From b105b997a49c809bfd464ae7691d5ee45d34f446 Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Fri, 16 Sep 2011 18:32:30 +0000
Subject: [PATCH] Thumb2 assembly parsing and encoding for SSAT.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139926 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMInstrThumb2.td        | 11 +++++++++--
 test/MC/ARM/basic-thumb2-instructions.s | 16 ++++++++++++++++
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/lib/Target/ARM/ARMInstrThumb2.td b/lib/Target/ARM/ARMInstrThumb2.td
index 21e70fa83e6..1d86a2a80b8 100644
--- a/lib/Target/ARM/ARMInstrThumb2.td
+++ b/lib/Target/ARM/ARMInstrThumb2.td
@@ -2019,7 +2019,7 @@ def t2SSAT16: T2SatI<
 }
 
 def t2USAT: T2SatI<
-                (outs rGPR:$Rd), (ins i32imm:$sat_imm, rGPR:$Rn, shift_imm:$sh),
+               (outs rGPR:$Rd), (ins imm0_31:$sat_imm, rGPR:$Rn, shift_imm:$sh),
                 NoItinerary, "usat", "\t$Rd, $sat_imm, $Rn$sh",
                 [/* For disassembly only; pattern left blank */]> {
   let Inst{31-27} = 0b11110;
@@ -2028,7 +2028,7 @@ def t2USAT: T2SatI<
   let Inst{15} = 0;
 }
 
-def t2USAT16: T2SatI<(outs rGPR:$Rd), (ins i32imm:$sat_imm, rGPR:$Rn),
+def t2USAT16: T2SatI<(outs rGPR:$Rd), (ins imm0_15:$sat_imm, rGPR:$Rn),
                      NoItinerary,
                      "usat16", "\t$Rd, $sat_imm, $Rn",
                      [/* For disassembly only; pattern left blank */]>,
@@ -3854,3 +3854,10 @@ def : t2InstAlias<"rsb${s}${p} $Rdn, $Rm",
 def : t2InstAlias<"rsb${s}${p} $Rdn, $ShiftedRm",
            (t2RSBrs rGPR:$Rdn, rGPR:$Rdn, t2_so_reg:$ShiftedRm, pred:$p,
                     cc_out:$s)>;
+
+// SSAT/USAT optional shift operand.
+def : t2InstAlias<"ssat${p} $Rd, $sat_imm, $Rn",
+                  (t2SSAT rGPR:$Rd, imm1_32:$sat_imm, rGPR:$Rn, 0, pred:$p)>;
+def : t2InstAlias<"usat${p} $Rd, $sat_imm, $Rn",
+                  (t2USAT rGPR:$Rd, imm0_31:$sat_imm, rGPR:$Rn, 0, pred:$p)>;
+
diff --git a/test/MC/ARM/basic-thumb2-instructions.s b/test/MC/ARM/basic-thumb2-instructions.s
index e5441aea794..3b25feb899e 100644
--- a/test/MC/ARM/basic-thumb2-instructions.s
+++ b/test/MC/ARM/basic-thumb2-instructions.s
@@ -2048,6 +2048,22 @@ _func:
 @ CHECK: srsia	sp!, #5                 @ encoding: [0xad,0xe9,0x05,0xc0]
 
 
+@------------------------------------------------------------------------------
+@ SSAT
+@------------------------------------------------------------------------------
+        ssat	r8, #1, r10
+        ssat	r8, #1, r10, lsl #0
+        ssat	r8, #1, r10, lsl #31
+        ssat	r8, #1, r10, asr #32
+        ssat	r8, #1, r10, asr #1
+
+@ CHECK: ssat	r8, #1, r10             @ encoding: [0x0a,0xf3,0x00,0x08]
+@ CHECK: ssat	r8, #1, r10             @ encoding: [0x0a,0xf3,0x00,0x08]
+@ CHECK: ssat	r8, #1, r10, lsl #31    @ encoding: [0x0a,0xf3,0xc0,0x78]
+@ CHECK: ssat	r8, #1, r10, asr #32    @ encoding: [0x2a,0xf3,0x00,0x08]
+@ CHECK: ssat	r8, #1, r10, asr #1     @ encoding: [0x2a,0xf3,0x40,0x08]
+
+
 @------------------------------------------------------------------------------
 @ SUB (register)
 @------------------------------------------------------------------------------