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[gas][arm] Add -mwarn-restrict-it

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Add a -m{no-}warn-restrict-it option to control IT related warnings in
ARMv8-A and ARMv8-R.  This is disabled by default.

Committed on behalf of Wilco Dijkstra.

gas/ChangeLog:
2019-12-11  Wilco Dijkstra  <wdijkstr@arm.com>

	* config/tc-arm.c (warn_on_restrict_it): Add new variable.
	(it_fsm_post_encode): Check warn_on_restrict_it.
	(arm_option_table): Add -mwarn-restrict-it/-mno-warn-restrict-it.
	* testsuite/gas/arm/armv8-2-fp16-scalar-bad.d: Add -mwarn-restrict-it.
	* testsuite/gas/arm/armv8-2-fp16-scalar-bad-ext.d: Likewise.
	* testsuite/gas/arm/armv8-a-bad.d: Likewise.
	* testsuite/gas/arm/armv8-a-it-bad.d: Likewise.
	* testsuite/gas/arm/armv8-r-bad.d: Likewise.
	* testsuite/gas/arm/armv8-r-it-bad.d: Likewise.
	* testsuite/gas/arm/sp-pc-validations-bad-t-v8a.d: Likewise.
	* testsuite/gas/arm/udf.d: Likewise.
This commit is contained in:
Andre Vieira 2019-12-11 15:53:26 +00:00
parent 2e74427698
commit 24f19ccb89
10 changed files with 29 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
gas/ChangeLog
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@ -1,3 +1,17 @@
2019-12-11 Wilco Dijkstra <wdijkstr@arm.com>
* config/tc-arm.c (warn_on_restrict_it): Add new variable.
(it_fsm_post_encode): Check warn_on_restrict_it.
(arm_option_table): Add -mwarn-restrict-it/-mno-warn-restrict-it.
* testsuite/gas/arm/armv8-2-fp16-scalar-bad.d: Add -mwarn-restrict-it.
* testsuite/gas/arm/armv8-2-fp16-scalar-bad-ext.d: Likewise.
* testsuite/gas/arm/armv8-a-bad.d: Likewise.
* testsuite/gas/arm/armv8-a-it-bad.d: Likewise.
* testsuite/gas/arm/armv8-r-bad.d: Likewise.
* testsuite/gas/arm/armv8-r-it-bad.d: Likewise.
* testsuite/gas/arm/sp-pc-validations-bad-t-v8a.d: Likewise.
* testsuite/gas/arm/udf.d: Likewise.
2018-12-11 Jan Beulich <jbeulich@suse.com>
* config/tc-i386.c (md_assemble): Extend SSE check conditional.

7
gas/config/tc-arm.c
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@ -154,6 +154,7 @@ static int pic_code = FALSE;
static int fix_v4bx = FALSE;
/* Warn on using deprecated features. */
static int warn_on_deprecated = TRUE;
static int warn_on_restrict_it = FALSE;
/* Understand CodeComposer Studio assembly syntax. */
bfd_boolean codecomposer_syntax = FALSE;
@ -22788,6 +22789,7 @@ it_fsm_post_encode (void)
handle_pred_state ();
if (now_pred.insn_cond
&& warn_on_restrict_it
&& !now_pred.warn_deprecated
&& warn_on_deprecated
&& ARM_CPU_HAS_FEATURE (cpu_variant, arm_ext_v8)
@ -30529,6 +30531,11 @@ struct arm_option_table arm_opts[] =
{"mwarn-deprecated", NULL, &warn_on_deprecated, 1, NULL},
{"mno-warn-deprecated", N_("do not warn on use of deprecated feature"),
&warn_on_deprecated, 0, NULL},
{"mwarn-restrict-it", N_("warn about performance deprecated IT instructions"
" in ARMv8-A and ARMv8-R"), &warn_on_restrict_it, 1, NULL},
{"mno-warn-restrict-it", NULL, &warn_on_restrict_it, 0, NULL},
{"mwarn-syms", N_("warn about symbols that match instruction names [default]"), (int *) (& flag_warn_syms), TRUE, NULL},
{"mno-warn-syms", N_("disable warnings about symobls that match instructions"), (int *) (& flag_warn_syms), FALSE, NULL},
{NULL, NULL, NULL, 0, NULL}

2
gas/testsuite/gas/arm/armv8-2-fp16-scalar-bad-ext.d
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@ -1,4 +1,4 @@
#name: Invalid armv8.2-a scalar fp16
#source: armv8-2-fp16-scalar-bad.s
#as: -march=armv8.2-a+fp16
#as: -march=armv8.2-a+fp16 -mwarn-restrict-it
#error_output: armv8-2-fp16-scalar-bad.l

2
gas/testsuite/gas/arm/armv8-2-fp16-scalar-bad.d
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@ -1,4 +1,4 @@
#name: Invalid armv8.2-a scalar fp16
#source: armv8-2-fp16-scalar-bad.s
#as: -march=armv8.2-a+fp16 -mfpu=fp-armv8
#as: -march=armv8.2-a+fp16 -mfpu=fp-armv8 -mwarn-restrict-it
#error_output: armv8-2-fp16-scalar-bad.l

2
gas/testsuite/gas/arm/armv8-a-bad.d
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@ -1,4 +1,4 @@
#name: Invalid v8-a
#source: armv8-ar-bad.s
#as: -march=armv8-a
#as: -march=armv8-a -mwarn-restrict-it
#error_output: armv8-ar-bad.l

2
gas/testsuite/gas/arm/armv8-a-it-bad.d
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@ -1,4 +1,4 @@
#name: Deprecated IT blocks (ARM v8)
#source: armv8-ar-it-bad.s
#error_output: armv8-ar-it-bad.l
#as: -march=armv8-a -mimplicit-it=always
#as: -march=armv8-a -mimplicit-it=always -mwarn-restrict-it

2
gas/testsuite/gas/arm/armv8-r-bad.d
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@ -1,4 +1,4 @@
#name: Invalid v8-r
#source: armv8-ar-bad.s
#as: -march=armv8-r
#as: -march=armv8-r -mwarn-restrict-it
#error_output: armv8-ar-bad.l

2
gas/testsuite/gas/arm/armv8-r-it-bad.d
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@ -1,4 +1,4 @@
#name: Deprecated IT blocks (ARM v8)
#source: armv8-ar-it-bad.s
#error_output: armv8-ar-it-bad.l
#as: -march=armv8-r -mimplicit-it=always
#as: -march=armv8-r -mimplicit-it=always -mwarn-restrict-it

2
gas/testsuite/gas/arm/sp-pc-validations-bad-t-v8a.d
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@ -1,4 +1,4 @@
# as: -march=armv8-a
# as: -march=armv8-a -mwarn-restrict-it
# name: Invalid SP and PC operands test - THUMB (v8a)
# source: sp-pc-validations-bad-t.s
# error_output: sp-pc-validations-bad-t-v8a.l

2
gas/testsuite/gas/arm/udf.d
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@ -1,6 +1,6 @@
#objdump: -dr --prefix-addresses --show-raw-insn
#name: UDF
#as: -march=armv8-a
#as: -march=armv8-a -mwarn-restrict-it
#warning_output: udf.l
#skip: *-*-pe *-*-wince