https://github.com/knightXun created https://github.com/llvm/llvm-project/pull/75208
to align with GCC asm: "+f" is not allowed to be used on output register. fix issue: https://github.com/llvm/llvm-project/issues/75019 >From 38e6bcf970d62deb5c6fa2ba33ae817d39124c6a Mon Sep 17 00:00:00 2001 From: knightXun <badgangkil...@gmail.com> Date: Tue, 12 Dec 2023 23:57:56 +0800 Subject: [PATCH] [clang][sema] forbid '+f' on output register to align with GCC asm: "+f" is not allowed to be used on output register. fix issue: https://github.com/llvm/llvm-project/issues/75019 --- clang/lib/Basic/TargetInfo.cpp | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/clang/lib/Basic/TargetInfo.cpp b/clang/lib/Basic/TargetInfo.cpp index 6cd5d618a4aca..57a81e03bc484 100644 --- a/clang/lib/Basic/TargetInfo.cpp +++ b/clang/lib/Basic/TargetInfo.cpp @@ -717,8 +717,15 @@ bool TargetInfo::validateOutputConstraint(ConstraintInfo &Info) const { if (*Name != '=' && *Name != '+') return false; - if (*Name == '+') + if (*Name == '+') { Info.setIsReadWrite(); + // To align with GCC asm: "=f" is not allowed, the + // operand constraints must select a class with a single reg. + auto Flag = Name + 1; + if (Flag && *Flag == 'f') { + return false; + } + } Name++; while (*Name) { _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
