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| author | Richard Sandiford <richard.sandiford@arm.com> | 2023-09-12 16:05:11 +0100 |
|---|---|---|
| committer | Richard Sandiford <richard.sandiford@arm.com> | 2023-09-12 16:05:11 +0100 |
| commit | f87028a905059573ae7fdfe526d034fd70b3bcae (patch) | |
| tree | 060a68e7c9ca937ad4767cd32a12112177edd2e5 | |
| parent | fee0a18abfdd4874194abd149943fa7c77a29b7c (diff) | |
| download | gcc-f87028a905059573ae7fdfe526d034fd70b3bcae.zip gcc-f87028a905059573ae7fdfe526d034fd70b3bcae.tar.gz gcc-f87028a905059573ae7fdfe526d034fd70b3bcae.tar.bz2 | |
aarch64: Simplify probe of final frame allocation
Previous patches ensured that the final frame allocation only needs
a probe when the size is strictly greater than 1KiB. It's therefore
safe to use the normal 1024 probe offset in all cases.
The main motivation for doing this is to simplify the code and
remove the number of special cases.
gcc/
* config/aarch64/aarch64.cc (aarch64_allocate_and_probe_stack_space):
Always probe the residual allocation at offset 1024, asserting
that that is in range.
gcc/testsuite/
* gcc.target/aarch64/stack-check-prologue-17.c: Expect the probe
to be at offset 1024 rather than offset 0.
* gcc.target/aarch64/stack-check-prologue-18.c: Likewise.
* gcc.target/aarch64/stack-check-prologue-19.c: Likewise.
4 files changed, 9 insertions, 13 deletions
diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc index 383b32f..bcb879b 100644 --- a/gcc/config/aarch64/aarch64.cc +++ b/gcc/config/aarch64/aarch64.cc @@ -9887,16 +9887,12 @@ aarch64_allocate_and_probe_stack_space (rtx temp1, rtx temp2, are still safe. */ if (residual) { - HOST_WIDE_INT residual_probe_offset = guard_used_by_caller; + gcc_assert (guard_used_by_caller + byte_sp_alignment <= size); + /* If we're doing final adjustments, and we've done any full page allocations then any residual needs to be probed. */ if (final_adjustment_p && rounded_size != 0) min_probe_threshold = 0; - /* If doing a small final adjustment, we always probe at offset 0. - This is done to avoid issues when the final adjustment is smaller - than the probing offset. */ - else if (final_adjustment_p && rounded_size == 0) - residual_probe_offset = 0; aarch64_sub_sp (temp1, temp2, residual, frame_related_p); if (residual >= min_probe_threshold) @@ -9907,8 +9903,8 @@ aarch64_allocate_and_probe_stack_space (rtx temp1, rtx temp2, HOST_WIDE_INT_PRINT_DEC " bytes, probing will be required." "\n", residual); - emit_stack_probe (plus_constant (Pmode, stack_pointer_rtx, - residual_probe_offset)); + emit_stack_probe (plus_constant (Pmode, stack_pointer_rtx, + guard_used_by_caller)); emit_insn (gen_blockage ()); } } diff --git a/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-17.c b/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-17.c index 0d8a25d..f0ec138 100644 --- a/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-17.c +++ b/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-17.c @@ -33,7 +33,7 @@ int test1(int z) { ** ... ** str x30, \[sp\] ** sub sp, sp, #1040 -** str xzr, \[sp\] +** str xzr, \[sp, #?1024\] ** cbnz w0, .* ** bl g ** ... diff --git a/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-18.c b/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-18.c index 82447d2..6383bec 100644 --- a/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-18.c +++ b/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-18.c @@ -9,7 +9,7 @@ void g(); ** ... ** str x30, \[sp\] ** sub sp, sp, #4064 -** str xzr, \[sp\] +** str xzr, \[sp, #?1024\] ** cbnz w0, .* ** bl g ** ... @@ -50,7 +50,7 @@ int test1(int z) { ** ... ** str x30, \[sp\] ** sub sp, sp, #1040 -** str xzr, \[sp\] +** str xzr, \[sp, #?1024\] ** cbnz w0, .* ** bl g ** ... diff --git a/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-19.c b/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-19.c index 73ac3e4..562039b 100644 --- a/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-19.c +++ b/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-19.c @@ -9,7 +9,7 @@ void g(); ** ... ** str x30, \[sp\] ** sub sp, sp, #4064 -** str xzr, \[sp\] +** str xzr, \[sp, #?1024\] ** cbnz w0, .* ** bl g ** ... @@ -50,7 +50,7 @@ int test1(int z) { ** ... ** str x30, \[sp\] ** sub sp, sp, #1040 -** str xzr, \[sp\] +** str xzr, \[sp, #?1024\] ** cbnz w0, .* ** bl g ** ... |