diff options
| -rw-r--r-- | gcc/testsuite/gcc.c-torture/compile/inline-asm-1.c | 14 | ||||
| -rw-r--r-- | gcc/tree-ssa-dce.cc | 7 |
2 files changed, 21 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.c-torture/compile/inline-asm-1.c b/gcc/testsuite/gcc.c-torture/compile/inline-asm-1.c new file mode 100644 index 00000000000..0044cb761b6 --- /dev/null +++ b/gcc/testsuite/gcc.c-torture/compile/inline-asm-1.c @@ -0,0 +1,14 @@ +/* PR tree-opt/106087, + simple_dce_from_worklist would delete the + inline-asm when it was still being referenced + by the other ssa name. */ + +static int t; + +int f(void) +{ + int tt, tt1; + asm("":"=r"(tt), "=r"(tt1)); + t = tt1; + return tt; +} diff --git a/gcc/tree-ssa-dce.cc b/gcc/tree-ssa-dce.cc index 2067b711d5b..4b7b664867d 100644 --- a/gcc/tree-ssa-dce.cc +++ b/gcc/tree-ssa-dce.cc @@ -2060,6 +2060,13 @@ simple_dce_from_worklist (bitmap worklist) if (gimple_has_side_effects (t)) continue; + /* The defining statement needs to be defining only this name. + ASM is the only statement that can define more than one + (non-virtual) name. */ + if (is_a<gasm *>(t) + && !single_ssa_def_operand (t, SSA_OP_DEF)) + continue; + /* Don't remove statements that are needed for non-call eh to work. */ if (stmt_unremovable_because_of_non_call_eh_p (cfun, t)) |