diff options
| author | H.J. Lu <hongjiu.lu@intel.com> | 2018-09-29 21:59:59 +0000 |
|---|---|---|
| committer | H.J. Lu <hjl@gcc.gnu.org> | 2018-09-29 14:59:59 -0700 |
| commit | bdfbaa72c5b25f273a7e40be93eb13583d310911 (patch) | |
| tree | ea061bd7f0306e9f4ad21b1b0c130d68ff0226bf /gcc/config/i386 | |
| parent | 29a94bf97da148775cedb260ca8581be9cc2bacd (diff) | |
| download | gcc-bdfbaa72c5b25f273a7e40be93eb13583d310911.zip gcc-bdfbaa72c5b25f273a7e40be93eb13583d310911.tar.gz gcc-bdfbaa72c5b25f273a7e40be93eb13583d310911.tar.bz2 | |
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
Diffstat (limited to 'gcc/config/i386')
| -rw-r--r-- | gcc/config/i386/i386.c | 17 |
1 files changed, 15 insertions, 2 deletions
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++) |