[llvm] eee3db5 - [SystemZ] Change operand type for CKSM intrstruction. (#129572)

[via llvm-commits]

Author: Kai Nacke
Date: 2025-03-03T16:17:29-05:00
New Revision: eee3db5421040cfc3eae6e92ed714650a6f741fa

URL: https://github.com/llvm/llvm-project/commit/eee3db5421040cfc3eae6e92ed714650a6f741fa
DIFF: https://github.com/llvm/llvm-project/commit/eee3db5421040cfc3eae6e92ed714650a6f741fa.diff

LOG: [SystemZ] Change operand type for CKSM intrstruction. (#129572)

The current definition of the CKSM instruction uses GR64 for the first
operand. However, according to the Principles Of Operation the bits 0-31
of the first operand always remain unchanged. This PR changes the first
operand to GR32 to model this.
This has no further implication as this instruction is not used during
code generation.

Added: 
    

Modified: 
    llvm/lib/Target/SystemZ/SystemZInstrInfo.td

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Target/SystemZ/SystemZInstrInfo.td b/llvm/lib/Target/SystemZ/SystemZInstrInfo.td
index adfd0a19859c2..5b4a79395ca65 100644
--- a/llvm/lib/Target/SystemZ/SystemZInstrInfo.td
+++ b/llvm/lib/Target/SystemZ/SystemZInstrInfo.td
@@ -2183,7 +2183,7 @@ let mayLoad = 1, mayStore = 1, Defs = [CC, R0D, R1D, R2D, R3D, R5D],
 
 // Checksum.
 let mayLoad = 1, Defs = [CC] in
-  def CKSM : SideEffectBinaryMemMemRRE<"cksm", 0xB241, GR64, GR128>;
+  def CKSM : SideEffectBinaryMemMemRRE<"cksm", 0xB241, GR32, GR128>;
 
 // Compression call.
 let mayLoad = 1, mayStore = 1, Defs = [CC, R1D], Uses = [R0L, R1D] in