[FPEnv] Enable strict fp for AArch64 in clang

The AArch64 target now has the necessary support for strict fp, so
enable it in clang.

Differential Revision: https://reviews.llvm.org/D138143

clang/docs/ReleaseNotes.rst

@@ -765,6 +765,9 @@ Arm and AArch64 Support in Clang
   * Arm Cortex-A715 (cortex-a715).
   * Arm Cortex-X3 (cortex-x3).
   * Arm Neoverse V2 (neoverse-v2)
+- Strict floating point has been enabled for AArch64, which means that
+  ``-ftrapping-math``, ``-frounding-math``, ``-ffp-model=strict``, and
+  ``-ffp-exception-behaviour=<arg>`` are now accepted.
 
 Floating Point Support in Clang
 -------------------------------

clang/lib/Basic/Targets/AArch64.cpp

@@ -84,6 +84,7 @@ AArch64TargetInfo::AArch64TargetInfo(const llvm::Triple &Triple,
   HasLegalHalfType = true;
   HalfArgsAndReturns = true;
   HasFloat16 = true;
+  HasStrictFP = true;
 
   if (Triple.isArch64Bit())
     LongWidth = LongAlign = PointerWidth = PointerAlign = 64;

clang/test/CodeGen/aarch64-neon-intrinsics-constrained.c

@@ -4,7 +4,7 @@
 // RUN: | FileCheck --check-prefixes=COMMON,COMMONIR,UNCONSTRAINED %s
 // RUN: %clang_cc1 -triple arm64-none-linux-gnu -target-feature +neon \
 // RUN:     -S -disable-O0-optnone \
-// RUN:  -ffp-exception-behavior=strict -fexperimental-strict-floating-point \
+// RUN:  -ffp-exception-behavior=strict \
 // RUN:  -flax-vector-conversions=none -emit-llvm -o - %s | opt -S -passes=mem2reg \
 // RUN: | FileCheck --check-prefixes=COMMON,COMMONIR,CONSTRAINED %s
 

clang/test/CodeGen/aarch64-neon-misc-constrained.c

@@ -3,7 +3,6 @@
 // RUN: | opt -S -passes=mem2reg | FileCheck --check-prefix=COMMON --check-prefix=COMMONIR --check-prefix=UNCONSTRAINED %s
 // RUN: %clang_cc1 -triple arm64-none-linux-gnu -target-feature +neon \
 // RUN:  -ffp-exception-behavior=strict \
-// RUN:  -fexperimental-strict-floating-point \
 // RUN:  -disable-O0-optnone -emit-llvm -o - %s \
 // RUN: | opt -S -passes=mem2reg | FileCheck --check-prefix=COMMON --check-prefix=COMMONIR --check-prefix=CONSTRAINED %s
 // RUN: %clang_cc1 -triple arm64-none-linux-gnu -target-feature +neon \
@@ -11,7 +10,6 @@
 // RUN: | FileCheck --check-prefix=COMMON --check-prefix=CHECK-ASM %s
 // RUN: %clang_cc1 -triple arm64-none-linux-gnu -target-feature +neon \
 // RUN:  -ffp-exception-behavior=strict \
-// RUN:  -fexperimental-strict-floating-point \
 // RUN:  -disable-O0-optnone -S -o - %s \
 // RUN: | FileCheck --check-prefix=COMMON --check-prefix=CHECK-ASM %s
 

clang/test/CodeGen/aarch64-neon-scalar-x-indexed-elem-constrained.c

@@ -3,7 +3,6 @@
 // RUN: | FileCheck --check-prefix=COMMON --check-prefix=COMMONIR --check-prefix=UNCONSTRAINED %s
 // RUN: %clang_cc1 -triple arm64-none-linux-gnu -target-feature +neon -target-cpu cyclone \
 // RUN: -ffp-exception-behavior=strict \
-// RUN: -fexperimental-strict-floating-point \
 // RUN: -disable-O0-optnone -emit-llvm -o - %s | opt -S -passes=mem2reg \
 // RUN: | FileCheck --check-prefix=COMMON --check-prefix=COMMONIR --check-prefix=CONSTRAINED %s
 // RUN: %clang_cc1 -triple arm64-none-linux-gnu -target-feature +neon -target-cpu cyclone \
@@ -11,7 +10,6 @@
 // RUN: | FileCheck --check-prefix=COMMON --check-prefix=CHECK-ASM %s
 // RUN: %clang_cc1 -triple arm64-none-linux-gnu -target-feature +neon -target-cpu cyclone \
 // RUN: -ffp-exception-behavior=strict \
-// RUN: -fexperimental-strict-floating-point \
 // RUN: -disable-O0-optnone -emit-llvm -o - %s | opt -S -passes=mem2reg | llc -o=- - \
 // RUN: | FileCheck --check-prefix=COMMON --check-prefix=CHECK-ASM %s
 

clang/test/CodeGen/aarch64-strictfp-builtins.c

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 %s -emit-llvm -ffp-exception-behavior=maytrap -fexperimental-strict-floating-point -o - -triple arm64-none-linux-gnu | FileCheck %s
+// RUN: %clang_cc1 %s -emit-llvm -ffp-exception-behavior=maytrap -o - -triple arm64-none-linux-gnu | FileCheck %s
 
 // Test that the constrained intrinsics are picking up the exception
 // metadata from the AST instead of the global default from the command line.

clang/test/CodeGen/aarch64-v8.2a-fp16-intrinsics-constrained.c

@@ -4,7 +4,7 @@
 // RUN: | FileCheck --check-prefixes=COMMON,COMMONIR,UNCONSTRAINED %s
 // RUN: %clang_cc1 -triple arm64-none-linux-gnu -target-feature +fullfp16 \
 // RUN: -S -disable-O0-optnone \
-// RUN: -ffp-exception-behavior=strict -fexperimental-strict-floating-point -emit-llvm -o - %s | opt -S -passes=mem2reg \
+// RUN: -ffp-exception-behavior=strict -emit-llvm -o - %s | opt -S -passes=mem2reg \
 // RUN: | FileCheck --check-prefixes=COMMON,COMMONIR,CONSTRAINED %s
 
 // REQUIRES: aarch64-registered-target

clang/test/CodeGen/aarch64-v8.2a-neon-intrinsics-constrained.c

@@ -4,7 +4,6 @@
 // RUN: | FileCheck --check-prefix=COMMON --check-prefix=COMMONIR --check-prefix=UNCONSTRAINED %s
 // RUN: %clang_cc1 -triple arm64-none-linux-gnu -target-feature +neon -target-feature +fullfp16 -target-feature +v8.2a\
 // RUN: -ffp-exception-behavior=maytrap -DEXCEPT=1 \
-// RUN: -fexperimental-strict-floating-point \
 // RUN: -flax-vector-conversions=none -S -disable-O0-optnone -emit-llvm -o - %s \
 // RUN: | opt -S -passes=mem2reg \
 // RUN: | FileCheck --check-prefix=COMMON --check-prefix=COMMONIR --check-prefix=CONSTRAINED %s
@@ -14,7 +13,6 @@
 // RUN: | FileCheck --check-prefix=COMMON --check-prefix=CHECK-ASM %s
 // RUN: %clang_cc1 -triple arm64-none-linux-gnu -target-feature +neon -target-feature +fullfp16 -target-feature +v8.2a\
 // RUN: -ffp-exception-behavior=maytrap -DEXCEPT=1 \
-// RUN: -fexperimental-strict-floating-point \
 // RUN: -flax-vector-conversions=none -S -disable-O0-optnone -emit-llvm -o - %s \
 // RUN: | opt -S -passes=mem2reg | llc -o=- - \
 // RUN: | FileCheck --check-prefix=COMMON --check-prefix=CHECK-ASM %s

clang/test/CodeGen/arm-neon-directed-rounding-constrained.c

@@ -12,7 +12,6 @@
 // RUN:     opt -S -passes=mem2reg | FileCheck -check-prefixes=COMMON,COMMONIR,CONSTRAINED %s
 // RUN: %clang_cc1 -triple arm64-linux-gnueabihf -target-feature +neon \
 // RUN:     -ffp-exception-behavior=strict \
-// RUN:     -fexperimental-strict-floating-point \
 // RUN:     -ffreestanding -disable-O0-optnone -emit-llvm %s -o - | \
 // RUN:     opt -S -passes=mem2reg | FileCheck -check-prefixes=COMMON,COMMONIR,CONSTRAINED %s
 
@@ -30,7 +29,6 @@
 // RUN:     opt -S -passes=mem2reg | llc -o=- - | FileCheck -check-prefixes=COMMON,CHECK-ASM32 %s
 // RUN: %clang_cc1 -triple arm64-linux-gnueabihf -target-feature +neon \
 // RUN:     -ffp-exception-behavior=strict \
-// RUN:     -fexperimental-strict-floating-point \
 // RUN:     -ffreestanding -disable-O0-optnone -emit-llvm %s -o - | \
 // RUN:     opt -S -passes=mem2reg | llc -o=- - | FileCheck -check-prefixes=COMMON,CHECK-ASM64 %s
 

clang/test/CodeGen/arm64-vrnd-constrained.c

@@ -1,10 +1,10 @@
 // RUN: %clang_cc1 -triple arm64-apple-ios7 -target-feature +neon -ffreestanding -flax-vector-conversions=none -emit-llvm -o - %s \
 // RUN: | FileCheck --check-prefix=COMMON --check-prefix=UNCONSTRAINED %s
-// RUN: %clang_cc1 -triple arm64-apple-ios7 -target-feature +neon -ffreestanding -flax-vector-conversions=none -fexperimental-strict-floating-point -ffp-exception-behavior=strict -emit-llvm -o - %s \
+// RUN: %clang_cc1 -triple arm64-apple-ios7 -target-feature +neon -ffreestanding -flax-vector-conversions=none -ffp-exception-behavior=strict -emit-llvm -o - %s \
 // RUN: | FileCheck --check-prefix=COMMON --check-prefix=CONSTRAINED %s
 // RUN: %clang_cc1 -triple arm64-apple-ios7 -target-feature +neon -ffreestanding -flax-vector-conversions=none -emit-llvm -o - %s | llc -o=- - \
 // RUN: | FileCheck --check-prefix=COMMON --check-prefix=CHECK-ASM %s
-// RUN: %clang_cc1 -triple arm64-apple-ios7 -target-feature +neon -ffreestanding -flax-vector-conversions=none -fexperimental-strict-floating-point -ffp-exception-behavior=strict -emit-llvm -o - %s | llc -o=- - \
+// RUN: %clang_cc1 -triple arm64-apple-ios7 -target-feature +neon -ffreestanding -flax-vector-conversions=none -ffp-exception-behavior=strict -emit-llvm -o - %s | llc -o=- - \
 // RUN: | FileCheck --check-prefix=COMMON --check-prefix=CHECK-ASM %s
 
 // REQUIRES: aarch64-registered-target

clang/test/CodeGen/fp16-ops-strictfp.c

@@ -1,10 +1,10 @@
 // REQUIRES: arm-registered-target
 // RUN: %clang_cc1 -ffp-exception-behavior=maytrap -fexperimental-strict-floating-point -emit-llvm -o - -triple arm-none-linux-gnueabi %s | FileCheck %s --check-prefix=NOTNATIVE --check-prefix=CHECK -vv -dump-input=fail
-// RUN: %clang_cc1 -ffp-exception-behavior=maytrap -fexperimental-strict-floating-point -emit-llvm -o - -triple aarch64-none-linux-gnueabi %s | FileCheck %s --check-prefix=NOTNATIVE --check-prefix=CHECK
+// RUN: %clang_cc1 -ffp-exception-behavior=maytrap -emit-llvm -o - -triple aarch64-none-linux-gnueabi %s | FileCheck %s --check-prefix=NOTNATIVE --check-prefix=CHECK
 // RUN: %clang_cc1 -ffp-exception-behavior=maytrap -fexperimental-strict-floating-point -emit-llvm -o - -triple x86_64-linux-gnu %s | FileCheck %s --check-prefix=NOTNATIVE --check-prefix=CHECK
 // RUN: %clang_cc1 -ffp-exception-behavior=maytrap -fexperimental-strict-floating-point -emit-llvm -o - -triple arm-none-linux-gnueabi -fnative-half-type %s \
 // RUN:   | FileCheck %s --check-prefix=NATIVE-HALF --check-prefix=CHECK
-// RUN: %clang_cc1 -ffp-exception-behavior=maytrap -fexperimental-strict-floating-point -emit-llvm -o - -triple aarch64-none-linux-gnueabi -fnative-half-type %s \
+// RUN: %clang_cc1 -ffp-exception-behavior=maytrap -emit-llvm -o - -triple aarch64-none-linux-gnueabi -fnative-half-type %s \
 // RUN:   | FileCheck %s --check-prefix=NATIVE-HALF --check-prefix=CHECK
 //
 // Test that the constrained intrinsics are picking up the exception

clang/test/Parser/pragma-fp-warn.c

@@ -1,7 +1,7 @@
 
 // RUN: %clang_cc1 -triple wasm32 -fsyntax-only -Wno-unknown-pragmas -Wignored-pragmas -verify %s
 // RUN: %clang_cc1 -triple thumbv7 -fsyntax-only -Wno-unknown-pragmas -Wignored-pragmas -verify %s
-// RUN: %clang_cc1 -triple aarch64 -fsyntax-only -Wno-unknown-pragmas -Wignored-pragmas -verify %s
+// RUN: %clang_cc1 -DEXPOK -triple aarch64 -fsyntax-only -Wno-unknown-pragmas -Wignored-pragmas -verify %s
 // RUN: %clang_cc1 -DEXPOK -triple x86_64 -fsyntax-only -Wno-unknown-pragmas -Wignored-pragmas -verify %s
 // RUN: %clang_cc1 -DEXPOK -triple systemz -fsyntax-only -Wno-unknown-pragmas -Wignored-pragmas -verify %s
 // RUN: %clang_cc1 -DEXPOK -triple powerpc -fsyntax-only -Wno-unknown-pragmas -Wignored-pragmas -verify %s