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| author | H.J. Lu <hjl.tools@gmail.com> | 2021-08-04 06:15:04 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2021-08-04 12:51:12 -0700 |
| commit | 09dba016db937e61be21ef1e9581065a9ed2847d (patch) | |
| tree | a8ea2ca5fba5e4f336b0ecce83c42256917a005d | |
| parent | 361da782a25031c6ae3967bf8c10a8119845255c (diff) | |
| download | gcc-09dba016db937e61be21ef1e9581065a9ed2847d.zip gcc-09dba016db937e61be21ef1e9581065a9ed2847d.tar.gz gcc-09dba016db937e61be21ef1e9581065a9ed2847d.tar.bz2 | |
x86: Avoid stack realignment when copying data with SSE register
To avoid stack realignment, call ix86_gen_scratch_sse_rtx to get a
scratch SSE register to copy data with with SSE register from one
memory location to another.
gcc/
PR target/101772
* config/i386/i386-expand.c (ix86_expand_vector_move): Call
ix86_gen_scratch_sse_rtx to get a scratch SSE register to copy
data with SSE register from one memory location to another.
gcc/testsuite/
PR target/101772
* gcc.target/i386/eh_return-2.c: New test.
| -rw-r--r-- | gcc/config/i386/i386-expand.c | 6 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.target/i386/eh_return-2.c | 16 |
2 files changed, 21 insertions, 1 deletions
diff --git a/gcc/config/i386/i386-expand.c b/gcc/config/i386/i386-expand.c index 1d469bf..bd21efa 100644 --- a/gcc/config/i386/i386-expand.c +++ b/gcc/config/i386/i386-expand.c @@ -613,7 +613,11 @@ ix86_expand_vector_move (machine_mode mode, rtx operands[]) arguments in memory. */ if (!register_operand (op0, mode) && !register_operand (op1, mode)) - op1 = force_reg (mode, op1); + { + rtx scratch = ix86_gen_scratch_sse_rtx (mode); + emit_move_insn (scratch, op1); + op1 = scratch; + } tmp[0] = op0; tmp[1] = op1; ix86_expand_vector_move_misalign (mode, tmp); diff --git a/gcc/testsuite/gcc.target/i386/eh_return-2.c b/gcc/testsuite/gcc.target/i386/eh_return-2.c new file mode 100644 index 0000000..f23f449 --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/eh_return-2.c @@ -0,0 +1,16 @@ +/* PR target/101772 */ +/* { dg-do compile } */ +/* { dg-additional-options "-O0 -march=x86-64 -mstackrealign" } */ + +struct _Unwind_Context _Unwind_Resume_or_Rethrow_this_context; + +void offset (int); + +struct _Unwind_Context { + void *reg[7]; +} _Unwind_Resume_or_Rethrow() { + struct _Unwind_Context cur_contextcur_context = + _Unwind_Resume_or_Rethrow_this_context; + offset(0); + __builtin_eh_return ((long) offset, 0); +} |