Re: [patch, testsuite, arm] Fix ICE in gcc.dg/gimplefe-28.c

[Sandra Loosemore <sandra@codesourcery.com>]

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On 9/20/19 2:18 AM, Kyrill Tkachov wrote:
> 
> Yeah, an add_options_for_arm_vfp is what we ideally need here.

How about this version of the patch?  The two test cases I also tweaked 
to use it are the only ones that use the corresponding arm_vfp_ok 
effective target.

-Sandra

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2019-09-22  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/testsuite/
	* lib/target-supports.exp
	(check_effective_target_arm_vfp_ok_nocache): New.
	(check_effective_target_arm_vfp_ok): Rewrite.
	(add_options_for_arm_vfp): New.
	(add_options_for_sqrt_insn): Add options for arm.
	* gcc.target/arm/attr-neon-builtin-fail2.c: Use dg-add-options.
	* gcc.target/arm/short-vfp-1.c: Likewise.

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Index: gcc/testsuite/gcc.target/arm/attr-neon-builtin-fail2.c
===================================================================
--- gcc/testsuite/gcc.target/arm/attr-neon-builtin-fail2.c	(revision 276004)
+++ gcc/testsuite/gcc.target/arm/attr-neon-builtin-fail2.c	(working copy)
@@ -1,7 +1,8 @@
 /* Check that calling a neon builtin from a function compiled with vfp fails.  */
 /* { dg-do compile } */
 /* { dg-require-effective-target arm_vfp_ok } */
-/* { dg-options "-O2 -mfloat-abi=softfp" } */
+/* { dg-options "-O2" } */
+/* { dg-add-options arm_vfp } */
 
 extern __simd64_int8_t a, b;
 
Index: gcc/testsuite/gcc.target/arm/short-vfp-1.c
===================================================================
--- gcc/testsuite/gcc.target/arm/short-vfp-1.c	(revision 276004)
+++ gcc/testsuite/gcc.target/arm/short-vfp-1.c	(working copy)
@@ -1,6 +1,6 @@
 /* { dg-do compile } */
 /* { dg-require-effective-target arm_vfp_ok }
-/* { dg-options "-mfpu=vfp" } */
+/* { dg-add-options arm_vfp } */
 
 int
 test_sisf (float x)
Index: gcc/testsuite/lib/target-supports.exp
===================================================================
--- gcc/testsuite/lib/target-supports.exp	(revision 276004)
+++ gcc/testsuite/lib/target-supports.exp	(working copy)
@@ -3489,18 +3489,43 @@ proc check_effective_target_arm_soft_ok
     }
 }
 
-# Return 1 if this is an ARM target supporting -mfpu=vfp
-# -mfloat-abi=softfp.  Some multilibs may be incompatible with these
-# options.
+# Return 1 if this is an ARM target supporting -mfpu=vfp with an
+# appropriate abi.
 
-proc check_effective_target_arm_vfp_ok { } {
+proc check_effective_target_arm_vfp_ok_nocache { } {
+    global et_arm_vfp_flags
+    set et_arm_vfp_flags ""
     if { [check_effective_target_arm32] } {
-	return [check_no_compiler_messages arm_vfp_ok object {
-	    int dummy;
-	} "-mfpu=vfp -mfloat-abi=softfp"]
-    } else {
-	return 0
+	foreach flags {"-mfpu=vfp" "-mfpu=vfp -mfloat-abi=softfp" "-mpu=vfp -mfloat-abi=hard"} {
+	    if { [check_no_compiler_messages_nocache arm_fp_ok object {
+		#ifndef __ARM_FP
+		#error __ARM_FP not defined
+		#endif
+	    } "$flags"] } {
+		set et_arm_vfp_flags $flags
+		return 1
+	    }
+	}
     }
+
+    return 0
+}
+
+proc check_effective_target_arm_vfp_ok { } {
+    return [check_cached_effective_target arm_vfp_ok \
+		check_effective_target_arm_vfp_ok_nocache]
+}
+
+# Add the options needed to compile code with -mfpu=vfp.  We need either
+# -mfloat-abi=softfp or -mfloat-abi=hard, but if one is already
+# specified by the multilib, use it.
+
+proc add_options_for_arm_vfp { flags } {
+    if { ! [check_effective_target_arm_vfp_ok] } {
+	return "$flags"
+    }
+    global et_arm_vfp_flags
+    return "$flags $et_arm_vfp_flags"
 }
 
 # Return 1 if this is an ARM target supporting -mfpu=vfp3
@@ -6678,6 +6703,9 @@ proc add_options_for_sqrt_insn { flags }
     if { [istarget amdgcn*-*-*] } {
 	return "$flags -ffast-math"
     }
+    if { [istarget arm*-*-*] } {
+	return [add_options_for_arm_vfp "$flags"]
+    }
     return $flags
 }