[clang] [AIX] recognize vsr in inline asm for AIX (PR #68476)

[Hubert Tong via cfe-commits]

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@@ -2,6 +2,10 @@
 
 // RUN: %clang_cc1 -triple powerpc64le-unknown-linux-gnu -target-feature +vsx \
 // RUN:   -target-cpu pwr9 -emit-llvm %s -o - | FileCheck %s
+// RUN: %clang_cc1 -triple powerpc64-ibm-aix -target-feature +vsx \
+// RUN:   -target-cpu pwr9 -emit-llvm %s -o - | FileCheck %s
+// RUN: %clang_cc1 -triple powerpc-ibm-aix -target-feature +vsx \
+// RUN:   -target-cpu pwr9 -emit-llvm %s -o - | FileCheck %s
 
 // This case is to test VSX register support in the clobbers list for inline asm.
 void testVSX (void) {
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hubert-reinterpretcast wrote:

The `%vs32` syntax is not accepted by the AIX system assembler. It seems to me that, as a front-end patch, this is not responsible for the recognition of the `%vs32` syntax in the assembly string, so perhaps (to have a more portable C test source) we should use plain `32` instead?

[aside: The IBM XL compilers accepted (without the percent sign and without usage checking; probably not in a documented manner) things like `r0`, etc. as alternatives to literal `0`, etc. in the assembly string.]

https://github.com/llvm/llvm-project/pull/68476