-//===- X86InstrShiftRotate.td - Shift and Rotate Instrs ----*- tablegen -*-===//
-//
+//===-- X86InstrShiftRotate.td - Shift and Rotate Instrs ---*- tablegen -*-===//
+//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
//
// This file describes the shift and rotate instructions.
} // Defs = [EFLAGS]
+def ROT32L2R_imm8 : SDNodeXForm<imm, [{
+ // Convert a ROTL shamt to a ROTR shamt on 32-bit integer.
+ return getI8Imm(32 - N->getZExtValue());
+}]>;
+
+def ROT64L2R_imm8 : SDNodeXForm<imm, [{
+ // Convert a ROTL shamt to a ROTR shamt on 64-bit integer.
+ return getI8Imm(64 - N->getZExtValue());
+}]>;
+
multiclass bmi_rotate<string asm, RegisterClass RC, X86MemOperand x86memop> {
let neverHasSideEffects = 1 in {
def ri : Ii8<0xF0, MRMSrcReg, (outs RC:$dst), (ins RC:$src1, i8imm:$src2),
defm SHRX64 : bmi_shift<"shrx{q}", GR64, i64mem>, T8XD, VEX_W;
defm SHLX32 : bmi_shift<"shlx{l}", GR32, i32mem>, T8, OpSize;
defm SHLX64 : bmi_shift<"shlx{q}", GR64, i64mem>, T8, OpSize, VEX_W;
+
+ // Prefer RORX which is non-destructive and doesn't update EFLAGS.
+ let AddedComplexity = 10 in {
+ def : Pat<(rotl GR32:$src, (i8 imm:$shamt)),
+ (RORX32ri GR32:$src, (ROT32L2R_imm8 imm:$shamt))>;
+ def : Pat<(rotl GR64:$src, (i8 imm:$shamt)),
+ (RORX64ri GR64:$src, (ROT64L2R_imm8 imm:$shamt))>;
+ }
+
+ def : Pat<(rotl (loadi32 addr:$src), (i8 imm:$shamt)),
+ (RORX32mi addr:$src, (ROT32L2R_imm8 imm:$shamt))>;
+ def : Pat<(rotl (loadi64 addr:$src), (i8 imm:$shamt)),
+ (RORX64mi addr:$src, (ROT64L2R_imm8 imm:$shamt))>;
}