[UpdateTestChecks] Add --(no-)x86_scrub_sp option.

This makes it possible to use update_llc_test_checks to manage tests
that check for incorrect x86 stack offsets. It does not yet modify any
test to make use of this new option.

Author: hvdijk

llvm/utils/UpdateTestChecks/asm.py

@@ -177,8 +177,9 @@ def scrub_asm_x86(asm, args):
   # Detect stack spills and reloads and hide their exact offset and whether
   # they used the stack pointer or frame pointer.
   asm = SCRUB_X86_SPILL_RELOAD_RE.sub(r'{{[-0-9]+}}(%\1{{[sb]}}p)\2', asm)
-  # Generically match the stack offset of a memory operand.
-  asm = SCRUB_X86_SP_RE.sub(r'{{[0-9]+}}(%\1)', asm)
+  if getattr(args, 'x86_scrub_sp', True):
+    # Generically match the stack offset of a memory operand.
+    asm = SCRUB_X86_SP_RE.sub(r'{{[0-9]+}}(%\1)', asm)
   if getattr(args, 'x86_scrub_rip', False):
     # Generically match a RIP-relative memory operand.
     asm = SCRUB_X86_RIP_RE.sub(r'{{.*}}(%rip)', asm)

llvm/utils/update_llc_test_checks.py

@@ -27,9 +27,14 @@ def main():
   parser.add_argument(
       '--extra_scrub', action='store_true',
       help='Always use additional regex to further reduce diffs between various subtargets')
+  parser.add_argument(
+      '--x86_scrub_sp', action='store_true', default=True,
+      help='Use regex for x86 sp matching to reduce diffs between various subtargets')
+  parser.add_argument(
+      '--no_x86_scrub_sp', action='store_false', dest='x86_scrub_sp')
   parser.add_argument(
       '--x86_scrub_rip', action='store_true', default=True,
-      help='Use more regex for x86 matching to reduce diffs between various subtargets')
+      help='Use more regex for x86 rip matching to reduce diffs between various subtargets')
   parser.add_argument(
       '--no_x86_scrub_rip', action='store_false', dest='x86_scrub_rip')
   parser.add_argument(