From 6ee90f4f911fcea21badc666ca8a70067756ef7a Mon Sep 17 00:00:00 2001 From: wilco Date: Wed, 18 Jan 2017 18:23:34 +0000 Subject: [PATCH] SHA1H instructions may be scheduled after a SHA1C instruction that uses the same input register. However SHA1C updates its input, so if SHA1H is scheduled after it, it requires an extra move. Increase the priority of SHA1H to ensure it gets scheduled earlier, avoiding the move. gcc/ * config/aarch64/aarch64.c (aarch64_sched_adjust_priority) New function. (TARGET_SCHED_ADJUST_PRIORITY): Define target hook. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@244586 138bc75d-0d04-0410-961f-82ee72b054a4 --- gcc/ChangeLog | 6 ++++++ gcc/config/aarch64/aarch64.c | 23 +++++++++++++++++++++++ 2 files changed, 29 insertions(+) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 8c4b9888527..507320d5757 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2017-01-18 Wilco Dijkstra + + * config/aarch64/aarch64.c (aarch64_sched_adjust_priority) + New function. + (TARGET_SCHED_ADJUST_PRIORITY): Define target hook. + 2017-01-18 Maxim Ostapenko PR lto/79061 diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index 27f2dc9c1c7..39a58804ab6 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -14070,6 +14070,26 @@ aarch64_sched_fusion_priority (rtx_insn *insn, int max_pri, return; } +/* Implement the TARGET_SCHED_ADJUST_PRIORITY hook. + Adjust priority of sha1h instructions so they are scheduled before + other SHA1 instructions. */ + +static int +aarch64_sched_adjust_priority (rtx_insn *insn, int priority) +{ + rtx x = PATTERN (insn); + + if (GET_CODE (x) == SET) + { + x = SET_SRC (x); + + if (GET_CODE (x) == UNSPEC && XINT (x, 1) == UNSPEC_SHA1H) + return priority + 10; + } + + return priority; +} + /* Given OPERANDS of consecutive load/store, check if we can merge them into ldp/stp. LOAD is true if they are load instructions. MODE is the mode of memory operands. */ @@ -14991,6 +15011,9 @@ aarch64_libgcc_floating_mode_supported_p #undef TARGET_CAN_USE_DOLOOP_P #define TARGET_CAN_USE_DOLOOP_P can_use_doloop_if_innermost +#undef TARGET_SCHED_ADJUST_PRIORITY +#define TARGET_SCHED_ADJUST_PRIORITY aarch64_sched_adjust_priority + #undef TARGET_SCHED_MACRO_FUSION_P #define TARGET_SCHED_MACRO_FUSION_P aarch64_macro_fusion_p -- 2.11.4.GIT