diff options
| author | Jakub Jelinek <jakub@redhat.com> | 2014-01-20 10:52:21 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2014-01-20 10:52:21 +0100 |
| commit | 0fabe5f34ff7f53f92f055aff02170ef6a305cac (patch) | |
| tree | 72ae1b0d8c429da9fb93082e460c754929b43049 /gcc/config | |
| parent | 6fc00404fa5037b61bd85d1825c2504e70d4992c (diff) | |
| download | gcc-0fabe5f34ff7f53f92f055aff02170ef6a305cac.zip gcc-0fabe5f34ff7f53f92f055aff02170ef6a305cac.tar.gz gcc-0fabe5f34ff7f53f92f055aff02170ef6a305cac.tar.bz2 | |
re PR target/59880 (ix86_avoid_lea_for_addr is buggy)
PR target/59880
* config/i386/i386.c (ix86_avoid_lea_for_addr): Return false
if operands[1] is a REG or ZERO_EXTEND of a REG.
* gcc.target/i386/pr59880.c: New test.
From-SVN: r206792
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); |