* [PATCH, i386]: Avoid partial memory stalls for FP moves and related FP immediate cleanups
@ 2011-05-31 5:36 Uros Bizjak
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From: Uros Bizjak @ 2011-05-31 5:36 UTC (permalink / raw)
To: gcc-patches
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Hello!
Attached patch prevents partial memory stalls for XFmode and DFmode
(32bit) immediate->memory moves by penalizing memory target in case of
immediate move. The patch also cleans move splitters that handle
immediate operands (most notably, there are no FP subregs after the
reload pass; ix86_split_long_move splitters can be simplified and
merged into one pattern).
2011-05-30 Uros Bizjak <ubizjak@gmail.com>
* config/i386/i386.md (*movxf_internal): Penalize FYx*r->o alternative
to prevent partial memory stalls. Do not move CONST_DOUBLEs directly
to memory for !TARGET_MEMORY_MISMATCH_STALL.
(*movdf_internal_rex64): Do not penalize F->r alternative.
(*movdf_internal): Penalize FYd*r->o alternative to prevent partial
memory stalls. Generate SSE and x87 CONST_DOUBLE immediates only
when optimizing function for size. Do not move CONST_DOUBLEs
directly to memory for !TARGET_MEMORY_MISMATCH_STALL.
(FP move splitters): Merge {TF,XF,DF}mode move splitters. Do not
handle SUBREGs. Do not check for MEM_P operands in the insn condition,
check for ANY_FP_REGNO_P instead.
* config/i386/constraints.md (Yd): Enable GENERAL_REGS for
TARGET_64BIT and for TARGET_INTEGER_DFMODE_MOVES when optimizing
function for speed.
* config/i386/i386.c (ix86_option_override_internal): Do not
set TARGET_INTEGER_DFMODE_MOVES here.
Patch was bootstrapped and regression tested on x86_64-pc-linux-gnu
{,-m32}, committed to mainline SVN.
Uros.
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Index: i386.md
===================================================================
--- i386.md (revision 174435)
+++ i386.md (working copy)
@@ -2833,8 +2833,8 @@
"ix86_expand_move (<MODE>mode, operands); DONE;")
(define_insn "*movtf_internal"
- [(set (match_operand:TF 0 "nonimmediate_operand" "=x,m,x,?r,?o")
- (match_operand:TF 1 "general_operand" "xm,x,C,roF,Fr"))]
+ [(set (match_operand:TF 0 "nonimmediate_operand" "=x,m,x,?r ,?o")
+ (match_operand:TF 1 "general_operand" "xm,x,C,roF,Fr"))]
"TARGET_SSE2
&& !(MEM_P (operands[0]) && MEM_P (operands[1]))"
{
@@ -2877,24 +2877,19 @@
(const_string "TI"))]
(const_string "DI")))])
-(define_split
- [(set (match_operand:TF 0 "nonimmediate_operand" "")
- (match_operand:TF 1 "general_operand" ""))]
- "reload_completed
- && !(SSE_REG_P (operands[0]) || SSE_REG_P (operands[1]))"
- [(const_int 0)]
- "ix86_split_long_move (operands); DONE;")
-
+;; Possible store forwarding (partial memory) stall in alternative 4.
(define_insn "*movxf_internal"
- [(set (match_operand:XF 0 "nonimmediate_operand" "=f,m,f,Yx*r ,o")
+ [(set (match_operand:XF 0 "nonimmediate_operand" "=f,m,f,Yx*r ,!o")
(match_operand:XF 1 "general_operand" "fm,f,G,Yx*roF,FYx*r"))]
"!(MEM_P (operands[0]) && MEM_P (operands[1]))
&& (!can_create_pseudo_p ()
|| (ix86_cmodel == CM_MEDIUM || ix86_cmodel == CM_LARGE)
|| GET_CODE (operands[1]) != CONST_DOUBLE
|| (optimize_function_for_size_p (cfun)
- && standard_80387_constant_p (operands[1]) > 0)
- || memory_operand (operands[0], XFmode))"
+ && standard_80387_constant_p (operands[1]) > 0
+ && !memory_operand (operands[0], XFmode))
+ || (!TARGET_MEMORY_MISMATCH_STALL
+ && memory_operand (operands[0], XFmode)))"
{
switch (which_alternative)
{
@@ -2905,8 +2900,10 @@
case 2:
return standard_80387_constant_opcode (operands[1]);
- case 3: case 4:
+ case 3:
+ case 4:
return "#";
+
default:
gcc_unreachable ();
}
@@ -2914,25 +2911,11 @@
[(set_attr "type" "fmov,fmov,fmov,multi,multi")
(set_attr "mode" "XF,XF,XF,SI,SI")])
-(define_split
- [(set (match_operand:XF 0 "nonimmediate_operand" "")
- (match_operand:XF 1 "general_operand" ""))]
- "reload_completed
- && !(MEM_P (operands[0]) && MEM_P (operands[1]))
- && ! (FP_REG_P (operands[0]) ||
- (GET_CODE (operands[0]) == SUBREG
- && FP_REG_P (SUBREG_REG (operands[0]))))
- && ! (FP_REG_P (operands[1]) ||
- (GET_CODE (operands[1]) == SUBREG
- && FP_REG_P (SUBREG_REG (operands[1]))))"
- [(const_int 0)]
- "ix86_split_long_move (operands); DONE;")
-
(define_insn "*movdf_internal_rex64"
[(set (match_operand:DF 0 "nonimmediate_operand"
- "=f,m,f,r ,m,!r,!m,Y2*x,Y2*x,Y2*x,m ,Yi,r ")
+ "=f,m,f,r ,m,r,!m,Y2*x,Y2*x,Y2*x,m ,Yi,r ")
(match_operand:DF 1 "general_operand"
- "fm,f,G,rm,r,F ,F ,C ,Y2*x,m ,Y2*x,r ,Yi"))]
+ "fm,f,G,rm,r,F,F ,C ,Y2*x,m ,Y2*x,r ,Yi"))]
"TARGET_64BIT && !(MEM_P (operands[0]) && MEM_P (operands[1]))
&& (!can_create_pseudo_p ()
|| (ix86_cmodel == CM_MEDIUM || ix86_cmodel == CM_LARGE)
@@ -3080,21 +3063,20 @@
;; Possible store forwarding (partial memory) stall in alternative 4.
(define_insn "*movdf_internal"
[(set (match_operand:DF 0 "nonimmediate_operand"
- "=f,m,f,Yd*r ,o ,Y2*x,Y2*x,Y2*x,m ")
+ "=f,m,f,Yd*r ,!o ,Y2*x,Y2*x,Y2*x,m ")
(match_operand:DF 1 "general_operand"
"fm,f,G,Yd*roF,FYd*r,C ,Y2*x,m ,Y2*x"))]
"!TARGET_64BIT && !(MEM_P (operands[0]) && MEM_P (operands[1]))
&& (!can_create_pseudo_p ()
|| (ix86_cmodel == CM_MEDIUM || ix86_cmodel == CM_LARGE)
|| GET_CODE (operands[1]) != CONST_DOUBLE
- || (!TARGET_INTEGER_DFMODE_MOVES
+ || (optimize_function_for_size_p (cfun)
&& ((!(TARGET_SSE2 && TARGET_SSE_MATH)
&& standard_80387_constant_p (operands[1]) > 0)
|| (TARGET_SSE2 && TARGET_SSE_MATH
&& standard_sse_constant_p (operands[1])))
&& !memory_operand (operands[0], DFmode))
- || ((TARGET_INTEGER_DFMODE_MOVES
- || !TARGET_MEMORY_MISMATCH_STALL)
+ || (!TARGET_MEMORY_MISMATCH_STALL
&& memory_operand (operands[0], DFmode)))"
{
switch (which_alternative)
@@ -3215,20 +3197,6 @@
]
(const_string "DF")))])
-(define_split
- [(set (match_operand:DF 0 "nonimmediate_operand" "")
- (match_operand:DF 1 "general_operand" ""))]
- "reload_completed
- && !(MEM_P (operands[0]) && MEM_P (operands[1]))
- && ! (ANY_FP_REG_P (operands[0]) ||
- (GET_CODE (operands[0]) == SUBREG
- && ANY_FP_REG_P (SUBREG_REG (operands[0]))))
- && ! (ANY_FP_REG_P (operands[1]) ||
- (GET_CODE (operands[1]) == SUBREG
- && ANY_FP_REG_P (SUBREG_REG (operands[1]))))"
- [(const_int 0)]
- "ix86_split_long_move (operands); DONE;")
-
(define_insn "*movsf_internal"
[(set (match_operand:SF 0 "nonimmediate_operand"
"=f,m,f,r ,m ,x,x,x ,m,!*y,!m,!*y,?Yi,?r,!*Ym,!r")
@@ -3331,31 +3299,19 @@
[(set (match_operand 0 "register_operand" "")
(match_operand 1 "memory_operand" ""))]
"reload_completed
- && MEM_P (operands[1])
&& (GET_MODE (operands[0]) == TFmode
|| GET_MODE (operands[0]) == XFmode
|| GET_MODE (operands[0]) == DFmode
|| GET_MODE (operands[0]) == SFmode)
+ && ANY_FP_REGNO_P (REGNO (operands[0]))
&& (operands[2] = find_constant_src (insn))"
[(set (match_dup 0) (match_dup 2))]
{
rtx c = operands[2];
- rtx r = operands[0];
-
- if (GET_CODE (r) == SUBREG)
- r = SUBREG_REG (r);
+ int r = REGNO (operands[0]);
- if (SSE_REG_P (r))
- {
- if (!standard_sse_constant_p (c))
- FAIL;
- }
- else if (FP_REG_P (r))
- {
- if (standard_80387_constant_p (c) < 1)
- FAIL;
- }
- else if (MMX_REG_P (r))
+ if ((SSE_REGNO_P (r) && !standard_sse_constant_p (c))
+ || (FP_REGNO_P (r) && standard_80387_constant_p (c) < 1))
FAIL;
})
@@ -3363,31 +3319,18 @@
[(set (match_operand 0 "register_operand" "")
(float_extend (match_operand 1 "memory_operand" "")))]
"reload_completed
- && MEM_P (operands[1])
&& (GET_MODE (operands[0]) == TFmode
|| GET_MODE (operands[0]) == XFmode
- || GET_MODE (operands[0]) == DFmode
- || GET_MODE (operands[0]) == SFmode)
+ || GET_MODE (operands[0]) == DFmode)
+ && ANY_FP_REGNO_P (REGNO (operands[0]))
&& (operands[2] = find_constant_src (insn))"
[(set (match_dup 0) (match_dup 2))]
{
rtx c = operands[2];
- rtx r = operands[0];
-
- if (GET_CODE (r) == SUBREG)
- r = SUBREG_REG (r);
+ int r = REGNO (operands[0]);
- if (SSE_REG_P (r))
- {
- if (!standard_sse_constant_p (c))
- FAIL;
- }
- else if (FP_REG_P (r))
- {
- if (standard_80387_constant_p (c) < 1)
- FAIL;
- }
- else if (MMX_REG_P (r))
+ if ((SSE_REGNO_P (r) && !standard_sse_constant_p (c))
+ || (FP_REGNO_P (r) && standard_80387_constant_p (c) < 1))
FAIL;
})
@@ -3411,6 +3354,17 @@
operands[1] = CONST1_RTX (<MODE>mode);
})
+(define_split
+ [(set (match_operand 0 "nonimmediate_operand" "")
+ (match_operand 1 "general_operand" ""))]
+ "reload_completed
+ && (GET_MODE (operands[0]) == TFmode
+ || GET_MODE (operands[0]) == XFmode
+ || GET_MODE (operands[0]) == DFmode)
+ && !(ANY_FP_REG_P (operands[0]) || ANY_FP_REG_P (operands[1]))"
+ [(const_int 0)]
+ "ix86_split_long_move (operands); DONE;")
+
(define_insn "swapxf"
[(set (match_operand:XF 0 "register_operand" "+f")
(match_operand:XF 1 "register_operand" "+f"))
@@ -16650,7 +16604,7 @@
[(set (match_operand:SWI 0 "push_operand" "")
(match_operand:SWI 1 "memory_operand" ""))
(match_scratch:SWI 2 "<r>")]
- "optimize_insn_for_speed_p () && !TARGET_PUSH_MEMORY
+ "!(TARGET_PUSH_MEMORY || optimize_insn_for_size_p ())
&& !RTX_FRAME_RELATED_P (peep2_next_insn (0))"
[(set (match_dup 2) (match_dup 1))
(set (match_dup 0) (match_dup 2))])
@@ -16661,7 +16615,7 @@
[(set (match_operand:SF 0 "push_operand" "")
(match_operand:SF 1 "memory_operand" ""))
(match_scratch:SF 2 "r")]
- "optimize_insn_for_speed_p () && !TARGET_PUSH_MEMORY
+ "!(TARGET_PUSH_MEMORY || optimize_insn_for_size_p ())
&& !RTX_FRAME_RELATED_P (peep2_next_insn (0))"
[(set (match_dup 2) (match_dup 1))
(set (match_dup 0) (match_dup 2))])
@@ -16813,7 +16767,7 @@
[(match_dup 0)
(match_operand:SI 1 "memory_operand" "")]))
(clobber (reg:CC FLAGS_REG))])]
- "optimize_insn_for_speed_p () && ! TARGET_READ_MODIFY"
+ "!(TARGET_READ_MODIFY || optimize_insn_for_size_p ())"
[(set (match_dup 2) (match_dup 1))
(parallel [(set (match_dup 0)
(match_op_dup 3 [(match_dup 0) (match_dup 2)]))
@@ -16826,7 +16780,7 @@
[(match_operand:SI 1 "memory_operand" "")
(match_dup 0)]))
(clobber (reg:CC FLAGS_REG))])]
- "optimize_insn_for_speed_p () && ! TARGET_READ_MODIFY"
+ "!(TARGET_READ_MODIFY || optimize_insn_for_size_p ())"
[(set (match_dup 2) (match_dup 1))
(parallel [(set (match_dup 0)
(match_op_dup 3 [(match_dup 2) (match_dup 0)]))
@@ -16879,7 +16833,7 @@
[(match_dup 0)
(match_operand:SI 1 "nonmemory_operand" "")]))
(clobber (reg:CC FLAGS_REG))])]
- "optimize_insn_for_speed_p () && ! TARGET_READ_MODIFY_WRITE
+ "!(TARGET_READ_MODIFY_WRITE || optimize_insn_for_size_p ())
/* Do not split stack checking probes. */
&& GET_CODE (operands[3]) != IOR && operands[1] != const0_rtx"
[(set (match_dup 2) (match_dup 0))
@@ -16895,7 +16849,7 @@
[(match_operand:SI 1 "nonmemory_operand" "")
(match_dup 0)]))
(clobber (reg:CC FLAGS_REG))])]
- "optimize_insn_for_speed_p () && ! TARGET_READ_MODIFY_WRITE
+ "!(TARGET_READ_MODIFY_WRITE || optimize_insn_for_size_p ())
/* Do not split stack checking probes. */
&& GET_CODE (operands[3]) != IOR && operands[1] != const0_rtx"
[(set (match_dup 2) (match_dup 0))
Index: constraints.md
===================================================================
--- constraints.md (revision 174435)
+++ constraints.md (working copy)
@@ -108,7 +108,9 @@
"@internal Any MMX register, when inter-unit moves are enabled.")
(define_register_constraint "Yd"
- "TARGET_INTEGER_DFMODE_MOVES ? GENERAL_REGS : NO_REGS"
+ "(TARGET_64BIT
+ || (TARGET_INTEGER_DFMODE_MOVES && optimize_function_for_speed_p (cfun)))
+ ? GENERAL_REGS : NO_REGS"
"@internal Any integer register when integer DFmode moves are enabled.")
(define_register_constraint "Yx"
Index: i386.c
===================================================================
--- i386.c (revision 174435)
+++ i386.c (working copy)
@@ -3947,13 +3947,6 @@ ix86_option_override_internal (bool main
if (!TARGET_80387)
target_flags |= MASK_NO_FANCY_MATH_387;
- /* On 32bit targets, avoid moving DFmode values in
- integer registers when optimizing for size. */
- if (TARGET_64BIT)
- target_flags |= TARGET_INTEGER_DFMODE_MOVES;
- else if (optimize_size)
- target_flags &= ~TARGET_INTEGER_DFMODE_MOVES;
-
/* Turn on MMX builtins for -msse. */
if (TARGET_SSE)
{
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2011-05-31 5:36 [PATCH, i386]: Avoid partial memory stalls for FP moves and related FP immediate cleanups Uros Bizjak
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