[llvm] [RISCV] Use EXTLOAD in lowerVECTOR_SHUFFLE. (PR #97862)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-risc-v

Author: Craig Topper (topperc)

<details>
<summary>Changes</summary>

We're creating a load and a splat. The splat doesn't use the extended bits so it doesn't matter what extend we use.

---
Full diff: https://github.com/llvm/llvm-project/pull/97862.diff


2 Files Affected:

- (modified) llvm/lib/Target/RISCV/RISCVISelLowering.cpp (+1-1) 
- (modified) llvm/test/CodeGen/RISCV/rvv/fixed-vectors-reduction-int.ll (+1-1) 


``````````diff
diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
index 022b8bcedda4d..0f9a6be34df50 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -5062,7 +5062,7 @@ static SDValue lowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG,
                           Ld->getOriginalAlign(),
                           Ld->getMemOperand()->getFlags());
         else
-          V = DAG.getExtLoad(ISD::SEXTLOAD, DL, XLenVT, Ld->getChain(), NewAddr,
+          V = DAG.getExtLoad(ISD::EXTLOAD, DL, XLenVT, Ld->getChain(), NewAddr,
                              Ld->getPointerInfo().getWithOffset(Offset), SVT,
                              Ld->getOriginalAlign(),
                              Ld->getMemOperand()->getFlags());
diff --git a/llvm/test/CodeGen/RISCV/rvv/fixed-vectors-reduction-int.ll b/llvm/test/CodeGen/RISCV/rvv/fixed-vectors-reduction-int.ll
index 28ce6a12c4c89..f67282f9e6a32 100644
--- a/llvm/test/CodeGen/RISCV/rvv/fixed-vectors-reduction-int.ll
+++ b/llvm/test/CodeGen/RISCV/rvv/fixed-vectors-reduction-int.ll
@@ -5863,7 +5863,7 @@ define i8 @vreduce_mul_v2i8(ptr %x) {
 ; CHECK:       # %bb.0:
 ; CHECK-NEXT:    vsetivli zero, 2, e8, mf8, ta, ma
 ; CHECK-NEXT:    vle8.v v8, (a0)
-; CHECK-NEXT:    lb a0, 1(a0)
+; CHECK-NEXT:    lbu a0, 1(a0)
 ; CHECK-NEXT:    vmul.vx v8, v8, a0
 ; CHECK-NEXT:    vmv.x.s a0, v8
 ; CHECK-NEXT:    ret

``````````

</details>


https://github.com/llvm/llvm-project/pull/97862