microblaze: Fix -Os right shift optimization is allowed into delay slot

alpsayin · alpsayin · commit 0e3007a4cf90 · 2024-10-18T18:05:53.000+01:00
In picolibc testing it's found that this produces code that compiler
squeezes into a single delay slot. And thus only the first instruction
emitted by this optimization is run and the rest is skipped.

Signed-off-by: Alp Sayin &lt;alpsayin@gmail.com&gt;
diff --git a/gcc/config/microblaze/microblaze.md b/gcc/config/microblaze/microblaze.md
@@ -2286,7 +2286,7 @@ else
     output_asm_insn ("bneid\t%3,.-4", operands);
     return "sra\t%0,%0";
   }
-  [(set_attr "type"    "arith")
+  [(set_attr "type"    "multi")
   (set_attr "mode"    "SI")
   (set_attr "length"  "20")]
 )

Original file line number	Diff line number	Diff line change
`@@ -2286,7 +2286,7 @@ else`
`2286`	`2286`	`output_asm_insn ("bneid\t%3,.-4", operands);`
`2287`	`2287`	`return "sra\t%0,%0";`
`2288`	`2288`	`}`
`2289`		`- [(set_attr "type" "arith")`
	`2289`	`+ [(set_attr "type" "multi")`
`2290`	`2290`	`(set_attr "mode" "SI")`
`2291`	`2291`	`(set_attr "length" "20")]`
`2292`	`2292`	`)`