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100 lines
3.6 KiB
Diff
100 lines
3.6 KiB
Diff
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From c940aadecb4f623a39abe16b6c62b307e2b10638 Mon Sep 17 00:00:00 2001
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From: Richard Sandiford <richard.sandiford@arm.com>
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Date: Tue, 8 Aug 2023 01:57:26 +0100
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Subject: [PATCH 39/42] aarch64: Simplify probe of final frame allocation
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Previous patches ensured that the final frame allocation only needs
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a probe when the size is strictly greater than 1KiB. It's therefore
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safe to use the normal 1024 probe offset in all cases.
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The main motivation for doing this is to simplify the code and
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remove the number of special cases.
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gcc/
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* config/aarch64/aarch64.c (aarch64_allocate_and_probe_stack_space):
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Always probe the residual allocation at offset 1024, asserting
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that that is in range.
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gcc/testsuite/
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* gcc.target/aarch64/stack-check-prologue-17.c: Expect the probe
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to be at offset 1024 rather than offset 0.
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* gcc.target/aarch64/stack-check-prologue-18.c: Likewise.
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---
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gcc/config/aarch64/aarch64.c | 12 ++++--------
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.../gcc.target/aarch64/stack-check-prologue-17.c | 2 +-
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.../gcc.target/aarch64/stack-check-prologue-18.c | 4 ++--
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3 files changed, 7 insertions(+), 11 deletions(-)
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diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
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index 3d73c5f352f6..37c6219b07ab 100644
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--- a/gcc/config/aarch64/aarch64.c
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+++ b/gcc/config/aarch64/aarch64.c
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@@ -8153,16 +8153,12 @@ aarch64_allocate_and_probe_stack_space (rtx temp1, rtx temp2,
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are still safe. */
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if (residual)
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{
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- HOST_WIDE_INT residual_probe_offset = guard_used_by_caller;
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+ gcc_assert (guard_used_by_caller + byte_sp_alignment <= size);
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+
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/* If we're doing final adjustments, and we've done any full page
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allocations then any residual needs to be probed. */
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if (final_adjustment_p && rounded_size != 0)
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min_probe_threshold = 0;
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- /* If doing a small final adjustment, we always probe at offset 0.
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- This is done to avoid issues when the final adjustment is smaller
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- than the probing offset. */
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- else if (final_adjustment_p && rounded_size == 0)
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- residual_probe_offset = 0;
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aarch64_sub_sp (temp1, temp2, residual, frame_related_p);
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if (residual >= min_probe_threshold)
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@@ -8173,8 +8169,8 @@ aarch64_allocate_and_probe_stack_space (rtx temp1, rtx temp2,
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HOST_WIDE_INT_PRINT_DEC " bytes, probing will be required."
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"\n", residual);
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- emit_stack_probe (plus_constant (Pmode, stack_pointer_rtx,
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- residual_probe_offset));
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+ emit_stack_probe (plus_constant (Pmode, stack_pointer_rtx,
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+ guard_used_by_caller));
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emit_insn (gen_blockage ());
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}
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}
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diff --git a/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-17.c b/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-17.c
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index 0d8a25d73a24..f0ec1389771d 100644
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--- a/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-17.c
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+++ b/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-17.c
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@@ -33,7 +33,7 @@ int test1(int z) {
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** ...
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** str x30, \[sp\]
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** sub sp, sp, #1040
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-** str xzr, \[sp\]
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+** str xzr, \[sp, #?1024\]
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** cbnz w0, .*
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** bl g
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** ...
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diff --git a/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-18.c b/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-18.c
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index b646f040b54e..71d33ba34e9e 100644
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--- a/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-18.c
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+++ b/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-18.c
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@@ -10,7 +10,7 @@ void g();
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** str x30, \[sp\]
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** ...
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** sub sp, sp, #4064
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-** str xzr, \[sp\]
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+** str xzr, \[sp, #?1024\]
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** cbnz w0, .*
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** bl g
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** ...
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@@ -52,7 +52,7 @@ int test1(int z) {
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** str x30, \[sp\]
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** ...
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** sub sp, sp, #1040
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-** str xzr, \[sp\]
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+** str xzr, \[sp, #?1024\]
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** cbnz w0, .*
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** bl g
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** ...
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--
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2.42.0
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