[llvm] f7294ac - [PowerPC] Remove extra swap for extract+vperm on LE

[Qiu Chaofan via llvm-commits]

Author: Qiu Chaofan
Date: 2021-05-07T13:48:08+08:00
New Revision: f7294ac8093a2fbd8c00254580eaac6c4e1f7b24

URL: https://github.com/llvm/llvm-project/commit/f7294ac8093a2fbd8c00254580eaac6c4e1f7b24
DIFF: https://github.com/llvm/llvm-project/commit/f7294ac8093a2fbd8c00254580eaac6c4e1f7b24.diff

LOG: [PowerPC] Remove extra swap for extract+vperm on LE

This is a simple fix on LE. On BE, vector shuffles are categorized into
different ops. We may need more work to eliminate these in
tablegen/pre-isel.

Reviewed By: nemanjai

Differential Revision: https://reviews.llvm.org/D101605

Added: 
    

Modified: 
    llvm/lib/Target/PowerPC/PPCInstrVSX.td
    llvm/test/CodeGen/PowerPC/vec_extract_p9.ll

Removed: 
    


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diff  --git a/llvm/lib/Target/PowerPC/PPCInstrVSX.td b/llvm/lib/Target/PowerPC/PPCInstrVSX.td
index 89c52fd0aaee9..95cf5ba95b13b 100644
--- a/llvm/lib/Target/PowerPC/PPCInstrVSX.td
+++ b/llvm/lib/Target/PowerPC/PPCInstrVSX.td
@@ -2938,6 +2938,9 @@ defm : ScalToVecWPermute<v2f64, (f64 f64:$A),
                                    (SUBREG_TO_REG (i64 1), $A, sub_64), 0),
                          (SUBREG_TO_REG (i64 1), $A, sub_64)>;
 
+def : Pat<(f64 (extractelt (v2f64 (bitconvert (v16i8
+                 (PPCvperm v16i8:$A, v16i8:$B, v16i8:$C)))), 0)),
+          (f64 (EXTRACT_SUBREG (VPERM $B, $A, $C), sub_64))>;
 def : Pat<(f64 (extractelt v2f64:$S, 0)),
           (f64 (EXTRACT_SUBREG (XXPERMDI $S, $S, 2), sub_64))>;
 def : Pat<(f64 (extractelt v2f64:$S, 1)),

diff  --git a/llvm/test/CodeGen/PowerPC/vec_extract_p9.ll b/llvm/test/CodeGen/PowerPC/vec_extract_p9.ll
index 1ce1d4175398c..8f3967403ae66 100644
--- a/llvm/test/CodeGen/PowerPC/vec_extract_p9.ll
+++ b/llvm/test/CodeGen/PowerPC/vec_extract_p9.ll
@@ -182,10 +182,9 @@ define double @test10(<4 x i32> %a, <4 x i32> %b) {
 ; CHECK-LE-NEXT:    addi 3, 3, .LCPI9_0 at toc@l
 ; CHECK-LE-NEXT:    lxvx 36, 0, 3
 ; CHECK-LE-NEXT:    addis 3, 2, .LCPI9_1 at toc@ha
-; CHECK-LE-NEXT:    lfs 1, .LCPI9_1 at toc@l(3)
-; CHECK-LE-NEXT:    vperm 2, 2, 3, 4
-; CHECK-LE-NEXT:    xxswapd 0, 34
-; CHECK-LE-NEXT:    xsadddp 1, 0, 1
+; CHECK-LE-NEXT:    lfs 0, .LCPI9_1 at toc@l(3)
+; CHECK-LE-NEXT:    vperm 2, 3, 2, 4
+; CHECK-LE-NEXT:    xsadddp 1, 34, 0
 ; CHECK-LE-NEXT:    blr
 ;
 ; CHECK-BE-LABEL: test10: