catch constants more often

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30534 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/Alpha/AlphaInstrInfo.td b/lib/Target/Alpha/AlphaInstrInfo.td
index be0d497f7e24a11e888e9498339a6c365c7fef4a..ceac0562d1b6ed266149f0308bbb2afdd7f6e9b9 100644 (file)
--- a/lib/Target/Alpha/AlphaInstrInfo.td
+++ b/lib/Target/Alpha/AlphaInstrInfo.td
@@ -214,6 +214,20 @@ def : Pat<(select GPRC:$which, GPRC:$src1, GPRC:$src2),
 def : Pat<(select GPRC:$which, GPRC:$src1, immUExt8:$src2),
       (CMOVEQi GPRC:$src1, immUExt8:$src2, GPRC:$which)>;
 
+//Invert sense when we can for constants:
+def : Pat<(select (seteq GPRC:$RCOND, 0), immUExt8:$RFALSE, GPRC:$RTRUE),
+          (CMOVEQi GPRC:$RTRUE, immUExt8:$RFALSE, GPRC:$RCOND)>;
+def : Pat<(select (setne GPRC:$RCOND, 0), immUExt8:$RFALSE, GPRC:$RTRUE),
+          (CMOVNEi GPRC:$RTRUE, immUExt8:$RFALSE, GPRC:$RCOND)>;
+def : Pat<(select (setgt GPRC:$RCOND, 0), immUExt8:$RFALSE, GPRC:$RTRUE),
+          (CMOVGTi GPRC:$RTRUE, immUExt8:$RFALSE, GPRC:$RCOND)>;
+def : Pat<(select (setge GPRC:$RCOND, 0), immUExt8:$RFALSE, GPRC:$RTRUE),
+          (CMOVGEi GPRC:$RTRUE, immUExt8:$RFALSE, GPRC:$RCOND)>;
+def : Pat<(select (setlt GPRC:$RCOND, 0), immUExt8:$RFALSE, GPRC:$RTRUE),
+          (CMOVLTi GPRC:$RTRUE, immUExt8:$RFALSE, GPRC:$RCOND)>;
+def : Pat<(select (setle GPRC:$RCOND, 0), immUExt8:$RFALSE, GPRC:$RTRUE),
+          (CMOVLEi GPRC:$RTRUE, immUExt8:$RFALSE, GPRC:$RCOND)>;
+
 
 def ADDL     : OForm< 0x10, 0x00, "addl $RA,$RB,$RC",
                       [(set GPRC:$RC, (intop (add GPRC:$RA, GPRC:$RB)))], s_iadd>;

diff --git a/lib/Target/Alpha/README.txt b/lib/Target/Alpha/README.txt
index ed5424726a7c8fb459bbae342fd7d9a6e9d6cb71..2d1909a42c57e60fdffe74ed85aeb2d3d9694e70 100644 (file)
--- a/lib/Target/Alpha/README.txt
+++ b/lib/Target/Alpha/README.txt
@@ -1,19 +1,3 @@
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-Fix cmovs with a constant on the wrong side
-
-aka:
-        lda $0,10($31)
-        cmovlt $17,$0,$16
-
-is bad for:
-
-long %cmov_lt2(long %a, long %c) {
-entry:
-       %tmp.1 = setlt long %c, 0
-       %retval = select bool %tmp.1, long 10, long %a
-       ret long %retval
-}
-
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 Fix Ordered/Unordered FP stuff