[ARM] Silence signed comparison warning. NFC

davemgreen · davemgreen · commit 2e54b4f9ea3f · 2025-03-31T13:59:58.000+01:00
After f4ec179, AbsImm is no longer signed and cannot be < 0.
diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -19696,7 +19696,7 @@ bool ARMTargetLowering::isLegalAddImmediate(int64_t Imm) const {
   if (Subtarget->isThumb2())
     return ARM_AM::getT2SOImmVal(AbsImm) != -1;
   // Thumb1 only has 8-bit unsigned immediate.
-  return AbsImm >= 0 && AbsImm <= 255;
+  return AbsImm <= 255;
 }
 
 // Return false to prevent folding

Original file line number	Diff line number	Diff line change
`@@ -19696,7 +19696,7 @@ bool ARMTargetLowering::isLegalAddImmediate(int64_t Imm) const {`
`19696`	`19696`	`if (Subtarget->isThumb2())`
`19697`	`19697`	`return ARM_AM::getT2SOImmVal(AbsImm) != -1;`
`19698`	`19698`	`// Thumb1 only has 8-bit unsigned immediate.`
`19699`		`- return AbsImm >= 0 && AbsImm <= 255;`
	`19699`	`+ return AbsImm <= 255;`
`19700`	`19700`	`}`
`19701`	`19701`
`19702`	`19702`	`// Return false to prevent folding`