support movberr to bswap

Author: XinWang10

llvm/lib/Target/X86/X86InstrMisc.td

@@ -229,7 +229,7 @@ def PUSHA16  : I<0x60, RawFrm, (outs), (ins), "pushaw", []>,
                OpSize16, Requires<[Not64BitMode]>;
 }
 
-let Constraints = "$src = $dst", SchedRW = [WriteBSWAP32], Predicates = [NoNDD] in {
+let Constraints = "$src = $dst", SchedRW = [WriteBSWAP32], Predicates = [NoNDD_Or_NoMOVBE] in {
 // This instruction is a consequence of BSWAP32r observing operand size. The
 // encoding is valid, but the behavior is undefined.
 let isCodeGenOnly = 1, ForceDisassemble = 1, hasSideEffects = 0 in

llvm/lib/Target/X86/X86InstrPredicates.td

@@ -122,6 +122,7 @@ def HasTBM       : Predicate<"Subtarget->hasTBM()">;
 def NoTBM        : Predicate<"!Subtarget->hasTBM()">;
 def HasLWP       : Predicate<"Subtarget->hasLWP()">;
 def HasMOVBE     : Predicate<"Subtarget->hasMOVBE()">;
+def NoNDD_Or_NoMOVBE     : Predicate<"!Subtarget->hasNDD() || !Subtarget->hasMOVBE()">;
 def HasRDRAND    : Predicate<"Subtarget->hasRDRAND()">;
 def HasF16C      : Predicate<"Subtarget->hasF16C()">;
 def HasFSGSBase  : Predicate<"Subtarget->hasFSGSBase()">;

llvm/test/CodeGen/X86/apx/compress-evex.mir

@@ -71,3 +71,13 @@ body:             |
     renamable $rax = XOR64rr_NF_ND killed renamable $rax, killed renamable $r16
     RET64 $rax
 ...
+---
+name:            bswapr_to_movberr
+body:             |
+  bb.0.entry:
+    liveins: $rdi
+    ; CHECK: bswapq  %rax                            # EVEX TO LEGACY Compression encoding: [0x48,0x0f,0xcf]
+    renamable $rax = MOVBE64rr killed renamable $rdi
+    RET64 killed $rax
+
+...

llvm/test/CodeGen/X86/movbe.ll

@@ -182,7 +182,7 @@ define i64 @test7(i64 %x) nounwind {
 ;
 ; EGPR-LABEL: test7:
 ; EGPR:       # %bb.0:
-; EGPR-NEXT:    movbeq %rdi, %rax # encoding: [0x62,0xf4,0xfc,0x08,0x61,0xf8]
+; EGPR-NEXT:    bswapq %rax # EVEX TO LEGACY Compression encoding: [0x48,0x0f,0xcf]
 ; EGPR-NEXT:    retq # encoding: [0xc3]
   %bswap = call i64 @llvm.bswap.i64(i64 %x)
   ret i64 %bswap

llvm/utils/TableGen/X86ManualCompressEVEXTables.def

@@ -328,4 +328,6 @@ ENTRY(VBROADCASTSDZ256rm, VBROADCASTSDYrm)
 ENTRY(VBROADCASTSDZ256rr, VBROADCASTSDYrr)
 ENTRY(VPBROADCASTQZ256rm, VPBROADCASTQYrm)
 ENTRY(VPBROADCASTQZ256rr, VPBROADCASTQYrr)
+ENTRY(MOVBE32rr, BSWAP32r)
+ENTRY(MOVBE64rr, BSWAP64r)
 #undef ENTRY