Hi all,Sometimes we want to fuse adrp+ldr pairs as described in the comment in the patch.
This is enabled by default for the Cortex-A53.
Bootstrapped and tested on aarch64-none-linux. Ok for trunk? Thanks, Kyrill 2014-11-18 Kyrylo Tkachov <kyrylo.tkac...@arm.com> * config/aarch64/aarch64.c (AARCH64_FUSE_ADRP_LDR): Define. (cortexa53_tunings): Specify AARCH64_FUSE_ADRP_LDR in fuseable_ops. (aarch_macro_fusion_pair_p): Handle AARCH64_FUSE_ADRP_LDR.
commit ad175271f82e0330894bfe894e86f7ad8a4b6cce Author: Kyrylo Tkachov <kyrylo.tkac...@arm.com> Date: Thu Nov 13 16:48:18 2014 +0000 [AArch64][tmp] Fuse ADRP+LDR diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index 85e08d0..132535c 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -307,6 +307,7 @@ static const struct cpu_vector_cost cortexa57_vector_cost = #define AARCH64_FUSE_MOV_MOVK (1 << 0) #define AARCH64_FUSE_ADRP_ADD (1 << 1) #define AARCH64_FUSE_MOVK_MOVK (1 << 2) +#define AARCH64_FUSE_ADRP_LDR (1 << 3) #if HAVE_DESIGNATED_INITIALIZERS && GCC_VERSION >= 2007 __extension__ @@ -330,7 +331,8 @@ static const struct tune_params cortexa53_tunings = &generic_vector_cost, NAMED_PARAM (memmov_cost, 4), NAMED_PARAM (issue_rate, 2), - NAMED_PARAM (fuseable_ops, (AARCH64_FUSE_MOV_MOVK | AARCH64_FUSE_ADRP_ADD | AARCH64_FUSE_MOVK_MOVK)) + NAMED_PARAM (fuseable_ops, (AARCH64_FUSE_MOV_MOVK | AARCH64_FUSE_ADRP_ADD + | AARCH64_FUSE_MOVK_MOVK | AARCH64_FUSE_ADRP_LDR)) }; static const struct tune_params cortexa57_tunings = @@ -10467,6 +10469,37 @@ aarch_macro_fusion_pair_p (rtx_insn *prev, rtx_insn *curr) return true; } + if (simple_sets_p + && (aarch64_tune_params->fuseable_ops & AARCH64_FUSE_ADRP_LDR)) + { + /* We're trying to match: + prev (adrp) == (set (reg r0) + (high (symbol_ref ("SYM")))) + curr (ldr) == (set (reg r1) + (mem (lo_sum (reg r0) + (symbol_ref ("SYM"))))) + or + curr (ldr) == (set (reg r1) + (zero_extend (mem + (lo_sum (reg r0) + (symbol_ref ("SYM")))))) */ + if (satisfies_constraint_Ush (SET_SRC (prev_set)) + && REG_P (SET_DEST (prev_set)) && REG_P (SET_DEST (curr_set))) + { + rtx curr_src = SET_SRC (curr_set); + + if (GET_CODE (curr_src) == ZERO_EXTEND) + curr_src = XEXP (curr_src, 0); + + if (MEM_P (curr_src) && GET_CODE (XEXP (curr_src, 0)) == LO_SUM + && REG_P (XEXP (XEXP (curr_src, 0), 0)) + && REGNO (XEXP (XEXP (curr_src, 0), 0)) + == REGNO (SET_DEST (prev_set)) + && rtx_equal_p (XEXP (XEXP (curr_src, 0), 1), + XEXP (SET_SRC (prev_set), 0))) + return true; + } + } return false; }