diff options
Diffstat (limited to 'gcc/config')
-rw-r--r-- | gcc/config/i386/i386.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index ff210c8..9991c30 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -18159,8 +18159,19 @@ ix86_avoid_lea_for_addr (rtx insn, rtx operands[]) if (!TARGET_AVOID_LEA_FOR_ADDR || optimize_function_for_size_p (cfun)) return false; + /* The "at least two components" test below might not catch simple + *mov[sd]i_internal or *zero_extendsidi2 insns if parts.base is + non-NULL and parts.disp is const0_rtx as the only components in + the address, e.g. if the register is %rbp or %r13. As this + test is much cheaper and moves or zero extensions are the common + case, do this check first. */ + if (REG_P (operands[1]) + || (GET_CODE (operands[1]) == ZERO_EXTEND + && REG_P (XEXP (operands[1], 0)))) + return false; + /* Check it is correct to split here. */ - if (!ix86_ok_to_clobber_flags(insn)) + if (!ix86_ok_to_clobber_flags (insn)) return false; ok = ix86_decompose_address (operands[1], &parts); |