From 055d20742642a7392d5931b61f2ea09c60c204dd Mon Sep 17 00:00:00 2001
From: Bill Schmidt <wschmidt@linux.vnet.ibm.com>
Date: Mon, 26 Aug 2013 19:42:51 +0000
Subject: [PowerPC] More fast-isel chunks (returns and integer extends)

Incremental improvement to fast-isel for PPC64.  This allows us to
select on ret, sext, and zext.  Filling in sext/zext improves some of
the existing logic in handling compare-immediates that needed extends.

A simplified return convention for fast-isel is also added to the
PPC64 calling conventions.  All call/return processing for DAG
selection is handled with custom code, so there isn't an existing CC
to rely on here.  The include of PPCGenCallingConv.inc causes compiler
warnings due to the 32-bit calling conventions that are not used, so
the dummy function "usePPC32CCs()" is added here to silence those.

Test cases for the return and extend logic are added.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189266 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/PowerPC/PPCInstr64Bit.td | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'lib/Target/PowerPC/PPCInstr64Bit.td')

diff --git a/lib/Target/PowerPC/PPCInstr64Bit.td b/lib/Target/PowerPC/PPCInstr64Bit.td
index f78bb3873e..92579040b6 100644
--- a/lib/Target/PowerPC/PPCInstr64Bit.td
+++ b/lib/Target/PowerPC/PPCInstr64Bit.td
@@ -506,6 +506,14 @@ defm EXTSH8 : XForm_11r<31, 922, (outs g8rc:$rA), (ins g8rc:$rS),
                         [(set i64:$rA, (sext_inreg i64:$rS, i16))]>;
 } // Interpretation64Bit
 
+// For fast-isel:
+let isCodeGenOnly = 1 in {
+def EXTSB8_32_64 : XForm_11<31, 954, (outs g8rc:$rA), (ins gprc:$rS),
+                           "extsb $rA, $rS", IntSimple, []>, isPPC64;
+def EXTSH8_32_64 : XForm_11<31, 922, (outs g8rc:$rA), (ins gprc:$rS),
+                           "extsh $rA, $rS", IntSimple, []>, isPPC64;
+} // isCodeGenOnly for fast-isel
+
 defm EXTSW  : XForm_11r<31, 986, (outs g8rc:$rA), (ins g8rc:$rS),
                         "extsw", "$rA, $rS", IntSimple,
                         [(set i64:$rA, (sext_inreg i64:$rS, i32))]>, isPPC64;
@@ -569,6 +577,14 @@ defm RLDICL : MDForm_1r<30, 0,
                         (outs g8rc:$rA), (ins g8rc:$rS, u6imm:$SH, u6imm:$MBE),
                         "rldicl", "$rA, $rS, $SH, $MBE", IntRotateDI,
                         []>, isPPC64;
+// For fast-isel:
+let isCodeGenOnly = 1 in
+def RLDICL_32_64 : MDForm_1<30, 0,
+                           (outs g8rc:$rA),
+                           (ins gprc:$rS, u6imm:$SH, u6imm:$MBE),
+                           "rldicl $rA, $rS, $SH, $MBE", IntRotateDI,
+                           []>, isPPC64;
+// End fast-isel.
 defm RLDICR : MDForm_1r<30, 1,
                         (outs g8rc:$rA), (ins g8rc:$rS, u6imm:$SH, u6imm:$MBE),
                         "rldicr", "$rA, $rS, $SH, $MBE", IntRotateDI,
-- 
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