From 2d98f0664b06a9997819227bfd44c5c182aa6020 Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Sun, 31 May 2009 17:52:18 +0000 Subject: [PATCH] Fix a grammaro and clarify a comment. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72668 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/X86/X86Instr64bit.td | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/lib/Target/X86/X86Instr64bit.td b/lib/Target/X86/X86Instr64bit.td index 0babaa46f2d..dc15e4aa4ee 100644 --- a/lib/Target/X86/X86Instr64bit.td +++ b/lib/Target/X86/X86Instr64bit.td @@ -1588,11 +1588,11 @@ def : Pat<(i8 (trunc GR16:$src)), Requires<[In64BitMode]>; // h-register tricks. -// For now, be conservative and only the extract if the value is immediately -// zero-extended or stored, which are somewhat common cases. This uses a bunch -// of code to prevent a register requiring a REX prefix from being allocated in -// the same instruction as the h register, as there's currently no way to -// describe this requirement to the register allocator. +// For now, be conservative on x86-64 and use an h-register extract only if the +// value is immediately zero-extended or stored, which are somewhat common +// cases. This uses a bunch of code to prevent a register requiring a REX prefix +// from being allocated in the same instruction as the h register, as there's +// currently no way to describe this requirement to the register allocator. // h-register extract and zero-extend. def : Pat<(and (srl_su GR64:$src, (i8 8)), (i64 255)),