Changes in directory llvm/lib/Target/ARM:
ARMISelLowering.cpp updated: 1.36 -> 1.37
---
Log message:
fix the CodeGen/ARM/2007-03-13-InstrSched.ll regression: allow IV's with scales
to be folded into non-store instructions.
---
Diffs of the changes: (+20 -4)
ARMISelLowering.cpp | 24 ++++++++++++++++++++----
1 files changed, 20 insertions(+), 4 deletions(-)
Index: llvm/lib/Target/ARM/ARMISelLowering.cpp
diff -u llvm/lib/Target/ARM/ARMISelLowering.cpp:1.36
llvm/lib/Target/ARM/ARMISelLowering.cpp:1.37
--- llvm/lib/Target/ARM/ARMISelLowering.cpp:1.36 Mon Apr 2 12:24:08 2007
+++ llvm/lib/Target/ARM/ARMISelLowering.cpp Mon Apr 2 13:51:18 2007
@@ -1332,6 +1332,15 @@
// r + r
if (((unsigned)AM.HasBaseReg + AM.Scale) <= 2)
return true;
+
+ case MVT::isVoid:
+ // Note, we allow "void" uses (basically, uses that aren't loads or
+ // stores), because arm allows folding a scale into many arithmetic
+ // operations. This should be made more precise and revisited later.
+
+ // Allow r << imm, but the imm has to be a multiple of two.
+ if (AM.Scale & 1) return false;
+ return isPowerOf2_32(AM.Scale);
}
break;
}
@@ -1413,12 +1422,19 @@
case MVT::i1:
case MVT::i8:
case MVT::i32:
- // r + r
- if (S == 2)
- return true;
- // r + r << imm
+ // Allow: r + r
+ // Allow: r << imm
+ // Allow: r + r << imm
S &= ~1;
return isPowerOf2_32(S);
+ case MVT::isVoid:
+ // Note, we allow "void" uses (basically, uses that aren't loads or
+ // stores), because arm allows folding a scale into many arithmetic
+ // operations. This should be made more precise and revisited later.
+
+ // Allow r << imm, but the imm has to be a multiple of two.
+ if (S & 1) return false;
+ return isPowerOf2_32(S);
}
}
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