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| author | Segher Boessenkool <segher@kernel.crashing.org> | 2017-06-09 05:46:08 +0200 |
|---|---|---|
| committer | Segher Boessenkool <segher@gcc.gnu.org> | 2017-06-09 05:46:08 +0200 |
| commit | 120ef1d50ab7fe53a67fb2026374b2bdd67838bd (patch) | |
| tree | 705e42d50783725696c7140aee6b70afcf3ba82c /gcc/testsuite | |
| parent | ff67045361eb84325e54c38c84cae2df9859bfd3 (diff) | |
| download | gcc-120ef1d50ab7fe53a67fb2026374b2bdd67838bd.zip gcc-120ef1d50ab7fe53a67fb2026374b2bdd67838bd.tar.gz gcc-120ef1d50ab7fe53a67fb2026374b2bdd67838bd.tar.bz2 | |
rs6000: Don't add an immediate to r0 (PR80966)
If there is a large stack frame the rs6000 -fstack-limit code would
calculate the new stack pointer value using two insns (an addis and
an addi), with r0 as temporary. Such instructions do not exist.
This patch changes add<mode>3 to expand using a different strategy in
such cases; to FAIL if there is no way to do it (namely, if the source
is r0 and there is no way to get a temporary reg); and it changes
rs6000_emit_allocate_stack to assert gen_add3_insn did in fact emit
instructions.
PR target/80966
* config/rs6000/rs6000.c (rs6000_emit_allocate_stack): Assert that
gen_add3_insn did not fail.
* config/rs6000/rs6000.md (add<mode>3): If asked to add a constant to
r0, construct that number in a temporary reg and add that reg to r0.
If asked to put the result in r0 as well, fail.
gcc/testsuite/
* gcc.target/powerpc/stack-limit.c: New testcase.
From-SVN: r249046
Diffstat (limited to 'gcc/testsuite')
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.target/powerpc/stack-limit.c | 10 |
2 files changed, 15 insertions, 0 deletions
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 7b0e74a..9855db5 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2017-06-09 Segher Boessenkool <segher@kernel.crashing.org> + + PR target/80966 + * gcc.target/powerpc/stack-limit.c: New testcase. + 2017-06-08 Will Schmidt <will_schmidt@vnet.ibm.com> * testsuite/gcc.target/powerpc/fold-vec-logical-eqv-char.c: New. diff --git a/gcc/testsuite/gcc.target/powerpc/stack-limit.c b/gcc/testsuite/gcc.target/powerpc/stack-limit.c new file mode 100644 index 0000000..e676c96 --- /dev/null +++ b/gcc/testsuite/gcc.target/powerpc/stack-limit.c @@ -0,0 +1,10 @@ +/* { dg-options "-O0 -fstack-limit-register=r14" } */ + +// PR80966 + +int foo (int i) +{ + char arr[135000]; + + arr[i] = 0; +} |