From 1a60aa7bc1e48150785402e0ae69276f78080d33 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Tue, 31 Oct 2006 19:42:44 +0000 Subject: [PATCH] handle "st" as "st(0)" git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31320 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/X86/X86ISelLowering.cpp | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 96ab93949d2..83bf2807333 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -32,6 +32,7 @@ #include "llvm/Support/MathExtras.h" #include "llvm/Target/TargetOptions.h" #include "llvm/Support/CommandLine.h" +#include "llvm/ADT/StringExtras.h" using namespace llvm; // FIXME: temporary. @@ -5532,9 +5533,17 @@ X86TargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint, // constraint into a member of a register class. std::pair Res; Res = TargetLowering::getRegForInlineAsmConstraint(Constraint, VT); - - // Not found? Bail out. - if (Res.second == 0) return Res; + + // Not found as a standard register? + if (Res.second == 0) { + // GCC calls "st(0)" just plain "st". + if (StringsEqualNoCase("{st}", Constraint)) { + Res.first = X86::ST0; + Res.second = X86::RSTRegisterClass; + } + + return Res; + } // Otherwise, check to see if this is a register class of the wrong value // type. For example, we want to map "{ax},i32" -> {eax}, we don't want it to