[gcc r14-116] [PR target/108248] [RISC-V] Break down some bitmanip insn types

[gcc r14-116] [PR target/108248] [RISC-V] Break down some bitmanip insn types

[Jeff Law]

https://gcc.gnu.org/g:07e2576d6f344acab338deeb051845c90c1cf6a3

commit r14-116-g07e2576d6f344acab338deeb051845c90c1cf6a3
Author: Raphael Zinsly <rzinsly@ventanamicro.com>
Date:   Thu Apr 20 08:48:08 2023 -0600

    [PR target/108248] [RISC-V] Break down some bitmanip insn types
    
    This is primarily Raphael's work.  All I did was adjust it to apply to the
    trunk and add the new types to generic.md's scheduling model.
    
    The basic idea here is to make sure we have the ability to schedule the
    bitmanip instructions with a finer degree of control.  Some of the bitmanip
    instructions are likely to have differing scheduler characteristics across
    different implementations.
    
    So rather than assign these instructions a generic "bitmanip" type, this
    patch assigns them a type based on their RTL code by using the <bitmanip_insn>
    iterator for the type.  Naturally we have to add a few new types.  It affects
    clz, ctz, cpop, min, max.
    
    We didn't do this for things like shNadd, single bit manipulation, etc. We
    certainly could if the needs presents itself.
    
    I threw all the new types into the generic_alu bucket in the generic
    scheduling model.  Seems as good a place as any. Someone who knows the
    sifive uarch should probably add these types (and bitmanip) to the sifive
    scheduling model.
    
    We also noticed that the recently added orc.b didn't have a type at all.
    So we added it as a generic bitmanip type.
    
    This has been bootstrapped in a gcc-12 base and I've built and run the
    testsuite without regressions on the trunk.
    
    Given it was primarily Raphael's work I could probably approve & commit it.
    But I'd like to give the other RISC-V folks a chance to chime in.
    
            PR target/108248
    gcc/
            * config/riscv/bitmanip.md (clz, ctz, pcnt, min, max patterns): Use
            <bitmanip_insn> as the type to allow for fine grained control of
            scheduling these insns.
            * config/riscv/generic.md (generic_alu): Add bitmanip, clz, ctz, pcnt,
            min, max.
            * config/riscv/riscv.md (type attribute): Add types for clz, ctz,
            pcnt, signed and unsigned min/max.

Diff:
---
 gcc/config/riscv/bitmanip.md | 11 ++++++-----
 gcc/config/riscv/generic.md  |  2 +-
 gcc/config/riscv/riscv.md    |  1 +
 3 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/gcc/config/riscv/bitmanip.md b/gcc/config/riscv/bitmanip.md
index 388ef662820..44ad350c747 100644
--- a/gcc/config/riscv/bitmanip.md
+++ b/gcc/config/riscv/bitmanip.md
@@ -241,7 +241,7 @@
         (clz_ctz_pcnt:SI (match_operand:SI 1 "register_operand" "r")))]
   "TARGET_ZBB"
   "<bitmanip_insn>%~\t%0,%1"
-  [(set_attr "type" "bitmanip")
+  [(set_attr "type" "<bitmanip_insn>")
    (set_attr "mode" "SI")])
 
 (define_insn "*<bitmanip_optab>disi2"
@@ -250,7 +250,7 @@
           (clz_ctz_pcnt:SI (match_operand:SI 1 "register_operand" "r"))))]
   "TARGET_64BIT && TARGET_ZBB"
   "<bitmanip_insn>w\t%0,%1"
-  [(set_attr "type" "bitmanip")
+  [(set_attr "type" "<bitmanip_insn>")
    (set_attr "mode" "SI")])
 
 (define_insn "*<bitmanip_optab>di2"
@@ -258,7 +258,7 @@
         (clz_ctz_pcnt:DI (match_operand:DI 1 "register_operand" "r")))]
   "TARGET_64BIT && TARGET_ZBB"
   "<bitmanip_insn>\t%0,%1"
-  [(set_attr "type" "bitmanip")
+  [(set_attr "type" "<bitmanip_insn>")
    (set_attr "mode" "DI")])
 
 (define_insn "*zero_extendhi<GPR:mode>2_bitmanip"
@@ -357,7 +357,8 @@
   [(set (match_operand:X 0 "register_operand" "=r")
 	(unspec:X [(match_operand:X 1 "register_operand" "r")] UNSPEC_ORC_B))]
   "TARGET_ZBB"
-  "orc.b\t%0,%1")
+  "orc.b\t%0,%1"
+  [(set_attr "type" "bitmanip")])
 
 (define_expand "bswapdi2"
   [(set (match_operand:DI 0 "register_operand")
@@ -406,7 +407,7 @@
 			   (match_operand:X 2 "reg_or_0_operand" "rJ")))]
   "TARGET_ZBB"
   "<bitmanip_insn>\t%0,%1,%z2"
-  [(set_attr "type" "bitmanip")])
+  [(set_attr "type" "<bitmanip_insn>")])
 
 ;; Optimize the common case of a SImode min/max against a constant
 ;; that is safe both for sign- and zero-extension.
diff --git a/gcc/config/riscv/generic.md b/gcc/config/riscv/generic.md
index b98d0ae5258..db4fabbbd92 100644
--- a/gcc/config/riscv/generic.md
+++ b/gcc/config/riscv/generic.md
@@ -27,7 +27,7 @@
 
 (define_insn_reservation "generic_alu" 1
   (and (eq_attr "tune" "generic")
-       (eq_attr "type" "unknown,const,arith,shift,slt,multi,auipc,nop,logical,move"))
+       (eq_attr "type" "unknown,const,arith,shift,slt,multi,auipc,nop,logical,move,bitmanip,smin,smax,umin,umax,clz,ctz,cpop"))
   "alu")
 
 (define_insn_reservation "generic_load" 3
diff --git a/gcc/config/riscv/riscv.md b/gcc/config/riscv/riscv.md
index 1fb29da8a0b..0c69407ac09 100644
--- a/gcc/config/riscv/riscv.md
+++ b/gcc/config/riscv/riscv.md
@@ -344,6 +344,7 @@
   "unknown,branch,jump,call,load,fpload,store,fpstore,
    mtc,mfc,const,arith,logical,shift,slt,imul,idiv,move,fmove,fadd,fmul,
    fmadd,fdiv,fcmp,fcvt,fsqrt,multi,auipc,sfb_alu,nop,ghost,bitmanip,rotate,
+   min,max,minu,maxu,clz,ctz,cpop,
    atomic,condmove,crypto,rdvlenb,rdvl,vsetvl,vlde,vste,vldm,vstm,vlds,vsts,
    vldux,vldox,vstux,vstox,vldff,vldr,vstr,
    vialu,viwalu,vext,vicalu,vshift,vnshift,vicmp,viminmax,