[llvm] 54048ce - [SystemZ] Use llvm::bit_floor (NFC)

[Kazu Hirata via llvm-commits]

Author: Kazu Hirata
Date: 2023-01-28T15:04:16-08:00
New Revision: 54048ce86346fa612ab0dc3aceae111290ae6076

URL: https://github.com/llvm/llvm-project/commit/54048ce86346fa612ab0dc3aceae111290ae6076
DIFF: https://github.com/llvm/llvm-project/commit/54048ce86346fa612ab0dc3aceae111290ae6076.diff

LOG: [SystemZ] Use llvm::bit_floor (NFC)

Added: 
    

Modified: 
    llvm/lib/Target/SystemZ/SystemZISelLowering.cpp

Removed: 
    


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diff  --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
index c83c0d80fbc6..7ad52422a3c4 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -2535,8 +2535,7 @@ static unsigned getTestUnderMaskCond(unsigned BitSize, unsigned CCMask,
     return 0;
 
   // Work out the masks for the lowest and highest bits.
-  unsigned HighShift = 63 - llvm::countl_zero(Mask);
-  uint64_t High = uint64_t(1) << HighShift;
+  uint64_t High = llvm::bit_floor(Mask);
   uint64_t Low = uint64_t(1) << llvm::countr_zero(Mask);
 
   // Signed ordered comparisons are effectively unsigned if the sign