X87: [turbofan] Support subtraction displacements in BaseWithIndexAndDisplacementMatcher.

X87: [turbofan] Support subtraction displacements in BaseWithIndexAndDisplacementMatcher.

  port 574f6fe127fac2a22c4c909177bf0f3c30085bb0 (r37701)

  original commit message:
  Previously, the following schedule fragment:

   1: Parameter[0](0)
   2: Parameter[1](0)
   7: Int32Constant[1]
   8: Int32Sub(2, 7)
   9: Load[kRepTagged|kTypeAny](1, 8)

  would generate the following code (on ia32):

   mov eax,[ebp+0x8]
   mov ecx,[ebp+0xc]
   sub eax,0x1
   mov eax,[eax+ecx*1]

  Now it generates:

   mov eax,[ebp+0x8]
   mov ecx,[ebp+0xc]
   mov eax,[eax+ecx*1-1]

  Similar pattern matching also now works on x64.

BUG=

Committed: https://crrev.com/a71ebb88292403bc6c7d3866c5c9702f45278e4c
Cr-Commit-Position: refs/heads/master@{#37738}

[zhengxing.li, 2016-07-14 02:23:25]

zhengxing.li@intel.com changed reviewers:
+ chunyang.dai@intel.com, danno@chromium.org, weiliang.lin@intel.com

[zhengxing.li, 2016-07-14 02:23:25]

PTAL, thanks!

[Weiliang, 2016-07-14 02:31:19]

lgtm

[zhengxing.li, 2016-07-14 02:43:51]

The CQ bit was checked by zhengxing.li@intel.com

[commit-bot: I haz the power, 2016-07-14 02:44:02]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-14 03:06:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-14 03:06:47]

Description was changed from

==========
X87: [turbofan] Support subtraction displacements in
BaseWithIndexAndDisplacementMatcher.

  port 574f6fe127fac2a22c4c909177bf0f3c30085bb0 (r37701)

  original commit message:
  Previously, the following schedule fragment:

   1: Parameter[0](0)
   2: Parameter[1](0)
   7: Int32Constant[1]
   8: Int32Sub(2, 7)
   9: Load[kRepTagged|kTypeAny](1, 8)

  would generate the following code (on ia32):

   mov eax,[ebp+0x8]
   mov ecx,[ebp+0xc]
   sub eax,0x1
   mov eax,[eax+ecx*1]

  Now it generates:

   mov eax,[ebp+0x8]
   mov ecx,[ebp+0xc]
   mov eax,[eax+ecx*1-1]

  Similar pattern matching also now works on x64.

BUG=
==========

to

==========
X87: [turbofan] Support subtraction displacements in
BaseWithIndexAndDisplacementMatcher.

  port 574f6fe127fac2a22c4c909177bf0f3c30085bb0 (r37701)

  original commit message:
  Previously, the following schedule fragment:

   1: Parameter[0](0)
   2: Parameter[1](0)
   7: Int32Constant[1]
   8: Int32Sub(2, 7)
   9: Load[kRepTagged|kTypeAny](1, 8)

  would generate the following code (on ia32):

   mov eax,[ebp+0x8]
   mov ecx,[ebp+0xc]
   sub eax,0x1
   mov eax,[eax+ecx*1]

  Now it generates:

   mov eax,[ebp+0x8]
   mov ecx,[ebp+0xc]
   mov eax,[eax+ecx*1-1]

  Similar pattern matching also now works on x64.

BUG=

Committed: https://crrev.com/a71ebb88292403bc6c7d3866c5c9702f45278e4c
Cr-Commit-Position: refs/heads/master@{#37738}
==========

[commit-bot: I haz the power, 2016-07-14 03:06:48]

Patchset 1 (id:??) landed as
https://crrev.com/a71ebb88292403bc6c7d3866c5c9702f45278e4c
Cr-Commit-Position: refs/heads/master@{#37738}