From 7be7a07d27b88ef733255714b0ae5187cf18a428 Mon Sep 17 00:00:00 2001 From: Jim Wilson Date: Wed, 21 Oct 1998 19:27:19 +0000 Subject: Fix sparc builtin_memcpy miscompilation. * expmed.c (store_bit_field): If need to add a SUBREG, then remove existing SUBREG if we can, otherwise abort. From-SVN: r23215 --- gcc/expmed.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'gcc/expmed.c') diff --git a/gcc/expmed.c b/gcc/expmed.c index 1c9fcf5..2836c4c 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -423,7 +423,18 @@ store_bit_field (str_rtx, bitsize, bitnum, fieldmode, value, align, total_size) || GET_MODE_SIZE (GET_MODE (op0)) > UNITS_PER_WORD) { if (GET_CODE (op0) != REG) - op0 = copy_to_reg (op0); + { + /* Since this is a destination (lvalue), we can't copy it to a + pseudo. We can trivially remove a SUBREG that does not + change the size of the operand. Such a SUBREG may have been + added above. Otherwise, abort. */ + if (GET_CODE (op0) == SUBREG + && (GET_MODE_SIZE (GET_MODE (op0)) + == GET_MODE_SIZE (GET_MODE (SUBREG_REG (op0))))) + op0 = SUBREG_REG (op0); + else + abort (); + } op0 = gen_rtx_SUBREG (mode_for_size (BITS_PER_WORD, MODE_INT, 0), op0, offset); } -- cgit v1.1