testsuite/arm: Fix -mfloat-abi order in arm_v8_1m_mve_ok_nocache and arm_v8_1m_mve_fp_ok_nocache

Make the order in which we try -mfloat-abi options consistent with the
other similar effective targets: try softfp first, then hard.

This shows that a few tests implicitly rely on -mfloat-abi=hard, so we
add this option via dg-additional-options so that it comes after any
potential -mfloat-abi option that the preceding effective-targets
might have added.

armv8_1m-fpXX-move-1.c tests don't need arm_hard_ok because they don't
include arm_mve.h: adding -mfloat-abi=hard when using a soft/softfp
toolchain does not lead to the missing include gnu/stubs-*.h error.

This patch makes armv8_1m-fpXX-move-1.c pass on arm-linux-gnueabi, and
the other tests become unsupported (instead of fail) on this target.

On arm-eabi with default cpu/fpu/mode and a+rm multilibs, the same
mve/intrinsics/* tests become unsupported instead of pass because
arm_hard_ok fails with "selected processor lacks an FPU". Since we
also override the fpu via dg-options, we'd need another effective
target (say arm_hard_mve_ok) that would check -mfloat-abi=hard
-mfpu=auto -march=armv8.1-m.main+mve.fp at the same time. But we have
already so many arm effective targets, it doesn't seem like a good way
forward.

2021-03-19  Christophe Lyon  <christophe.lyon@linaro.org>

	gcc/testsuite/
	* lib/target-supports.exp
	(check_effective_target_arm_v8_1m_mve_fp_ok_nocache): Fix
	-mfloat-abi= options order.
	(check_effective_target_arm_v8_1m_mve_ok_nocache): Likewise
	* gcc.target/arm/mve/intrinsics/mve_vector_float2.c: Add
	arm_hard_ok effective target and -mfloat-abi=hard additional
	option.
	* gcc.target/arm/mve/intrinsics/mve_vector_int.c: Likewise.
	* gcc.target/arm/mve/intrinsics/mve_vector_uint.c: Likewise.
	* gcc.target/arm/mve/intrinsics/mve_vector_uint1.c: Likewise.
	* gcc.target/arm/mve/intrinsics/mve_vector_uint2.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vgetq_lane_s64.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vgetq_lane_u64.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsetq_lane_s64.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vsetq_lane_u64.c: Likewise.
	* gcc.target/arm/armv8_1m-fp16-move-1.c: Add -mfloat-abi=hard
	additional option.
	* gcc.target/arm/armv8_1m-fp32-move-1.c: Likewise.
	* gcc.target/arm/armv8_1m-fp64-move-1.c: Likewise.

gcc/testsuite/gcc.target/arm/armv8_1m-fp16-move-1.c

@@ -1,7 +1,8 @@
 /* { dg-do compile } */
-/* { dg-options "-O -mfloat-abi=hard -mfp16-format=ieee" } */
+/* { dg-options "-O -mfp16-format=ieee" } */
 /* { dg-require-effective-target arm_v8_1m_mve_ok } */
 /* { dg-add-options arm_v8_1m_mve } */
+/* { dg-additional-options "-mfloat-abi=hard" } *
 /* { dg-final { check-function-bodies "**" "" } } */
 
 /*

gcc/testsuite/gcc.target/arm/armv8_1m-fp32-move-1.c

@@ -1,7 +1,8 @@
 /* { dg-do compile } */
-/* { dg-options "-O -mfloat-abi=hard" } */
+/* { dg-options "-O" } */
 /* { dg-require-effective-target arm_v8_1m_mve_ok } */
 /* { dg-add-options arm_v8_1m_mve } */
+/* { dg-additional-options "-mfloat-abi=hard" } *
 /* { dg-final { check-function-bodies "**" "" } } */
 
 /*

gcc/testsuite/gcc.target/arm/armv8_1m-fp64-move-1.c

@@ -1,7 +1,8 @@
 /* { dg-do compile } */
-/* { dg-options "-O -mfloat-abi=hard" } */
+/* { dg-options "-O" } */
 /* { dg-require-effective-target arm_v8_1m_mve_ok } */
 /* { dg-add-options arm_v8_1m_mve } */
+/* { dg-additional-options "-mfloat-abi=hard" } *
 /* { dg-final { check-function-bodies "**" "" } } */
 
 /*

gcc/testsuite/gcc.target/arm/mve/intrinsics/mve_vector_float2.c

@@ -1,5 +1,7 @@
+/* { dg-require-effective-target arm_hard_ok } */
 /* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
 /* { dg-add-options arm_v8_1m_mve_fp } */
+/* { dg-additional-options "-mfloat-abi=hard" } */
 /* { dg-skip-if "Incompatible float ABI" { *-*-* } { "-mfloat-abi=soft" } {""} } */
 
 #include "arm_mve.h"

gcc/testsuite/gcc.target/arm/mve/intrinsics/mve_vector_int.c

@@ -1,5 +1,7 @@
+/* { dg-require-effective-target arm_hard_ok } */
 /* { dg-require-effective-target arm_v8_1m_mve_ok } */
 /* { dg-add-options arm_v8_1m_mve } */
+/* { dg-additional-options "-mfloat-abi=hard" } */
 /* { dg-skip-if "Incompatible float ABI" { *-*-* } { "-mfloat-abi=soft" } {""} } */
 
 #include "arm_mve.h"

gcc/testsuite/gcc.target/arm/mve/intrinsics/mve_vector_uint.c

@@ -1,5 +1,7 @@
+/* { dg-require-effective-target arm_hard_ok } */
 /* { dg-require-effective-target arm_v8_1m_mve_ok } */
 /* { dg-add-options arm_v8_1m_mve } */
+/* { dg-additional-options "-mfloat-abi=hard" } */
 /* { dg-skip-if "Incompatible float ABI" { *-*-* } { "-mfloat-abi=soft" } {""} } */
 
 #include "arm_mve.h"

gcc/testsuite/gcc.target/arm/mve/intrinsics/mve_vector_uint1.c

@@ -1,5 +1,7 @@
+/* { dg-require-effective-target arm_hard_ok } */
 /* { dg-require-effective-target arm_v8_1m_mve_ok } */
 /* { dg-add-options arm_v8_1m_mve } */
+/* { dg-additional-options "-mfloat-abi=hard" } */
 /* { dg-skip-if "Incompatible float ABI" { *-*-* } { "-mfloat-abi=soft" } {""} } */
 
 #include "arm_mve.h"

gcc/testsuite/gcc.target/arm/mve/intrinsics/mve_vector_uint2.c

@@ -1,5 +1,7 @@
+/* { dg-require-effective-target arm_hard_ok } */
 /* { dg-require-effective-target arm_v8_1m_mve_ok } */
 /* { dg-add-options arm_v8_1m_mve } */
+/* { dg-additional-options "-mfloat-abi=hard" } */
 /* { dg-skip-if "Incompatible float ABI" { *-*-* } { "-mfloat-abi=soft" } {""} } */
 
 #include "arm_mve.h"

gcc/testsuite/gcc.target/arm/mve/intrinsics/vgetq_lane_s64.c

@@ -1,7 +1,8 @@
 /* { dg-skip-if "Incompatible float ABI" { *-*-* } { "-mfloat-abi=soft" } {""} } */
+/* { dg-require-effective-target arm_hard_ok } */
 /* { dg-require-effective-target arm_v8_1m_mve_ok } */
 /* { dg-add-options arm_v8_1m_mve } */
-/* { dg-additional-options "-O2" } */
+/* { dg-additional-options "-mfloat-abi=hard -O2" } */
 
 #include "arm_mve.h"
 

gcc/testsuite/gcc.target/arm/mve/intrinsics/vgetq_lane_u64.c

@@ -1,7 +1,8 @@
 /* { dg-skip-if "Incompatible float ABI" { *-*-* } { "-mfloat-abi=soft" } {""} } */
+/* { dg-require-effective-target arm_hard_ok } */
 /* { dg-require-effective-target arm_v8_1m_mve_ok } */
 /* { dg-add-options arm_v8_1m_mve } */
-/* { dg-additional-options "-O2" } */
+/* { dg-additional-options "-mfloat-abi=hard -O2" } */
 
 #include "arm_mve.h"
 

gcc/testsuite/gcc.target/arm/mve/intrinsics/vsetq_lane_s64.c

@@ -1,7 +1,8 @@
 /* { dg-skip-if "Incompatible float ABI" { *-*-* } { "-mfloat-abi=soft" } {""} } */
+/* { dg-require-effective-target arm_hard_ok } */
 /* { dg-require-effective-target arm_v8_1m_mve_ok } */
 /* { dg-add-options arm_v8_1m_mve } */
-/* { dg-additional-options "-O2" } */
+/* { dg-additional-options "-mfloat-abi=hard -O2" } */
 
 #include "arm_mve.h"
 

gcc/testsuite/gcc.target/arm/mve/intrinsics/vsetq_lane_u64.c

@@ -1,7 +1,8 @@
 /* { dg-skip-if "Incompatible float ABI" { *-*-* } { "-mfloat-abi=soft" } {""} } */
+/* { dg-require-effective-target arm_hard_ok } */
 /* { dg-require-effective-target arm_v8_1m_mve_ok } */
 /* { dg-add-options arm_v8_1m_mve } */
-/* { dg-additional-options "-O2" } */
+/* { dg-additional-options "-mfloat-abi=hard -O2" } */
 
 #include "arm_mve.h"
 

gcc/testsuite/lib/target-supports.exp

@@ -5025,7 +5025,7 @@ proc check_effective_target_arm_v8_1m_mve_fp_ok_nocache { } {
 
     # Iterate through sets of options to find the compiler flags that
     # need to be added to the -march option.
-    foreach flags {"" "-mfloat-abi=hard -mfpu=auto -march=armv8.1-m.main+mve.fp" "-mfloat-abi=softfp -mfpu=auto -march=armv8.1-m.main+mve.fp"} {
+    foreach flags {"" "-mfloat-abi=softfp -mfpu=auto -march=armv8.1-m.main+mve.fp" "-mfloat-abi=hard -mfpu=auto -march=armv8.1-m.main+mve.fp"} {
 	if { [check_no_compiler_messages_nocache \
 		  arm_v8_1m_mve_fp_ok object {
 	    #include <arm_mve.h>
@@ -5208,7 +5208,7 @@ proc check_effective_target_arm_v8_1m_mve_ok_nocache { } {
 
     # Iterate through sets of options to find the compiler flags that
     # need to be added to the -march option.
-    foreach flags {"" "-mfloat-abi=hard -mfpu=auto -march=armv8.1-m.main+mve" "-mfloat-abi=softfp -mfpu=auto -march=armv8.1-m.main+mve"} {
+    foreach flags {"" "-mfloat-abi=softfp -mfpu=auto -march=armv8.1-m.main+mve" "-mfloat-abi=hard -mfpu=auto -march=armv8.1-m.main+mve"} {
         if { [check_no_compiler_messages_nocache \
                   arm_v8_1m_mve_ok object {
             #if !defined (__ARM_FEATURE_MVE)