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llvm-project/llvm/test/CodeGen/Mips/GlobalISel/llvm-ir
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Adrian Prantl c5d84d2eb3 GlobalISel/AArch64: don't optimize away redundant branches at -O0 
This patch prevents GlobalISel from optimizing out redundant branch
instructions when compiling without optimizations.

The motivating example is code like the following common pattern in
Swift, where users expect to be able to set a breakpoint on the early
exit:

public func f(b: Bool) {
  guard b else {
    return // I would like to set a breakpoint here.
  }
  ...
}

The patch modifies two places in GlobalISEL: The first one is in
IRTranslator.cpp where the removal of redundant branches is made
conditional on the optimization level. The second one is in
AArch64InstructionSelector.cpp where an -O0 *only* optimization is
being removed.

Disabling these optimizations increases code size at -O0 by
~8%. However, doing so improves debuggability, and debug builds are
the primary reason why developers compile without optimizations. We
thus concluded that this is the right trade-off.

rdar://79515454

This tenatively reapplies the patch without modifications, the LLDB
test that has blocked this from landing previously has since been
modified to hopefully no longer be sensitive to this change.

Differential Revision: https://reviews.llvm.org/D105238
 		2021-07-29 16:04:22 -07:00
..
add.ll GlobalISel: Use LLT in memory legality queries 2021-06-30 17:44:13 -04:00
add_vec.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
add_vec_builtin.ll
…
aggregate_struct_return.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
bitreverse.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
bitwise.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
branch.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
brindirect.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
bswap.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
call.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
ceil_and_floor.ll [MC][mips] Remove unused check prefixes. NFC 2020-11-13 14:31:13 +03:00
constants.ll
…
ctlz.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
ctpop.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
cttz.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
dyn_stackalloc.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
fabs.ll [MC][mips] Remove unused check prefixes. NFC 2020-11-13 14:31:13 +03:00
fabs_vec.ll
…
fabs_vec_builtin.ll
…
fcmp.ll [MC][mips] Remove unused check prefixes. NFC 2020-11-13 14:31:13 +03:00
fence.ll
…
float_args.ll Mips/GlobalISel: Use more standard call lowering infrastructure 2021-07-13 11:04:10 -04:00
float_arithmetic_operations.ll [MC][mips] Remove unused check prefixes. NFC 2020-11-13 14:31:13 +03:00
float_constants.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
floating_point_vec_arithmetic_operations.ll
…
floating_point_vec_arithmetic_operations_builtin.ll
…
fpext_and_fptrunc.ll [MC][mips] Remove unused check prefixes. NFC 2020-11-13 14:31:13 +03:00
fptosi_and_fptoui.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
fsqrt.ll [MC][mips] Remove unused check prefixes. NFC 2020-11-13 14:31:13 +03:00
fsqrt_vec.ll
…
fsqrt_vec_builtin.ll
…
global_address.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
global_address_pic.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
icmp.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
implicit_def.ll
…
inttoptr_and_ptrtoint.ll
…
jump_table_and_brjt.ll GlobalISel/AArch64: don't optimize away redundant branches at -O0 2021-07-29 16:04:22 -07:00
load.ll
…
load_4_unaligned.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
load_split_because_of_memsize_or_align.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
load_store_fold.ll
…
load_store_vec.ll
…
long_ambiguous_chain_s32.ll GlobalISel/AArch64: don't optimize away redundant branches at -O0 2021-07-29 16:04:22 -07:00
long_ambiguous_chain_s64.ll GlobalISel/AArch64: don't optimize away redundant branches at -O0 2021-07-29 16:04:22 -07:00
mul.ll GlobalISel: Use LLT in memory legality queries 2021-06-30 17:44:13 -04:00
mul_vec.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
mul_vec_builtin.ll
…
phi.ll GlobalISel/AArch64: don't optimize away redundant branches at -O0 2021-07-29 16:04:22 -07:00
pointers.ll
…
rem_and_div.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
rem_and_div_vec.ll
…
rem_and_div_vec_builtin.ll
…
ret.ll
…
select.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
sitofp_and_uitofp.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
sret_pointer.ll OpaquePtr: Bulk update tests to use typed sret 2020-11-20 17:58:26 -05:00
stack_args.ll
…
store.ll
…
store_4_unaligned.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
store_split_because_of_memsize_or_align.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
sub.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
sub_vec.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
sub_vec_builtin.ll
…
test_TypeInfoforMF.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
trap.ll
…
trunc.ll
…
truncStore_and_aExtLoad.ll GlobalISel: Use LLT in memory legality queries 2021-06-30 17:44:13 -04:00
var_arg.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
zextLoad_and_sextLoad.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00
zext_and_sext.ll Reapply "RegAllocFast: Rewrite and improve" 2020-09-30 10:35:25 -04:00