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| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/config/aarch64/aarch64.c | 18 |
2 files changed, 19 insertions, 4 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index dadbf4e27bd..505b5b0e0f3 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,10 @@ 2016-06-20 Wilco Dijkstra <wdijkstr@arm.com> + * config/aarch64/aarch64.c (aarch64_modes_tieable_p): + Allow scalar/single vector modes to be tieable. + +2016-06-20 Wilco Dijkstra <wdijkstr@arm.com> + * config/arm/cortex-a57.md (cortex_a57_fp_cpys): Add fcsel. 2016-06-20 Kyrylo Tkachov <kyrylo.tkachov@arm.com> diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index 4497002707e..46c917a17bc 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -12819,7 +12819,14 @@ aarch64_reverse_mask (enum machine_mode mode) return force_reg (V16QImode, mask); } -/* Implement MODES_TIEABLE_P. */ +/* Implement MODES_TIEABLE_P. In principle we should always return true. + However due to issues with register allocation it is preferable to avoid + tieing integer scalar and FP scalar modes. Executing integer operations + in general registers is better than treating them as scalar vector + operations. This reduces latency and avoids redundant int<->FP moves. + So tie modes if they are either the same class, or vector modes with + other vector modes, vector structs or any scalar mode. +*/ bool aarch64_modes_tieable_p (machine_mode mode1, machine_mode mode2) @@ -12830,9 +12837,12 @@ aarch64_modes_tieable_p (machine_mode mode1, machine_mode mode2) /* We specifically want to allow elements of "structure" modes to be tieable to the structure. This more general condition allows other rarer situations too. */ - if (TARGET_SIMD - && aarch64_vector_mode_p (mode1) - && aarch64_vector_mode_p (mode2)) + if (aarch64_vector_mode_p (mode1) && aarch64_vector_mode_p (mode2)) + return true; + + /* Also allow any scalar modes with vectors. */ + if (aarch64_vector_mode_supported_p (mode1) + || aarch64_vector_mode_supported_p (mode2)) return true; return false; |