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| author | Kyrylo Tkachov <kyrylo.tkachov@arm.com> | 2015-12-16 15:49:42 +0000 |
|---|---|---|
| committer | Kyrylo Tkachov <ktkachov@gcc.gnu.org> | 2015-12-16 15:49:42 +0000 |
| commit | 283b6c85430d825db1a0cfbd4f54a41d66721e31 (patch) | |
| tree | a22a8a0307a6b40dea66cb671b888c5e439eb57f /gcc/config/aarch64 | |
| parent | 077067a5f30559fd97ffbf2d9f8f636442d8905a (diff) | |
| download | gcc-283b6c85430d825db1a0cfbd4f54a41d66721e31.tar.gz | |
[AArch64] Properly cost zero_extend+ashift forms of ubfi[xz]
* config/aarch64/aarch64.c (aarch64_extend_bitfield_pattern_p):
New function.
(aarch64_rtx_costs, ZERO_EXTEND, SIGN_EXTEND cases): Use the above
to handle extend+shift rtxes.
From-SVN: r231698
Diffstat (limited to 'gcc/config/aarch64')
| -rw-r--r-- | gcc/config/aarch64/aarch64.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index 1e1b864d865..e3e5b6b2d10 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -6146,6 +6146,50 @@ aarch64_if_then_else_costs (rtx op0, rtx op1, rtx op2, int *cost, bool speed) return false; } +/* Check whether X is a bitfield operation of the form shift + extend that + maps down to a UBFIZ/SBFIZ/UBFX/SBFX instruction. If so, return the + operand to which the bitfield operation is applied. Otherwise return + NULL_RTX. */ + +static rtx +aarch64_extend_bitfield_pattern_p (rtx x) +{ + rtx_code outer_code = GET_CODE (x); + machine_mode outer_mode = GET_MODE (x); + + if (outer_code != ZERO_EXTEND && outer_code != SIGN_EXTEND + && outer_mode != SImode && outer_mode != DImode) + return NULL_RTX; + + rtx inner = XEXP (x, 0); + rtx_code inner_code = GET_CODE (inner); + machine_mode inner_mode = GET_MODE (inner); + rtx op = NULL_RTX; + + switch (inner_code) + { + case ASHIFT: + if (CONST_INT_P (XEXP (inner, 1)) + && (inner_mode == QImode || inner_mode == HImode)) + op = XEXP (inner, 0); + break; + case LSHIFTRT: + if (outer_code == ZERO_EXTEND && CONST_INT_P (XEXP (inner, 1)) + && (inner_mode == QImode || inner_mode == HImode)) + op = XEXP (inner, 0); + break; + case ASHIFTRT: + if (outer_code == SIGN_EXTEND && CONST_INT_P (XEXP (inner, 1)) + && (inner_mode == QImode || inner_mode == HImode)) + op = XEXP (inner, 0); + break; + default: + break; + } + + return op; +} + /* Calculate the cost of calculating X, storing it in *COST. Result is true if the total cost of the operation has now been calculated. */ static bool @@ -6837,6 +6881,15 @@ cost_plus: return true; } + op0 = aarch64_extend_bitfield_pattern_p (x); + if (op0) + { + *cost += rtx_cost (op0, mode, ZERO_EXTEND, 0, speed); + if (speed) + *cost += extra_cost->alu.bfx; + return true; + } + if (speed) { if (VECTOR_MODE_P (mode)) @@ -6868,6 +6921,15 @@ cost_plus: return true; } + op0 = aarch64_extend_bitfield_pattern_p (x); + if (op0) + { + *cost += rtx_cost (op0, mode, SIGN_EXTEND, 0, speed); + if (speed) + *cost += extra_cost->alu.bfx; + return true; + } + if (speed) { if (VECTOR_MODE_P (mode)) |