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[AArch64] Add support for -ffixed-x30 

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 1b9fdec1f6
commit e770153865
4 changed files with 14 additions and 2 deletions
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3
clang/lib/Driver/ToolChains/Arch/AArch64.cpp
View File

@ -409,6 +409,9 @@ fp16_fml_fallthrough:
if (Args.hasArg(options::OPT_ffixed_x28))
Features.push_back("+reserve-x28");
if (Args.hasArg(options::OPT_ffixed_x30))
Features.push_back("+reserve-x30");
if (Args.hasArg(options::OPT_fcall_saved_x8))
Features.push_back("+call-saved-x8");

4
clang/test/Driver/aarch64-fixed-x-register.c
View File

@ -94,6 +94,10 @@
// RUN: FileCheck --check-prefix=CHECK-FIXED-X28 < %t %s
// CHECK-FIXED-X28: "-target-feature" "+reserve-x28"
// RUN: %clang -target aarch64-none-gnu -ffixed-x30 -### %s 2> %t
// RUN: FileCheck --check-prefix=CHECK-FIXED-X30 < %t %s
// CHECK-FIXED-X30: "-target-feature" "+reserve-x30"
// Test multiple of reserve-x# options together.
// RUN: %clang -target aarch64-none-gnu \
// RUN: -ffixed-x1 \

2
llvm/lib/Target/AArch64/AArch64.td
View File

@ -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
llvm/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
}