From a490e81d571b06e8bca5c2a9d74994740b63811b Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper@intel.com>
Date: Sat, 26 Aug 2017 06:24:25 +0000
Subject: [PATCH] [X86] Qualify the RMW INC/DEC patterns with NotSlowIncDec.

We were suppressing most uses of INC/DEC, but this one seems to have been missed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@311828 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86InstrArithmetic.td      | 4 ++--
 test/DebugInfo/COFF/register-variables.ll | 8 ++++----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/lib/Target/X86/X86InstrArithmetic.td b/lib/Target/X86/X86InstrArithmetic.td
index e38bbc9b3d3..2bf6351d045 100644
--- a/lib/Target/X86/X86InstrArithmetic.td
+++ b/lib/Target/X86/X86InstrArithmetic.td
@@ -481,7 +481,7 @@ def INC32r_alt : I<0x40, AddRegFrm, (outs GR32:$dst), (ins GR32:$src1),
 } // CodeSize = 1, hasSideEffects = 0
 } // Constraints = "$src1 = $dst", SchedRW
 
-let CodeSize = 2, SchedRW = [WriteALULd, WriteRMW] in {
+let CodeSize = 2, SchedRW = [WriteALULd, WriteRMW], Predicates = [NotSlowIncDec] in {
   def INC8m  : I<0xFE, MRM0m, (outs), (ins i8mem :$dst), "inc{b}\t$dst",
                [(store (add (loadi8 addr:$dst), 1), addr:$dst),
                 (implicit EFLAGS)], IIC_UNARY_MEM>;
@@ -528,7 +528,7 @@ def DEC32r_alt : I<0x48, AddRegFrm, (outs GR32:$dst), (ins GR32:$src1),
 } // Constraints = "$src1 = $dst", SchedRW
 
 
-let CodeSize = 2, SchedRW = [WriteALULd, WriteRMW] in {
+let CodeSize = 2, SchedRW = [WriteALULd, WriteRMW], Predicates = [NotSlowIncDec] in {
   def DEC8m  : I<0xFE, MRM1m, (outs), (ins i8mem :$dst), "dec{b}\t$dst",
                [(store (add (loadi8 addr:$dst), -1), addr:$dst),
                 (implicit EFLAGS)], IIC_UNARY_MEM>;
diff --git a/test/DebugInfo/COFF/register-variables.ll b/test/DebugInfo/COFF/register-variables.ll
index 02ddd42f616..a6fdcd66bf2 100644
--- a/test/DebugInfo/COFF/register-variables.ll
+++ b/test/DebugInfo/COFF/register-variables.ll
@@ -46,7 +46,7 @@
 ; ASM: [[after_inc_eax:\.Ltmp.*]]:
 ; ASM:         #DEBUG_VALUE: inlineinc:b <- %EAX
 ; ASM:         #DEBUG_VALUE: b <- %EAX
-; ASM:         incl    x(%rip)
+; ASM:         addl    $1, x(%rip)
 ; ASM: [[after_if:\.Ltmp.*]]:
 ; ASM: .LBB0_2:                                # %if.else
 ; ASM:         #DEBUG_VALUE: f:p <- %ESI
@@ -104,7 +104,7 @@
 ; OBJ:     LocalVariableAddrRange {
 ; OBJ:       OffsetStart: .text+0x7
 ; OBJ:       ISectStart: 0x0
-; OBJ:       Range: 0x19
+; OBJ:       Range: 0x1A
 ; OBJ:     }
 ; OBJ:   }
 ; OBJ:   LocalSym {
@@ -146,7 +146,7 @@
 ; OBJ:     MayHaveNoName: 0
 ; OBJ:       OffsetStart: .text+0x13
 ; OBJ:       ISectStart: 0x0
-; OBJ:       Range: 0x6
+; OBJ:       Range: 0x7
 ; OBJ:     }
 ; OBJ:   }
 ; OBJ:   InlineSiteSym {
@@ -180,7 +180,7 @@
 ; OBJ:     LocalVariableAddrRange {
 ; OBJ:       OffsetStart: .text+0x13
 ; OBJ:       ISectStart: 0x0
-; OBJ:       Range: 0x6
+; OBJ:       Range: 0x7
 ; OBJ:     }
 ; OBJ:   }
 ; OBJ:   InlineSiteEnd {
-- 
2.50.1