[llvm] ba8dc06 - [llubi] Add support for pext/pdep (#227803)

[via llvm-commits]

Author: Yingwei Zheng
Date: 2026-10-01T04:53:04Z
New Revision: ba8dc064464d5785323977c5c50e02f62b895caa

URL: https://github.com/llvm/llvm-project/commit/ba8dc064464d5785323977c5c50e02f62b895caa
DIFF: https://github.com/llvm/llvm-project/commit/ba8dc064464d5785323977c5c50e02f62b895caa.diff

LOG: [llubi] Add support for pext/pdep (#227803)

Added: 
    

Modified: 
    llvm/test/tools/llubi/intr_int_arith.ll
    llvm/tools/llubi/lib/Interpreter.cpp

Removed: 
    


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diff  --git a/llvm/test/tools/llubi/intr_int_arith.ll b/llvm/test/tools/llubi/intr_int_arith.ll
index a30a82b4f6bbf..34eaae5554d18 100644
--- a/llvm/test/tools/llubi/intr_int_arith.ll
+++ b/llvm/test/tools/llubi/intr_int_arith.ll
@@ -43,6 +43,16 @@ define void @main() {
     call i4 @llvm.umulh.i4(i4 -4, i4 poison)
     call <2 x i32> @llvm.umulh.v2i32(<2 x i32> <i32 1, i32 -4>, <2 x i32> <i32 2, i32 6>)
 
+    call i8 @llvm.pext.i8(i8 170, i8 204)
+    call i8 @llvm.pext.i8(i8 -1, i8 170)
+    call i8 @llvm.pext.i8(i8 -1, i8 poison)
+    call <2 x i8> @llvm.pext.v2i8(<2 x i8> <i8 170, i8 -1>, <2 x i8> <i8 204, i8 170>)
+
+    call i8 @llvm.pdep.i8(i8 10, i8 204)
+    call i8 @llvm.pdep.i8(i8 15, i8 170)
+    call i8 @llvm.pdep.i8(i8 15, i8 poison)
+    call <2 x i8> @llvm.pext.v2i8(<2 x i8> <i8 10, i8 15>, <2 x i8> <i8 204, i8 170>)
+
     ret void
 }
 ; CHECK: Entering function: main
@@ -82,5 +92,13 @@ define void @main() {
 ; CHECK-NEXT:   %34 = call i4 @llvm.umulh.i4(i4 -4, i4 6) => i4 4
 ; CHECK-NEXT:   %35 = call i4 @llvm.umulh.i4(i4 -4, i4 poison) => poison
 ; CHECK-NEXT:   %36 = call <2 x i32> @llvm.umulh.v2i32(<2 x i32> <i32 1, i32 -4>, <2 x i32> <i32 2, i32 6>) => { i32 0, i32 5 }
+; CHECK-NEXT:   %37 = call i8 @llvm.pext.i8(i8 -86, i8 -52) => i8 10
+; CHECK-NEXT:   %38 = call i8 @llvm.pext.i8(i8 -1, i8 -86) => i8 15
+; CHECK-NEXT:   %39 = call i8 @llvm.pext.i8(i8 -1, i8 poison) => poison
+; CHECK-NEXT:   %40 = call <2 x i8> @llvm.pext.v2i8(<2 x i8> <i8 -86, i8 -1>, <2 x i8> <i8 -52, i8 -86>) => { i8 10, i8 15 }
+; CHECK-NEXT:   %41 = call i8 @llvm.pdep.i8(i8 10, i8 -52) => i8 -120
+; CHECK-NEXT:   %42 = call i8 @llvm.pdep.i8(i8 15, i8 -86) => i8 -86
+; CHECK-NEXT:   %43 = call i8 @llvm.pdep.i8(i8 15, i8 poison) => poison
+; CHECK-NEXT:   %44 = call <2 x i8> @llvm.pext.v2i8(<2 x i8> <i8 10, i8 15>, <2 x i8> <i8 -52, i8 -86>) => { i8 2, i8 3 }
 ; CHECK-NEXT:   ret void
 ; CHECK-NEXT: Exiting function: main

diff  --git a/llvm/tools/llubi/lib/Interpreter.cpp b/llvm/tools/llubi/lib/Interpreter.cpp
index c29cb1c1f7e36..f3071cf1d7464 100644
--- a/llvm/tools/llubi/lib/Interpreter.cpp
+++ b/llvm/tools/llubi/lib/Interpreter.cpp
@@ -1366,6 +1366,14 @@ class InstExecutor : public InstVisitor<InstExecutor, void>,
             return IID == Intrinsic::smulh ? APIntOps::mulhs(LHS, RHS)
                                            : APIntOps::mulhu(LHS, RHS);
           });
+    case Intrinsic::pdep:
+    case Intrinsic::pext:
+      return visitIntBinOpWithResult(
+          RetTy, Args[0], Args[1],
+          [IID](const APInt &Val, const APInt &Mask) -> AnyValue {
+            return IID == Intrinsic::pdep ? APIntOps::pdep(Val, Mask)
+                                          : APIntOps::pext(Val, Mask);
+          });
     case Intrinsic::vector_reduce_add:
     case Intrinsic::vector_reduce_mul:
     case Intrinsic::vector_reduce_and: