[llvm] [Hexagon] Fix SplitVectors crash in HVX type legalization (PR #181377)

[Brian Cain via llvm-commits]

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@@ -0,0 +1,23 @@
+; RUN: llc -mtriple=hexagon -mcpu=hexagonv73 -mattr=+hvxv73,+hvx-length128b \
+; RUN:   -enable-legalize-types-checking < %s | FileCheck %s
+;
+; Check that HVX zero-extend operations that require splitting compile
+; correctly. The bug was that multi-step TL_EXTEND operations (e.g., i8->i32)
+; were split directly, creating sub-HVX operand types (v64i8) that confused
+; the legalizer's map tracking. The fix expands multi-step extends into
+; single steps first.
+
+target datalayout = "e-m:e-p:32:32:32-a:0-n16:32-i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048"
+target triple = "hexagon-unknown-linux-musl"
+
+; CHECK-LABEL: test_zext_split:
+; CHECK-DAG:   vunpack
+; CHECK-DAG:   vadd
+; CHECK:       jumpr r31
+define fastcc <32 x i32> @test_zext_split(<32 x i8> %a, <32 x i8> %b) {
+entry:
+  %ext_a = zext <32 x i8> %a to <32 x i32>
+  %ext_b = zext <32 x i8> %b to <32 x i32>
+  %sum = add <32 x i32> %ext_a, %ext_b
+  ret <32 x i32> %sum
+}
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androm3da wrote:

done, thanks

https://github.com/llvm/llvm-project/pull/181377