As-applied. From: https://gcc.gnu.org/ml/gcc-patches/2014-10/msg02605.html Linked from bug62231 comment 4 there --- gcc/config/rs6000/rs6000.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/gcc/config/rs6000/rs6000.c +++ b/gcc/config/rs6000/rs6000.c @@ -1707,7 +1707,7 @@ SCmode so as to pass the value correctly in a pair of registers. */ else if (TARGET_E500_DOUBLE && FLOAT_MODE_P (mode) && mode != SCmode - && !DECIMAL_FLOAT_MODE_P (mode)) + && !DECIMAL_FLOAT_MODE_P (mode) && SPE_SIMD_REGNO_P (regno)) reg_size = UNITS_PER_FP_WORD; else