From 70596a0fb2a2ec072e1e97e37616e05041dfa4e5 Mon Sep 17 00:00:00 2001 From: "Vladimir N. Makarov" Date: Fri, 2 Dec 2022 08:18:04 -0500 Subject: [PATCH] LRA: Check hard reg availability of pseudo and its subreg for pseudo reload Do not reload subreg pseudo if there are hard regs for subreg mode but there are no hard regs for pseudo mode. PR target/106462 gcc/ChangeLog: * lra-constraints.cc (curr_insn_transform): Check available hard regs for pseudo and its subreg to decide what to reload. gcc/testsuite/ChangeLog: * gcc.target/mips/pr106462.c: New test. --- gcc/lra-constraints.cc | 13 ++++++++++++- gcc/testsuite/gcc.target/mips/pr106462.c | 12 ++++++++++++ 2 files changed, 24 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/gcc.target/mips/pr106462.c diff --git a/gcc/lra-constraints.cc b/gcc/lra-constraints.cc index d92ab76908c8..02b5ab4a3169 100644 --- a/gcc/lra-constraints.cc +++ b/gcc/lra-constraints.cc @@ -4582,7 +4582,18 @@ curr_insn_transform (bool check_only_p) || (partial_subreg_p (mode, GET_MODE (reg)) && known_le (GET_MODE_SIZE (GET_MODE (reg)), UNITS_PER_WORD) - && WORD_REGISTER_OPERATIONS))) + && WORD_REGISTER_OPERATIONS)) + /* Avoid the situation when there are no available hard regs + for the pseudo mode but there are ones for the subreg + mode: */ + && !(goal_alt[i] != NO_REGS + && REGNO (reg) >= FIRST_PSEUDO_REGISTER + && (prohibited_class_reg_set_mode_p + (goal_alt[i], reg_class_contents[goal_alt[i]], + GET_MODE (reg))) + && !(prohibited_class_reg_set_mode_p + (goal_alt[i], reg_class_contents[goal_alt[i]], + mode)))) { /* An OP_INOUT is required when reloading a subreg of a mode wider than a word to ensure that data beyond the diff --git a/gcc/testsuite/gcc.target/mips/pr106462.c b/gcc/testsuite/gcc.target/mips/pr106462.c new file mode 100644 index 000000000000..c9105409524d --- /dev/null +++ b/gcc/testsuite/gcc.target/mips/pr106462.c @@ -0,0 +1,12 @@ +/* { dg-do compile } */ +/* { dg-options "-mabi=64 -msingle-float" } */ + +extern void bar (float x, short y); + +void foo (int argc) +{ + short c = argc * 2; + float a = (float)(short)c, b = 9.5; + + bar (b/a, c); +} -- 2.47.2