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[PowerPC] Don't use rldicl for PPC32

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According to https://www.ibm.com/support/knowledgecenter/ssw_aix_72/assembler/idalangref_rldicl_rletdw_instrs.html rldicl should not be used when targeting 32bit CPUs.

Reviewed By: #powerpc, nemanjai, MaskRay

Differential Revision: https://reviews.llvm.org/D77946
This commit is contained in:
LemonBoy 2020-04-18 12:55:18 -07:00 committed by Fangrui Song
parent 13d5cb59cb
commit ebaa6ecfb8
2 changed files with 92 additions and 2 deletions
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7
lib/Target/PowerPC/PPCInstrInfo.td
View File

@ -5068,8 +5068,11 @@ def RotateInsertByte1 {
dag Left = (RLWIMI RotateInsertByte3.Left, Swap4.Bits, 8, 24, 31);
}
def : Pat<(i32 (bitreverse i32:$A)),
(RLDICL_32 RotateInsertByte1.Left, 0, 32)>;
// Clear the upper half of the register when in 64-bit mode
let Predicates = [In64BitMode] in
def : Pat<(i32 (bitreverse i32:$A)), (RLDICL_32 RotateInsertByte1.Left, 0, 32)>;
let Predicates = [In32BitMode] in
def : Pat<(i32 (bitreverse i32:$A)), RotateInsertByte1.Left>;
// Fast 64-bit reverse bits algorithm:
// Step 1: 1-bit swap (swap odd 1-bit and even 1-bit):

87
test/CodeGen/PowerPC/testBitReverse.ll
View File

@ -1,8 +1,43 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -verify-machineinstrs -mtriple=powerpc -mcpu=ppc32 < %s | FileCheck %s --check-prefix=PPC32
; RUN: llc -verify-machineinstrs -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr8 < %s | FileCheck %s
; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu -mcpu=pwr8 < %s | FileCheck %s
declare i32 @llvm.bitreverse.i32(i32)
define i32 @testBitReverseIntrinsicI32(i32 %arg) {
; PPC32-LABEL: testBitReverseIntrinsicI32:
; PPC32: # %bb.0:
; PPC32-NEXT: lis 4, -21846
; PPC32-NEXT: ori 4, 4, 43690
; PPC32-NEXT: slwi 5, 3, 1
; PPC32-NEXT: and 4, 5, 4
; PPC32-NEXT: lis 5, 21845
; PPC32-NEXT: ori 5, 5, 21845
; PPC32-NEXT: srwi 3, 3, 1
; PPC32-NEXT: and 3, 3, 5
; PPC32-NEXT: lis 5, -13108
; PPC32-NEXT: or 3, 3, 4
; PPC32-NEXT: ori 5, 5, 52428
; PPC32-NEXT: slwi 4, 3, 2
; PPC32-NEXT: and 4, 4, 5
; PPC32-NEXT: lis 5, 13107
; PPC32-NEXT: ori 5, 5, 13107
; PPC32-NEXT: srwi 3, 3, 2
; PPC32-NEXT: and 3, 3, 5
; PPC32-NEXT: lis 5, -3856
; PPC32-NEXT: or 3, 3, 4
; PPC32-NEXT: ori 5, 5, 61680
; PPC32-NEXT: slwi 4, 3, 4
; PPC32-NEXT: and 4, 4, 5
; PPC32-NEXT: lis 5, 3855
; PPC32-NEXT: ori 5, 5, 3855
; PPC32-NEXT: srwi 3, 3, 4
; PPC32-NEXT: and 3, 3, 5
; PPC32-NEXT: or 4, 3, 4
; PPC32-NEXT: rotlwi 3, 4, 24
; PPC32-NEXT: rlwimi 3, 4, 8, 8, 15
; PPC32-NEXT: rlwimi 3, 4, 8, 24, 31
; PPC32-NEXT: blr
;
; CHECK-LABEL: testBitReverseIntrinsicI32:
; CHECK: # %bb.0:
; CHECK-NEXT: lis 4, -21846
@ -43,6 +78,58 @@ define i32 @testBitReverseIntrinsicI32(i32 %arg) {
declare i64 @llvm.bitreverse.i64(i64)
define i64 @testBitReverseIntrinsicI64(i64 %arg) {
; PPC32-LABEL: testBitReverseIntrinsicI64:
; PPC32: # %bb.0:
; PPC32-NEXT: lis 5, -21846
; PPC32-NEXT: lis 6, 21845
; PPC32-NEXT: ori 5, 5, 43690
; PPC32-NEXT: slwi 10, 4, 1
; PPC32-NEXT: slwi 11, 3, 1
; PPC32-NEXT: ori 6, 6, 21845
; PPC32-NEXT: srwi 4, 4, 1
; PPC32-NEXT: srwi 3, 3, 1
; PPC32-NEXT: and 10, 10, 5
; PPC32-NEXT: and 5, 11, 5
; PPC32-NEXT: and 4, 4, 6
; PPC32-NEXT: and 3, 3, 6
; PPC32-NEXT: lis 7, -13108
; PPC32-NEXT: lis 8, 13107
; PPC32-NEXT: or 4, 4, 10
; PPC32-NEXT: or 3, 3, 5
; PPC32-NEXT: ori 7, 7, 52428
; PPC32-NEXT: ori 8, 8, 13107
; PPC32-NEXT: slwi 5, 4, 2
; PPC32-NEXT: srwi 4, 4, 2
; PPC32-NEXT: slwi 6, 3, 2
; PPC32-NEXT: srwi 3, 3, 2
; PPC32-NEXT: and 5, 5, 7
; PPC32-NEXT: and 4, 4, 8
; PPC32-NEXT: and 6, 6, 7
; PPC32-NEXT: and 3, 3, 8
; PPC32-NEXT: lis 9, -3856
; PPC32-NEXT: lis 11, 3855
; PPC32-NEXT: or 4, 4, 5
; PPC32-NEXT: or 3, 3, 6
; PPC32-NEXT: ori 9, 9, 61680
; PPC32-NEXT: ori 11, 11, 3855
; PPC32-NEXT: slwi 5, 4, 4
; PPC32-NEXT: srwi 4, 4, 4
; PPC32-NEXT: slwi 6, 3, 4
; PPC32-NEXT: srwi 3, 3, 4
; PPC32-NEXT: and 5, 5, 9
; PPC32-NEXT: and 4, 4, 11
; PPC32-NEXT: and 6, 6, 9
; PPC32-NEXT: and 3, 3, 11
; PPC32-NEXT: or 5, 4, 5
; PPC32-NEXT: or 6, 3, 6
; PPC32-NEXT: rotlwi 3, 5, 24
; PPC32-NEXT: rotlwi 4, 6, 24
; PPC32-NEXT: rlwimi 3, 5, 8, 8, 15
; PPC32-NEXT: rlwimi 4, 6, 8, 8, 15
; PPC32-NEXT: rlwimi 3, 5, 8, 24, 31
; PPC32-NEXT: rlwimi 4, 6, 8, 24, 31
; PPC32-NEXT: blr
;
; CHECK-LABEL: testBitReverseIntrinsicI64:
; CHECK: # %bb.0:
; CHECK-NEXT: lis 4, -21846