From bdfbaa72c5b25f273a7e40be93eb13583d310911 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Sat, 29 Sep 2018 21:59:59 +0000 Subject: i386: Use TImode for BLKmode values in 2 integer registers When passing and returning BLKmode values in 2 integer registers, use 1 TImode register instead of 2 DImode registers. Otherwise, V1TImode may be used to move and store such BLKmode values, which prevent RTL optimizations. gcc/ PR target/87370 * config/i386/i386.c (construct_container): Use TImode for BLKmode values in 2 integer registers. gcc/testsuite/ PR target/87370 * gcc.target/i386/pr87370.c: New test. From-SVN: r264716 --- gcc/config/i386/i386.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) (limited to 'gcc/config/i386') diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 176cce5..5475251 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -7914,9 +7914,22 @@ construct_container (machine_mode mode, machine_mode orig_mode, if (n == 2 && regclass[0] == X86_64_INTEGER_CLASS && regclass[1] == X86_64_INTEGER_CLASS - && (mode == CDImode || mode == TImode) + && (mode == CDImode || mode == TImode || mode == BLKmode) && intreg[0] + 1 == intreg[1]) - return gen_rtx_REG (mode, intreg[0]); + { + if (mode == BLKmode) + { + /* Use TImode for BLKmode values in 2 integer registers. */ + exp[0] = gen_rtx_EXPR_LIST (VOIDmode, + gen_rtx_REG (TImode, intreg[0]), + GEN_INT (0)); + ret = gen_rtx_PARALLEL (mode, rtvec_alloc (1)); + XVECEXP (ret, 0, 0) = exp[0]; + return ret; + } + else + return gen_rtx_REG (mode, intreg[0]); + } /* Otherwise figure out the entries of the PARALLEL. */ for (i = 0; i < n; i++) -- cgit v1.1