Patchwork [RFA/ARM] Fix PR54974: Thumb literal pools don't handle PC rounding

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Submitter Matthew Gretton-Dann
Date Nov. 29, 2012, 2:42 p.m.
Message ID <CADSXKXqrKyBmFO-Gi4nrFiPNdsGCZPCEiWyFQDYsP6H-r1sq4w@mail.gmail.com>
Download mbox | patch
Permalink /patch/202760/
State New
Headers show

Comments

Matthew Gretton-Dann - Nov. 29, 2012, 2:42 p.m.
On 24 November 2012 00:27, Ramana Radhakrishnan
<ramana.gcc@googlemail.com> wrote:
> On Wed, Nov 21, 2012 at 7:59 PM, Matthew Gretton-Dann
> <matthew.gretton-dann@linaro.org> wrote:
[snip]
>> The fix is to decrease the pool_range of all insns by 2 when generating
>> Thumb code.  There is no need to change neg_pool_range values as rounding
>> down here will reduce the distance of the literal pool.
>
> A comment about this fact around thumb2_pool_range would be appropriate.
>
[snip]
>>
>> Tested arm-none-linux-gnueabi cross, and with the testcase attached to the
>> PR.  No added testcase in the patch as this code is sensitive to other code
>> generation and so it is not easy to generate a testcase which will reliably
>> test this condition.
>>
>> OK for trunk, 4.7, and 4.6?
>
>
> Ok for trunk today - please wait a few days before backporting into
> 4.6 and 4.7 to see what the fallout is like . Watch out for any
> fallout with the auto-testers.

The attached is what was actually committed as revision 193930
(original patch + requested comment).

Thanks,

Matt

--
Matthew Gretton-Dann
Linaro Toolchain Working Group
matthew.gretton-dann@linaro.org

Patch

Index: gcc/ChangeLog
===================================================================
--- gcc/ChangeLog	(revision 193929)
+++ gcc/ChangeLog	(revision 193930)
@@ -1,3 +1,33 @@ 
+2012-11-29  Matthew Gretton-Dann  <matthew.gretton-dann@linaro.org>
+
+	PR target/54974
+	* config/arm/arm.md (thumb2_pool_range, pool_range): Add comment on
+	Thumb pool ranges.
+	(thumb1_extendhisi2): Reduce Thumb pool range.
+	(arm_movdi): Likewise.
+	(thumb1_movdi_insn): Likewise.
+	(thumb1_movsi_insn): Likewise.
+	(pic_load_addr_unified): Likewise.
+	(pic_load_addr_32bit): Likewise.
+	(pic_load_addr_thumb1): Likewise.
+	(thumb1_movhf): Likewise.
+	(arm_movsf_soft_insn): Likewise.
+	(thumb1_movsf_soft_insn): Likewise.
+	(movdf_soft_insn): Likewise.
+	(thumb1_movdf_soft_insn): Likewise.
+	* config/arm/neon.md (*neon_mov<mode>): Likewise.
+	(*neon_mov<mode>): Likwise.
+	* config/arm/thumb2.md: (*thumb2_movsi_insn): Likewise.
+	(*thumb2_movhi_insn): Likewise.
+	(*thumb2_extendqisi_v6): Likewise.
+	(*thumb2_zero_extendqisi_v6): Likewise.
+	(*thumb2_zero_extendqisi2_v6): Likewise.
+	* config/arm/vfp.md: (*thumb2_movsi_vfp): Likewise.
+	(*movdi_vfp): Likewise.
+	(*movdi_vfp_cortexa8): Likewise.
+	(*thumb2_movsf_vfp): Likewise.
+	(*thumb2_movdf_vfp): Likewise.
+
 2012-11-29  Kai Tietz  <ktietz@redhat.com>
 
 	PR target/55171
Index: gcc/config/arm/thumb2.md
===================================================================
--- gcc/config/arm/thumb2.md	(revision 193929)
+++ gcc/config/arm/thumb2.md	(revision 193930)
@@ -182,7 +182,7 @@ 
    str%?\\t%1, %0"
   [(set_attr "type" "*,*,*,*,load1,load1,store1,store1")
    (set_attr "predicable" "yes")
-   (set_attr "pool_range" "*,*,*,*,1020,4096,*,*")
+   (set_attr "pool_range" "*,*,*,*,1018,4094,*,*")
    (set_attr "neg_pool_range" "*,*,*,*,0,0,*,*")]
 )
 
@@ -217,7 +217,7 @@ 
    ldr%(h%)\\t%0, %1\\t%@ movhi"
   [(set_attr "type" "*,*,store1,load1")
    (set_attr "predicable" "yes")
-   (set_attr "pool_range" "*,*,*,4096")
+   (set_attr "pool_range" "*,*,*,4094")
    (set_attr "neg_pool_range" "*,*,*,250")]
 )
 
@@ -570,7 +570,7 @@ 
    ldr%(sb%)\\t%0, %1"
   [(set_attr "type" "alu_shift,load_byte")
    (set_attr "predicable" "yes")
-   (set_attr "pool_range" "*,4096")
+   (set_attr "pool_range" "*,4094")
    (set_attr "neg_pool_range" "*,250")]
 )
 
@@ -583,7 +583,7 @@ 
    ldr%(h%)\\t%0, %1"
   [(set_attr "type" "alu_shift,load_byte")
    (set_attr "predicable" "yes")
-   (set_attr "pool_range" "*,4096")
+   (set_attr "pool_range" "*,4094")
    (set_attr "neg_pool_range" "*,250")]
 )
 
@@ -596,7 +596,7 @@ 
    ldr%(b%)\\t%0, %1\\t%@ zero_extendqisi2"
   [(set_attr "type" "alu_shift,load_byte")
    (set_attr "predicable" "yes")
-   (set_attr "pool_range" "*,4096")
+   (set_attr "pool_range" "*,4094")
    (set_attr "neg_pool_range" "*,250")]
 )
 
Index: gcc/config/arm/vfp.md
===================================================================
--- gcc/config/arm/vfp.md	(revision 193929)
+++ gcc/config/arm/vfp.md	(revision 193930)
@@ -123,7 +123,7 @@ 
    (set_attr "type" "*,*,*,*,load1,load1,store1,store1,r_2_f,f_2_r,fcpys,f_loads,f_stores")
    (set_attr "neon_type" "*,*,*,*,*,*,*,*,neon_mcr,neon_mrc,neon_vmov,*,*")
    (set_attr "insn" "mov,mov,mvn,mov,*,*,*,*,*,*,*,*,*")
-   (set_attr "pool_range"     "*,*,*,*,1020,4096,*,*,*,*,*,1020,*")
+   (set_attr "pool_range"     "*,*,*,*,1018,4094,*,*,*,*,*,1018,*")
    (set_attr "neg_pool_range" "*,*,*,*,   0,   0,*,*,*,*,*,1008,*")]
 )
 
@@ -176,7 +176,8 @@ 
                                  (const_int 8)
                                  (const_int 4))]
                               (const_int 4)))
-   (set_attr "pool_range"     "*,*,*,*,1020,4096,*,*,*,*,1020,*")
+   (set_attr "arm_pool_range"     "*,*,*,*,1020,4096,*,*,*,*,1020,*")
+   (set_attr "thumb2_pool_range"     "*,*,*,*,1018,4094,*,*,*,*,1018,*")
    (set_attr "neg_pool_range" "*,*,*,*,1004,0,*,*,*,*,1004,*")
    (set_attr "arch"           "t2,any,any,any,a,t2,any,any,any,any,any,any")]
 )
@@ -224,7 +225,8 @@ 
                                  * 4")]
                               (const_int 4)))
    (set_attr "predicable"    "yes")
-   (set_attr "pool_range"     "*,*,*,*,1020,4096,*,*,*,*,1020,*")
+   (set_attr "arm_pool_range"     "*,*,*,*,1018,4094,*,*,*,*,1018,*")
+   (set_attr "thumb2_pool_range"     "*,*,*,*,1018,4094,*,*,*,*,1018,*")
    (set_attr "neg_pool_range" "*,*,*,*,1004,0,*,*,*,*,1004,*")
    (set (attr "ce_count") 
 	(symbol_ref "get_attr_length (insn) / 4"))
@@ -413,7 +415,7 @@ 
      "r_2_f,f_2_r,fconsts,f_loads,f_stores,load1,store1,fcpys,*")
    (set_attr "neon_type" "neon_mcr,neon_mrc,*,*,*,*,*,neon_vmov,*")
    (set_attr "insn" "*,*,*,*,*,*,*,*,mov")
-   (set_attr "pool_range" "*,*,*,1020,*,4092,*,*,*")
+   (set_attr "pool_range" "*,*,*,1018,*,4090,*,*,*")
    (set_attr "neg_pool_range" "*,*,*,1008,*,0,*,*,*")]
 )
 
@@ -509,7 +511,7 @@ 
 				 (const_int 8)
 				 (const_int 4))]
 			      (const_int 4)))
-   (set_attr "pool_range" "*,*,*,1020,*,4096,*,*,*")
+   (set_attr "pool_range" "*,*,*,1018,*,4094,*,*,*")
    (set_attr "neg_pool_range" "*,*,*,1008,*,0,*,*,*")]
 )
 
Index: gcc/config/arm/neon.md
===================================================================
--- gcc/config/arm/neon.md	(revision 193929)
+++ gcc/config/arm/neon.md	(revision 193930)
@@ -196,7 +196,8 @@ 
   (set_attr "type" "*,f_stored,*,f_loadd,*,*,alu,load2,store2")
   (set_attr "insn" "*,*,*,*,*,*,mov,*,*")
   (set_attr "length" "4,4,4,4,4,4,8,8,8")
-  (set_attr "pool_range"     "*,*,*,1020,*,*,*,1020,*")
+  (set_attr "arm_pool_range"     "*,*,*,1020,*,*,*,1020,*")
+  (set_attr "thumb2_pool_range"     "*,*,*,1018,*,*,*,1018,*")
   (set_attr "neg_pool_range" "*,*,*,1004,*,*,*,1004,*")])
 
 (define_insn "*neon_mov<mode>"
@@ -241,7 +242,8 @@ 
    (set_attr "type" "*,*,*,*,*,*,alu,load4,store4")
    (set_attr "insn" "*,*,*,*,*,*,mov,*,*")
    (set_attr "length" "4,8,4,8,8,8,16,8,16")
-   (set_attr "pool_range" "*,*,*,1020,*,*,*,1020,*")
+   (set_attr "arm_pool_range" "*,*,*,1020,*,*,*,1020,*")
+   (set_attr "thumb2_pool_range" "*,*,*,1018,*,*,*,1018,*")
    (set_attr "neg_pool_range" "*,*,*,996,*,*,*,996,*")])
 
 (define_expand "movti"
Index: gcc/config/arm/arm.md
===================================================================
--- gcc/config/arm/arm.md	(revision 193929)
+++ gcc/config/arm/arm.md	(revision 193930)
@@ -297,6 +297,9 @@ 
 ; POOL_RANGE is how far away from a constant pool entry that this insn
 ; can be placed.  If the distance is zero, then this insn will never
 ; reference the pool.
+; Note that for Thumb constant pools the PC value is rounded down to the
+; nearest multiple of four.  Therefore, THUMB2_POOL_RANGE (and POOL_RANGE for
+; Thumb insns) should be set to <max_range> - 2.
 ; NEG_POOL_RANGE is nonzero for insns that can reference a constant pool entry
 ; before its address.  It is set to <max_range> - (8 + <data_size>).
 (define_attr "arm_pool_range" "" (const_int 0))
@@ -4966,7 +4969,7 @@ 
 					(const_int 2) (const_int 4))
 			  (const_int 4)])
    (set_attr "type" "alu_shift,load_byte")
-   (set_attr "pool_range" "*,1020")]
+   (set_attr "pool_range" "*,1018")]
 )
 
 ;; This pattern will only be used when ldsh is not available
@@ -5373,7 +5376,7 @@ 
    (set_attr "type" "*,*,*,load2,store2")
    (set_attr "arm_pool_range" "*,*,*,1020,*")
    (set_attr "arm_neg_pool_range" "*,*,*,1004,*")
-   (set_attr "thumb2_pool_range" "*,*,*,4096,*")
+   (set_attr "thumb2_pool_range" "*,*,*,4094,*")
    (set_attr "thumb2_neg_pool_range" "*,*,*,0,*")]
 )
 
@@ -5512,7 +5515,7 @@ 
   [(set_attr "length" "4,4,6,2,2,6,4,4")
    (set_attr "type" "*,*,*,load2,store2,load2,store2,*")
    (set_attr "insn" "*,mov,*,*,*,*,*,mov")
-   (set_attr "pool_range" "*,*,*,*,*,1020,*,*")]
+   (set_attr "pool_range" "*,*,*,*,*,1018,*,*")]
 )
 
 (define_expand "movsi"
@@ -5682,7 +5685,7 @@ 
    mov\\t%0, %1"
   [(set_attr "length" "2,2,4,4,2,2,2,2,2")
    (set_attr "type" "*,*,*,*,load1,store1,load1,store1,*")
-   (set_attr "pool_range" "*,*,*,*,*,*,1020,*,*")
+   (set_attr "pool_range" "*,*,*,*,*,*,1018,*,*")
    (set_attr "conds" "set,clob,*,*,nocond,nocond,nocond,nocond,nocond")])
 
 (define_split 
@@ -5790,7 +5793,7 @@ 
        		     		 (match_dup 2)] UNSPEC_PIC_BASE))]
  "operands[3] = TARGET_THUMB ? GEN_INT (4) : GEN_INT (8);"
  [(set_attr "type" "load1,load1,load1")
-  (set_attr "pool_range" "4096,4096,1024")
+  (set_attr "pool_range" "4096,4094,1022")
   (set_attr "neg_pool_range" "4084,0,0")
   (set_attr "arch"  "a,t2,t1")    
   (set_attr "length" "8,6,4")]
@@ -5806,7 +5809,10 @@ 
   "TARGET_32BIT && flag_pic"
   "ldr%?\\t%0, %1"
   [(set_attr "type" "load1")
-   (set_attr "pool_range" "4096")
+   (set (attr "pool_range")
+	(if_then_else (eq_attr "is_thumb" "no")
+		      (const_int 4096)
+		      (const_int 4094)))
    (set (attr "neg_pool_range")
 	(if_then_else (eq_attr "is_thumb" "no")
 		      (const_int 4084)
@@ -5819,7 +5825,7 @@ 
   "TARGET_THUMB1 && flag_pic"
   "ldr\\t%0, %1"
   [(set_attr "type" "load1")
-   (set (attr "pool_range") (const_int 1024))]
+   (set (attr "pool_range") (const_int 1018))]
 )
 
 (define_insn "pic_add_dot_plus_four"
@@ -6614,7 +6620,7 @@ 
   [(set_attr "length" "2")
    (set_attr "type" "*,load1,store1,*,*")
    (set_attr "insn" "mov,*,*,mov,mov")
-   (set_attr "pool_range" "*,1020,*,*,*")
+   (set_attr "pool_range" "*,1018,*,*,*")
    (set_attr "conds" "clob,nocond,nocond,nocond,nocond")])
 
 (define_expand "movsf"
@@ -6669,7 +6675,8 @@ 
   [(set_attr "predicable" "yes")
    (set_attr "type" "*,load1,store1")
    (set_attr "insn" "mov,*,*")
-   (set_attr "pool_range" "*,4096,*")
+   (set_attr "arm_pool_range" "*,4096,*")
+   (set_attr "thumb2_pool_range" "*,4094,*")
    (set_attr "arm_neg_pool_range" "*,4084,*")
    (set_attr "thumb2_neg_pool_range" "*,0,*")]
 )
@@ -6691,7 +6698,7 @@ 
    mov\\t%0, %1"
   [(set_attr "length" "2")
    (set_attr "type" "*,load1,store1,load1,store1,*,*")
-   (set_attr "pool_range" "*,*,*,1020,*,*,*")
+   (set_attr "pool_range" "*,*,*,1018,*,*,*")
    (set_attr "insn" "*,*,*,*,*,mov,mov")
    (set_attr "conds" "clob,nocond,nocond,nocond,nocond,nocond,nocond")]
 )
@@ -6780,7 +6787,8 @@ 
   "
   [(set_attr "length" "8,12,16,8,8")
    (set_attr "type" "*,*,*,load2,store2")
-   (set_attr "pool_range" "*,*,*,1020,*")
+   (set_attr "arm_pool_range" "*,*,*,1020,*")
+   (set_attr "thumb2_pool_range" "*,*,*,1018,*")
    (set_attr "arm_neg_pool_range" "*,*,*,1004,*")
    (set_attr "thumb2_neg_pool_range" "*,*,*,0,*")]
 )
@@ -6824,7 +6832,7 @@ 
   [(set_attr "length" "4,2,2,6,4,4")
    (set_attr "type" "*,load2,store2,load2,store2,*")
    (set_attr "insn" "*,*,*,*,*,mov")
-   (set_attr "pool_range" "*,*,*,1020,*,*")]
+   (set_attr "pool_range" "*,*,*,1018,*,*")]
 )