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[XCore] Add instruction pattern for bitrev 

Summary:
Add support for lowering bitreverse to the bitrev instruction.
Fix https://bugs.llvm.org/show_bug.cgi?id=34628.

Reviewers: RKSimon, rtrieu, robertlytton

Reviewed By: RKSimon

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D74748
This commit is contained in:
Jim Lin 2020-02-21 09:28:49 +08:00
parent 7593a480db
commit e27b61c1ea
3 changed files with 59 additions and 0 deletions
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1
llvm/lib/Target/XCore/XCoreISelLowering.cpp
View File

@ -107,6 +107,7 @@ XCoreTargetLowering::XCoreTargetLowering(const TargetMachine &TM,
setOperationAction(ISD::CTPOP, MVT::i32, Expand);
setOperationAction(ISD::ROTL , MVT::i32, Expand);
setOperationAction(ISD::ROTR , MVT::i32, Expand);
setOperationAction(ISD::BITREVERSE , MVT::i32, Legal);
setOperationAction(ISD::TRAP, MVT::Other, Legal);

3
llvm/lib/Target/XCore/XCoreInstrInfo.td
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@ -1154,6 +1154,9 @@ def : Pat<(store GRRegs:$val, (add GRRegs:$addr, immUs4:$offset)),
def : Pat<(store GRRegs:$val, GRRegs:$addr),
(STW_2rus GRRegs:$val, GRRegs:$addr, 0)>;
/// bitrev
def : Pat<(bitreverse GRRegs:$src), (BITREV_l2r GRRegs:$src)>;
/// cttz
def : Pat<(cttz GRRegs:$src), (CLZ_l2r (BITREV_l2r GRRegs:$src))>;

55
llvm/test/CodeGen/XCore/bitrev.ll Normal file
View File

@ -0,0 +1,55 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -march=xcore | FileCheck %s
declare i8 @llvm.bitreverse.i8(i8)
declare i16 @llvm.bitreverse.i16(i16)
declare i32 @llvm.bitreverse.i32(i32)
declare i64 @llvm.bitreverse.i64(i64)
define i8 @bitrev8(i8 %x) nounwind {
; CHECK-LABEL: bitrev8:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: bitrev r0, r0
; CHECK-NEXT: shr r0, r0, 24
; CHECK-NEXT: retsp 0
; CHECK-NEXT: .cc_bottom bitrev8.function
entry:
%0 = call i8 @llvm.bitreverse.i8(i8 %x)
ret i8 %0
}
define i16 @bitrev16(i16 %x) nounwind {
; CHECK-LABEL: bitrev16:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: bitrev r0, r0
; CHECK-NEXT: shr r0, r0, 16
; CHECK-NEXT: retsp 0
; CHECK-NEXT: .cc_bottom bitrev16.function
entry:
%0 = call i16 @llvm.bitreverse.i16(i16 %x)
ret i16 %0
}
define i32 @bitrev32(i32 %x) nounwind {
; CHECK-LABEL: bitrev32:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: bitrev r0, r0
; CHECK-NEXT: retsp 0
; CHECK-NEXT: .cc_bottom bitrev32.function
entry:
%0 = call i32 @llvm.bitreverse.i32(i32 %x)
ret i32 %0
}
define i64 @bitrev64(i64 %x) nounwind {
; CHECK-LABEL: bitrev64:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: bitrev r2, r1
; CHECK-NEXT: bitrev r1, r0
; CHECK-NEXT: mov r0, r2
; CHECK-NEXT: retsp 0
; CHECK-NEXT: .cc_bottom bitrev64.function
entry:
%0 = call i64 @llvm.bitreverse.i64(i64 %x)
ret i64 %0
}