From: Florian Krohm <florian@eich-krohm.de>
Date: Sat, 26 May 2012 01:59:21 +0000 (+0000)
Subject: Take advantage of compare immediate insns as more than half
X-Git-Tag: svn/VALGRIND_3_8_1^2~126
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2d3132304f25844fd05703afe7dbfc34fd2a3677;p=thirdparty%2Fvalgrind.git

Take advantage of compare immediate insns as more than half
of all comparisons are like that.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2352
---

diff --git a/VEX/priv/host_s390_defs.c b/VEX/priv/host_s390_defs.c
index 4e21deba2c..f60beea74e 100644
--- a/VEX/priv/host_s390_defs.c
+++ b/VEX/priv/host_s390_defs.c
@@ -1523,6 +1523,18 @@ s390_emit_CFI(UChar *p, UChar r1, UInt i2)
 }
 
 
+static UChar *
+s390_emit_CGFI(UChar *p, UChar r1, UInt i2)
+{
+   vassert(s390_host_has_eimm);
+
+   if (UNLIKELY(vex_traceflags & VEX_TRACE_ASM))
+      s390_disasm(ENC3(MNM, GPR, INT), "cgfi", r1, i2);
+
+   return emit_RIL(p, 0xc20c00000000ULL, r1, i2);
+}
+
+
 static UChar *
 s390_emit_CS(UChar *p, UChar r1, UChar r3, UChar b2, UShort d2)
 {
@@ -1623,6 +1635,18 @@ s390_emit_CLFI(UChar *p, UChar r1, UInt i2)
 }
 
 
+static UChar *
+s390_emit_CLGFI(UChar *p, UChar r1, UInt i2)
+{
+   vassert(s390_host_has_eimm);
+
+   if (UNLIKELY(vex_traceflags & VEX_TRACE_ASM))
+      s390_disasm(ENC3(MNM, GPR, UINT), "clgfi", r1, i2);
+
+   return emit_RIL(p, 0xc20e00000000ULL, r1, i2);
+}
+
+
 static UChar *
 s390_emit_DR(UChar *p, UChar r1, UChar r2)
 {
@@ -6309,6 +6333,15 @@ s390_insn_compare_emit(UChar *buf, const s390_insn *insn)
             return s390_emit_CLFIw(buf, r1, value);
 
       case 8:
+         if (s390_host_has_eimm) {
+            if (signed_comparison) {
+               if (ulong_fits_signed_32bit(value))
+                  return s390_emit_CGFI(buf, r1, value);
+            } else {
+               if (ulong_fits_unsigned_32bit(value))
+                  return s390_emit_CLGFI(buf, r1, value);
+            }
+         }
          buf = s390_emit_load_64imm(buf, R0, value);
          if (signed_comparison)
             return s390_emit_CGR(buf, r1, R0);