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306030f8aa
Stop using ST registers for function returns and inline-asm instructions and use FP registers instead. This allows removing a large amount of code in the stackifier pass that was needed to track register liveness and handle copies between ST and FP registers and function calls returning floating point values. It also fixes a bug which manifests when an ST register defined by an inline-asm instruction was live across another inline-asm instruction, as shown in the following sequence of machine instructions: 1. INLINEASM <es:frndint> $0:[regdef], %ST0<imp-def,tied5> 2. INLINEASM <es:fldcw $0> 3. %FP0<def> = COPY %ST0 <rdar://problem/16952634> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214580 91177308-0d34-0410-b5e6-96231b3b80d8
Low Level Virtual Machine (LLVM) ================================ This directory and its subdirectories contain source code for the Low Level Virtual Machine, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. Please see the documentation provided in docs/ for further assistance with LLVM, and in particular docs/GettingStarted.rst for getting started with LLVM and docs/README.txt for an overview of LLVM's documentation setup. If you're writing a package for LLVM, see docs/Packaging.rst for our suggestions.