MIPS64: Drop redundant sign-extensions in integer conversions
Test: mma test-art-target-run-test64 in QEMU
Change-Id: I1dc7923d89528964771ddca288c5016d729cfb05
diff --git a/compiler/optimizing/code_generator_mips64.cc b/compiler/optimizing/code_generator_mips64.cc
index cdbc712..1ae34d6 100644
--- a/compiler/optimizing/code_generator_mips64.cc
+++ b/compiler/optimizing/code_generator_mips64.cc
@@ -4160,9 +4160,12 @@
break;
case Primitive::kPrimInt:
case Primitive::kPrimLong:
- // Sign-extend 32-bit int into bits 32 through 63 for
- // int-to-long and long-to-int conversions
- __ Sll(dst, src, 0);
+ // Sign-extend 32-bit int into bits 32 through 63 for int-to-long and long-to-int
+ // conversions, except when the input and output registers are the same and we are not
+ // converting longs to shorter types. In these cases, do nothing.
+ if ((input_type == Primitive::kPrimLong) || (dst != src)) {
+ __ Sll(dst, src, 0);
+ }
break;
default:
