[PATCH] D44836: [X86] Remove ReadAfterLd from BMI and TBM instructions that don't have a register operand in their memory form

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: RKSimon, GGanesh.

The memory form of these instructions only read an input from memory. They don't have any register operands.


https://reviews.llvm.org/D44836

Files:
  lib/Target/X86/X86InstrInfo.td
  lib/Target/X86/X86ScheduleZnver1.td


Index: lib/Target/X86/X86ScheduleZnver1.td
===================================================================
--- lib/Target/X86/X86ScheduleZnver1.td
+++ lib/Target/X86/X86ScheduleZnver1.td
@@ -563,7 +563,7 @@
 // r,r.
 def : InstRW<[ZnWriteALULat2], (instregex "BLS(I|MSK|R)(32|64)rr")>;
 // r,m.
-def : InstRW<[ZnWriteALULat2Ld, ReadAfterLd], (instregex "BLS(I|MSK|R)(32|64)rm")>;
+def : InstRW<[ZnWriteALULat2Ld], (instregex "BLS(I|MSK|R)(32|64)rm")>;
 
 // BEXTR.
 // r,r,r.
Index: lib/Target/X86/X86InstrInfo.td
===================================================================
--- lib/Target/X86/X86InstrInfo.td
+++ lib/Target/X86/X86InstrInfo.td
@@ -2341,7 +2341,7 @@
   let mayLoad = 1 in
   def rm : I<0xF3, MemMRM, (outs RC:$dst), (ins x86memop:$src),
              !strconcat(mnemonic, "\t{$src, $dst|$dst, $src}"),
-             [], IIC_UNARY_MEM>, T8PS, VEX_4V, Sched<[WriteALULd, ReadAfterLd]>;
+             [], IIC_UNARY_MEM>, T8PS, VEX_4V, Sched<[WriteALULd]>;
 }
 }
 
@@ -2535,7 +2535,7 @@
                 !strconcat(OpcodeStr,
                            "\t{$cntl, $src1, $dst|$dst, $src1, $cntl}"),
                 [(set RC:$dst, (Int (ld_frag addr:$src1), immoperator:$cntl))],
-           IIC_BIN_MEM>, XOP, XOPA, Sched<[WriteALULd, ReadAfterLd]>;
+           IIC_BIN_MEM>, XOP, XOPA, Sched<[WriteALULd]>;
 }
 
 defm BEXTRI32 : tbm_ternary_imm_intr<0x10, GR32, "bextr{l}", i32mem, loadi32,
@@ -2555,7 +2555,7 @@
   let mayLoad = 1 in
   def rm : I<opc,  FormMem, (outs RC:$dst), (ins x86memop:$src),
              !strconcat(OpcodeStr,"\t{$src, $dst|$dst, $src}"),
-             [], IIC_BIN_MEM>, XOP_4V, XOP9, Sched<[WriteALULd, ReadAfterLd]>;
+             [], IIC_BIN_MEM>, XOP_4V, XOP9, Sched<[WriteALULd]>;
 }
 }
 


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