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| author | H.J. Lu <hjl.tools@gmail.com> | 2021-08-02 10:01:46 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2021-08-02 10:38:18 -0700 |
| commit | 7f4c3943f795fda33df648d2196b678bada1ba81 (patch) | |
| tree | 0ef563ff75d073560f77fac7a91f5ed094db3479 | |
| parent | 1bee034e012d1146d34b0d767fe28a485c210e4b (diff) | |
| download | gcc-7f4c3943f795fda33df648d2196b678bada1ba81.zip gcc-7f4c3943f795fda33df648d2196b678bada1ba81.tar.gz gcc-7f4c3943f795fda33df648d2196b678bada1ba81.tar.bz2 | |
x86: Avoid stack realignment when copying data
To avoid stack realignment, use SCRATCH_SSE_REG to copy data from one
memory location to another.
gcc/
* config/i386/i386-expand.c (ix86_expand_vector_move): Call
ix86_gen_scratch_sse_rtx to get a scratch SSE register to copy
data from one memory location to another.
gcc/testsuite/
* gcc.target/i386/eh_return-1.c: New test.
| -rw-r--r-- | gcc/config/i386/i386-expand.c | 4 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.target/i386/eh_return-1.c | 26 |
2 files changed, 29 insertions, 1 deletions
diff --git a/gcc/config/i386/i386-expand.c b/gcc/config/i386/i386-expand.c index 896bd68..1d469bf 100644 --- a/gcc/config/i386/i386-expand.c +++ b/gcc/config/i386/i386-expand.c @@ -625,7 +625,9 @@ ix86_expand_vector_move (machine_mode mode, rtx operands[]) && !register_operand (op0, mode) && !register_operand (op1, mode)) { - emit_move_insn (op0, force_reg (GET_MODE (op0), op1)); + rtx tmp = ix86_gen_scratch_sse_rtx (GET_MODE (op0)); + emit_move_insn (tmp, op1); + emit_move_insn (op0, tmp); return; } diff --git a/gcc/testsuite/gcc.target/i386/eh_return-1.c b/gcc/testsuite/gcc.target/i386/eh_return-1.c new file mode 100644 index 0000000..671ba63 --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/eh_return-1.c @@ -0,0 +1,26 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -march=haswell -mno-avx512f" } */ + +struct _Unwind_Context +{ + void *ra; + char array[48]; +}; + +extern long uw_install_context_1 (struct _Unwind_Context *); + +void +_Unwind_RaiseException (void) +{ + struct _Unwind_Context this_context, cur_context; + long offset = uw_install_context_1 (&this_context); + __builtin_memcpy (&this_context, &cur_context, + sizeof (struct _Unwind_Context)); + void *handler = __builtin_frob_return_addr ((&cur_context)->ra); + uw_install_context_1 (&cur_context); + __builtin_eh_return (offset, handler); +} + +/* { dg-final { scan-assembler-times "vmovdqu\[ \\t\]+\[^\n\]*%ymm" 4 } } */ +/* No need to dynamically realign the stack here. */ +/* { dg-final { scan-assembler-not "and\[^\n\r]*%\[re\]sp" } } */ |