https://github.com/guy-david updated
https://github.com/llvm/llvm-project/pull/147184
>From 3336929fcd243162d2063998a2624017e4e89143 Mon Sep 17 00:00:00 2001
From: Guy David <guyd...@gmail.com>
Date: Sun, 6 Jul 2025 15:22:38 +0300
Subject: [PATCH] [PowerPC] Test SPE incompatibility with VSX
PPCSubtarget is not always initialized, depending on which passes are running,
and in our downstream fork, -enable-matrix is the default configuration
(regardless of whether matrix intrinsics are present in the IR), which triggers
a fatal error in builtins-ppc-fpconstrained.c.
---
clang/test/CodeGen/PowerPC/builtins-ppc-fpconstrained.c | 2 +-
llvm/test/CodeGen/PowerPC/spe-vsx-incompatibility.ll | 8 ++++++++
2 files changed, 9 insertions(+), 1 deletion(-)
create mode 100644 llvm/test/CodeGen/PowerPC/spe-vsx-incompatibility.ll
diff --git a/clang/test/CodeGen/PowerPC/builtins-ppc-fpconstrained.c
b/clang/test/CodeGen/PowerPC/builtins-ppc-fpconstrained.c
index 838db02415fe5..b46fa9f2cf157 100644
--- a/clang/test/CodeGen/PowerPC/builtins-ppc-fpconstrained.c
+++ b/clang/test/CodeGen/PowerPC/builtins-ppc-fpconstrained.c
@@ -11,7 +11,7 @@
// RUN: -S -ffp-exception-behavior=strict \
// RUN: -o - %s | FileCheck --check-prefix=CHECK-ASM \
// RUN: --check-prefix=FIXME-CHECK %s
-// RUN: %clang_cc1 -triple powerpcspe -ffp-exception-behavior=strict \
+// RUN: %clang_cc1 -triple powerpc -ffp-exception-behavior=strict \
// RUN: -target-feature +vsx -fexperimental-strict-floating-point -emit-llvm \
// RUN: %s -o - | FileCheck --check-prefix=CHECK-CONSTRAINED %s
diff --git a/llvm/test/CodeGen/PowerPC/spe-vsx-incompatibility.ll
b/llvm/test/CodeGen/PowerPC/spe-vsx-incompatibility.ll
new file mode 100644
index 0000000000000..06c8f9a3b4bb6
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/spe-vsx-incompatibility.ll
@@ -0,0 +1,8 @@
+; Adding -enable-matrix, which is disabled by default, forces the
initialization
+; of the PPCSubtarget which verifies the incompatible CPU features.
+; RUN: not llc -mtriple=powerpcspe -mattr=+vsx -enable-matrix < %s 2>&1 |
FileCheck %s
+
+; CHECK: SPE and traditional floating point cannot both be enabled
+define void @test() {
+ ret void
+}
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