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| author | Andre Simoes Dias Vieira <andre.simoesdiasvieira@arm.com> | 2018-02-21 15:11:50 +0000 |
|---|---|---|
| committer | Thomas Preud'homme <thomas.preudhomme@arm.com> | 2018-02-22 16:34:36 +0000 |
| commit | 7bdf778b10b1ab85553a31c104097073214f6430 (patch) | |
| tree | 60adec937aa2b6f43dd9f7116d23380c0698996b /gas/config | |
| parent | 6b6b680700699c15e22b6c36975729035676eef1 (diff) | |
| download | gdb-7bdf778b10b1ab85553a31c104097073214f6430.zip gdb-7bdf778b10b1ab85553a31c104097073214f6430.tar.gz gdb-7bdf778b10b1ab85553a31c104097073214f6430.tar.bz2 | |
Diagnose when trying to assemble conditional FP16 vmovx and vins
This patch makes GAS emit a warning when trying to assemble the Armv8.2
FP16 instructions VMOVX and VINS with condition codes. The Armv8-A
Reference Manual specifies these instructions without conditional codes
and says that if they are found in an IT block that they are CONSTRAINED
UNPREDICABLE.
gas/ChangeLog:
2018-02-22 Andre Vieira <andre.simoesdiasvieira@arm.com>
* config/tc-arm.c (do_neon_movhf): If conditional error out when in arm
mode and emit warning in thumb mode.
* testsuite/gas/arm/armv8-2-fp16-scalar-bad.s: Add new tests.
* testsuite/gas/arm/armv8-2-fp16-scalar-bad.l: Idem.
Diffstat (limited to 'gas/config')
| -rw-r--r-- | gas/config/tc-arm.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c index cac4ed9..d6a923d 100644 --- a/gas/config/tc-arm.c +++ b/gas/config/tc-arm.c @@ -16772,6 +16772,20 @@ do_neon_movhf (void) constraint (!ARM_CPU_HAS_FEATURE (cpu_variant, fpu_vfp_ext_armv8), _(BAD_FPU)); + if (inst.cond != COND_ALWAYS) + { + if (thumb_mode) + { + as_warn (_("ARMv8.2 scalar fp16 instruction cannot be conditional," + " the behaviour is UNPREDICTABLE")); + } + else + { + inst.error = BAD_COND; + return; + } + } + do_vfp_sp_monadic (); inst.is_neon = 1; |