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* [gcc r12-2665] x86: Avoid stack realignment when copying data
@ 2021-08-02 17:41 H.J. Lu
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From: H.J. Lu @ 2021-08-02 17:41 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:7f4c3943f795fda33df648d2196b678bada1ba81
commit r12-2665-g7f4c3943f795fda33df648d2196b678bada1ba81
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Aug 2 10:01:46 2021 -0700
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.
Diff:
---
gcc/config/i386/i386-expand.c | 4 +++-
gcc/testsuite/gcc.target/i386/eh_return-1.c | 26 ++++++++++++++++++++++++++
2 files changed, 29 insertions(+), 1 deletion(-)
diff --git a/gcc/config/i386/i386-expand.c b/gcc/config/i386/i386-expand.c
index 896bd685b1f..1d469bf7221 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 00000000000..671ba635e88
--- /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" } } */
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