From 3c979b06c041544b97b13c5adac1a91d6cde6582 Mon Sep 17 00:00:00 2001
From: Kevin Enderby <enderby@apple.com>
Date: Mon, 3 May 2010 20:45:05 +0000
Subject: [PATCH] Fixed the encoding of the x86 push instructions.  Using a
 32-bit immediate value caused the a pushl instruction to be incorrectly
 encoding using only two bytes of immediate, causing the following 2
 instruction bytes to be part of the 32-bit immediate value.  Also fixed the
 one byte form of push to be used when the immediate would fit in a signed
 extended byte.  Lastly changed the names to not include the 32 of PUSH32
 since they actually push the size of the stack pointer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102951 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86InstrInfo.td          |  8 ++++----
 test/MC/AsmParser/X86/x86_32-encoding.s | 13 +++++++++++++
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td
index befff27dd69..a2754eac215 100644
--- a/lib/Target/X86/X86InstrInfo.td
+++ b/lib/Target/X86/X86InstrInfo.td
@@ -753,11 +753,11 @@ def PUSH32rmm: I<0xFF, MRM6m, (outs), (ins i32mem:$src), "push{l}\t$src",[]>;
 }
 
 let Defs = [ESP], Uses = [ESP], neverHasSideEffects = 1, mayStore = 1 in {
-def PUSH32i8   : Ii8<0x6a, RawFrm, (outs), (ins i8imm:$imm), 
-                     "push{l}\t$imm", []>;
-def PUSH32i16  : Ii16<0x68, RawFrm, (outs), (ins i16imm:$imm), 
+def PUSHi8   : Ii8<0x6a, RawFrm, (outs), (ins i32i8imm:$imm), 
                       "push{l}\t$imm", []>;
-def PUSH32i32  : Ii32<0x68, RawFrm, (outs), (ins i32imm:$imm), 
+def PUSHi16  : Ii16<0x68, RawFrm, (outs), (ins i16imm:$imm), 
+                      "push{w}\t$imm", []>, OpSize;
+def PUSHi32  : Ii32<0x68, RawFrm, (outs), (ins i32imm:$imm), 
                       "push{l}\t$imm", []>;
 }
 
diff --git a/test/MC/AsmParser/X86/x86_32-encoding.s b/test/MC/AsmParser/X86/x86_32-encoding.s
index b5472ca49c4..475632cb78f 100644
--- a/test/MC/AsmParser/X86/x86_32-encoding.s
+++ b/test/MC/AsmParser/X86/x86_32-encoding.s
@@ -9984,3 +9984,16 @@ pshufb	CPI1_0(%rip), %xmm1
 // CHECK: bsrw	305419896, %bx
 // CHECK:  encoding: [0x66,0x0f,0xbd,0x1d,0x78,0x56,0x34,0x12]
           bsrw  305419896, %bx
+
+// radr://7901779
+// CHECK: pushl   $127
+// CHECK:  encoding: [0x6a,0xfe]
+          pushl   $127
+
+// CHECK: pushw   $254
+// CHECK:  encoding: [0x66,0x68,0xfe,0x00]
+          pushw   $254
+
+// CHECK: pushl   $254
+// CHECK:  encoding: [0x68,0xfe,0x00,0x00,0x00]
+          pushl   $254
-- 
2.34.1