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| author | Marc Glisse <marc.glisse@inria.fr> | 2012-10-01 11:53:26 +0200 |
|---|---|---|
| committer | Marc Glisse <glisse@gcc.gnu.org> | 2012-10-01 09:53:26 +0000 |
| commit | 5f6e1c559b08a262977b1cbcfe16f75116fef4f7 (patch) | |
| tree | 323d8a354041efc900f2e813aecb6d428aa1da25 /gcc/simplify-rtx.c | |
| parent | 3c321286b46e0819f24f2b6749da8687685e8b8b (diff) | |
| download | gcc-5f6e1c559b08a262977b1cbcfe16f75116fef4f7.zip gcc-5f6e1c559b08a262977b1cbcfe16f75116fef4f7.tar.gz gcc-5f6e1c559b08a262977b1cbcfe16f75116fef4f7.tar.bz2 | |
simplify-rtx.c (simplify_binary_operation_1): Detect the identity.
2012-10-01 Marc Glisse <marc.glisse@inria.fr>
gcc/
* simplify-rtx.c (simplify_binary_operation_1) <VEC_SELECT>:
Detect the identity.
<VEC_CONCAT>: Handle VEC_SELECTs from the same vector.
gcc/testsuite/
* gcc.target/i386/vect-rebuild.c: New testcase.
From-SVN: r191909
Diffstat (limited to 'gcc/simplify-rtx.c')
| -rw-r--r-- | gcc/simplify-rtx.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index af85ccc..aebe6bb 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -3246,6 +3246,23 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode, return gen_rtx_CONST_VECTOR (mode, v); } + /* Recognize the identity. */ + if (GET_MODE (trueop0) == mode) + { + bool maybe_ident = true; + for (int i = 0; i < XVECLEN (trueop1, 0); i++) + { + rtx j = XVECEXP (trueop1, 0, i); + if (!CONST_INT_P (j) || INTVAL (j) != i) + { + maybe_ident = false; + break; + } + } + if (maybe_ident) + return trueop0; + } + /* If we build {a,b} then permute it, build the result directly. */ if (XVECLEN (trueop1, 0) == 2 && CONST_INT_P (XVECEXP (trueop1, 0, 0)) @@ -3371,6 +3388,24 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode, return gen_rtx_CONST_VECTOR (mode, v); } + + /* Try to merge VEC_SELECTs from the same vector into a single one. */ + if (GET_CODE (trueop0) == VEC_SELECT + && GET_CODE (trueop1) == VEC_SELECT + && rtx_equal_p (XEXP (trueop0, 0), XEXP (trueop1, 0))) + { + rtx par0 = XEXP (trueop0, 1); + rtx par1 = XEXP (trueop1, 1); + int len0 = XVECLEN (par0, 0); + int len1 = XVECLEN (par1, 0); + rtvec vec = rtvec_alloc (len0 + len1); + for (int i = 0; i < len0; i++) + RTVEC_ELT (vec, i) = XVECEXP (par0, 0, i); + for (int i = 0; i < len1; i++) + RTVEC_ELT (vec, len0 + i) = XVECEXP (par1, 0, i); + return simplify_gen_binary (VEC_SELECT, mode, XEXP (trueop0, 0), + gen_rtx_PARALLEL (VOIDmode, vec)); + } } return 0; |