commit 3035cf0bed7058e45ca70cb33face93d7dc1ce9c
Author: Kyrylo Tkachov <kyrylo.tkachov@arm.com>
Date: Fri Nov 14 09:16:08 2014 +0000
[AArch64][apinski] CMP+branch macro fusion
@@ -310,6 +310,7 @@ static const struct cpu_vector_cost cortexa57_vector_cost =
#define AARCH64_FUSE_ADRP_ADD (1 << 1)
#define AARCH64_FUSE_MOVK_MOVK (1 << 2)
#define AARCH64_FUSE_ADRP_LDR (1 << 3)
+#define AARCH64_FUSE_CMP_BRANCH (1 << 4)
#if HAVE_DESIGNATED_INITIALIZERS && GCC_VERSION >= 2007
__extension__
@@ -356,7 +357,7 @@ static const struct tune_params thunderx_tunings =
&generic_vector_cost,
NAMED_PARAM (memmov_cost, 6),
NAMED_PARAM (issue_rate, 2),
- NAMED_PARAM (fuseable_ops, AARCH64_FUSE_NOTHING)
+ NAMED_PARAM (fuseable_ops, AARCH64_FUSE_CMP_BRANCH)
};
/* A processor implementing AArch64. */
@@ -10522,6 +10523,20 @@ aarch_macro_fusion_pair_p (rtx_insn *prev, rtx_insn *curr)
}
}
+ if ((aarch64_tune_params->fuseable_ops & AARCH64_FUSE_CMP_BRANCH)
+ && any_condjump_p (curr))
+ {
+ enum attr_type prev_type = get_attr_type (prev);
+
+ /* FIXME: this misses some which is considered simple arthematic
+ instructions for ThunderX. Simple shifts are missed here. */
+ if (prev_type == TYPE_ALUS_SREG
+ || prev_type == TYPE_ALUS_IMM
+ || prev_type == TYPE_LOGICS_REG
+ || prev_type == TYPE_LOGICS_IMM)
+ return true;
+ }
+
return false;
}