Add support for the __sync_sub_and_fetch atomics and friends for X86. The code

was already present, but not hooked up to anything.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55018 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 0 deletions

diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td
index 37a5fed51c..7b5ee91e9b 100644
--- a/lib/Target/X86/X86InstrInfo.td
+++ b/lib/Target/X86/X86InstrInfo.td
@@ -2634,6 +2634,22 @@ def LXADD8  : I<0xC0, MRMSrcMem, (outs GR8:$dst), (ins i8mem:$ptr, GR8:$val),
                 TB, LOCK;
 }
 
+// Atomic exchange and subtract
+let Constraints = "$val = $dst", Defs = [EFLAGS] in {
+def LXSUB32 : I<0xC1, MRMSrcMem, (outs GR32:$dst), (ins i32mem:$ptr, GR32:$val),
+               "lock\n\txadd{l}\t{$val, $ptr|$ptr, $val}", 
+               [(set GR32:$dst, (atomic_load_sub_32 addr:$ptr, GR32:$val))]>,
+                TB, LOCK;
+def LXSUB16 : I<0xC1, MRMSrcMem, (outs GR16:$dst), (ins i16mem:$ptr, GR16:$val),
+               "lock\n\txadd{w}\t{$val, $ptr|$ptr, $val}", 
+               [(set GR16:$dst, (atomic_load_sub_16 addr:$ptr, GR16:$val))]>,
+                TB, OpSize, LOCK;
+def LXSUB8  : I<0xC0, MRMSrcMem, (outs GR8:$dst), (ins i8mem:$ptr, GR8:$val),
+               "lock\n\txadd{b}\t{$val, $ptr|$ptr, $val}", 
+               [(set GR8:$dst, (atomic_load_sub_8 addr:$ptr, GR8:$val))]>,
+                TB, LOCK;
+}
+
 // Atomic exchange, and, or, xor
 let Constraints = "$val = $dst", Defs = [EFLAGS],
                   usesCustomDAGSchedInserter = 1 in {