Rollup merge of #88350 - programmerjake:add-ppc-cr-xer-clobbers, r=Amanieu

add support for clobbering xer, cr, and cr[0-7] for asm! on OpenPower/PowerPC

Fixes #88315

1 files changed, 48 insertions, 0 deletions

diff --git a/src/test/codegen/asm-powerpc-clobbers.rs b/src/test/codegen/asm-powerpc-clobbers.rs
new file mode 100644
index 00000000000..91a82c60120
--- /dev/null
+++ b/src/test/codegen/asm-powerpc-clobbers.rs
@@ -0,0 +1,48 @@
+// min-llvm-version: 10.0.1
+// revisions: powerpc powerpc64 powerpc64le
+//[powerpc] compile-flags: --target powerpc-unknown-linux-gnu
+//[powerpc] needs-llvm-components: powerpc
+//[powerpc64] compile-flags: --target powerpc64-unknown-linux-gnu
+//[powerpc64] needs-llvm-components: powerpc
+//[powerpc64le] compile-flags: --target powerpc64le-unknown-linux-gnu
+//[powerpc64le] needs-llvm-components: powerpc
+
+#![crate_type = "rlib"]
+#![feature(no_core, rustc_attrs, lang_items)]
+#![no_core]
+
+#[lang = "sized"]
+trait Sized {}
+
+#[rustc_builtin_macro]
+macro_rules! asm {
+    () => {};
+}
+
+// CHECK-LABEL: @cr_clobber
+// CHECK: call void asm sideeffect "", "~{cr}"()
+#[no_mangle]
+pub unsafe fn cr_clobber() {
+    asm!("", out("cr") _, options(nostack, nomem));
+}
+
+// CHECK-LABEL: @cr0_clobber
+// CHECK: call void asm sideeffect "", "~{cr0}"()
+#[no_mangle]
+pub unsafe fn cr0_clobber() {
+    asm!("", out("cr0") _, options(nostack, nomem));
+}
+
+// CHECK-LABEL: @cr5_clobber
+// CHECK: call void asm sideeffect "", "~{cr5}"()
+#[no_mangle]
+pub unsafe fn cr5_clobber() {
+    asm!("", out("cr5") _, options(nostack, nomem));
+}
+
+// CHECK-LABEL: @xer_clobber
+// CHECK: call void asm sideeffect "", "~{xer}"()
+#[no_mangle]
+pub unsafe fn xer_clobber() {
+    asm!("", out("xer") _, options(nostack, nomem));
+}