aarch64: Fix target/optimize option handling with transiting between O1 to O2

The problem here is the aarch64 backend enables -mearly-ra at -O2 and above but
it is not marked as an Optimization in the .opt file so enabling it sometimes
reset the target options when going from -O1 to -O2 for the first time.

Build and tested for aarch64-linux-gnu with no regressions.

	PR target/116065

gcc/ChangeLog:

	* config/aarch64/aarch64.opt (mearly-ra=): Mark as Optimization rather
	than Save.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/sve/target_optimization-1.c: New test.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>

diff --git a/gcc/config/aarch64/aarch64.opt b/gcc/config/aarch64/aarch64.opt
index 2f90f10352af75f70112d07894ab200f48b143f4..6229bcb371e37e988f811bc38301423a742e030c 100644 (file)
--- a/gcc/config/aarch64/aarch64.opt
+++ b/gcc/config/aarch64/aarch64.opt
@@ -256,7 +256,7 @@ EnumValue
 Enum(early_ra_scope) String(none) Value(AARCH64_EARLY_RA_NONE)
 
 mearly-ra=
-Target RejectNegative Joined Enum(early_ra_scope) Var(aarch64_early_ra) Init(AARCH64_EARLY_RA_NONE) Save
+Target RejectNegative Joined Enum(early_ra_scope) Var(aarch64_early_ra) Init(AARCH64_EARLY_RA_NONE) Optimization
 Specify when to enable an early register allocation pass.  The possibilities
 are: all functions, functions that have access to strided multi-register
 instructions, and no functions.

diff --git a/gcc/testsuite/gcc.target/aarch64/sve/target_optimization-1.c b/gcc/testsuite/gcc.target/aarch64/sve/target_optimization-1.c
new file mode 100644 (file)
index 0000000..3010f0c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/sve/target_optimization-1.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O1" } */
+
+#include <arm_sve.h>
+
+/* Turn off SVE overall */
+#pragma GCC target("+nosve")
+
+/* But the function turns it on again so it should work.
+   Even if changing the optimization level from O1 to O2. */
+int __attribute__((target ("+sve"), optimize(2)))
+bar (void)
+{
+  svfloat32_t xseg;
+  return svlen_f32(xseg);
+}