "
"access">;
foreach i = {1-7,9-15,18,20-28} in
foreach i = {1-7,9-15,18,20-28,30} in
def FeatureReserveX#i : SubtargetFeature<"reserve-x"#i, "ReserveXRegister["#i#"]", "true",
"Reserve X"#i#", making it unavailable "
"as a GPR">;

7
test/CodeGen/AArch64/arm64-platform-reg.ll
View File

@ -29,6 +29,7 @@
; RUN: llc -mtriple=arm64-linux-gnu -mattr=+reserve-x26 -o - %s | FileCheck %s --check-prefixes=CHECK-RESERVE,CHECK-RESERVE-X26
; RUN: llc -mtriple=arm64-linux-gnu -mattr=+reserve-x27 -o - %s | FileCheck %s --check-prefixes=CHECK-RESERVE,CHECK-RESERVE-X27
; RUN: llc -mtriple=arm64-linux-gnu -mattr=+reserve-x28 -o - %s | FileCheck %s --check-prefixes=CHECK-RESERVE,CHECK-RESERVE-X28
; RUN: llc -mtriple=arm64-linux-gnu -mattr=+reserve-x30 -o - %s | FileCheck %s --check-prefixes=CHECK-RESERVE,CHECK-RESERVE-X30
; Test multiple of reserve-x# options together.
; RUN: llc -mtriple=arm64-linux-gnu \
@ -67,6 +68,7 @@
; RUN: -mattr=+reserve-x26 \
; RUN: -mattr=+reserve-x27 \
; RUN: -mattr=+reserve-x28 \
; RUN: -mattr=+reserve-x30 \
; RUN: -o - %s | FileCheck %s \
; RUN: --check-prefix=CHECK-RESERVE \
; RUN: --check-prefix=CHECK-RESERVE-X1 \
@ -92,7 +94,8 @@
; RUN: --check-prefix=CHECK-RESERVE-X25 \
; RUN: --check-prefix=CHECK-RESERVE-X26 \
; RUN: --check-prefix=CHECK-RESERVE-X27 \
; RUN: --check-prefix=CHECK-RESERVE-X28
; RUN: --check-prefix=CHECK-RESERVE-X28 \
; RUN: --check-prefix=CHECK-RESERVE-X30
; x18 is reserved as a platform register on Darwin but not on other
; systems. Create loads of register pressure and make sure this is respected.
@ -134,6 +137,7 @@ define void @keep_live() {
; CHECK-RESERVE-X26-NOT: ldr x26
; CHECK-RESERVE-X27-NOT: ldr x27
; CHECK-RESERVE-X28-NOT: ldr x28
; CHECK-RESERVE-X30-NOT: ldr x30
; CHECK-RESERVE: Spill
; CHECK-RESERVE-NOT: ldr fp
; CHECK-RESERVE-X1-NOT: ldr x1,
@ -160,6 +164,7 @@ define void @keep_live() {
; CHECK-RESERVE-X26-NOT: ldr x26
; CHECK-RESERVE-X27-NOT: ldr x27
; CHECK-RESERVE-X28-NOT: ldr x28
; CHECK-RESERVE-X30-NOT: ldr x30
; CHECK-RESERVE: ret
ret void
}