[llvm-commits] [polly] r167251 - in /polly/trunk: lib/Analysis/Dependences.cpp test/Dependences/ test/Dependences/do_pluto_matmult.ll
Tobias Grosser
grosser at fim.uni-passau.de
Thu Nov 1 14:28:32 PDT 2012
Author: grosser
Date: Thu Nov 1 16:28:32 2012
New Revision: 167251
URL: http://llvm.org/viewvc/llvm-project?rev=167251&view=rev
Log:
Dependences: Add support to calculate memory based dependences
Instead of calculating exact value (flow) dependences, it is also possible to
calculate memory based dependences. Sometimes memory based dependences are a lot
easier to calculate. To evaluate the benefits, we add an option to calculate
memory based dependences (use -polly-value-dependences=false).
Added:
polly/trunk/test/Dependences/
polly/trunk/test/Dependences/do_pluto_matmult.ll
Modified:
polly/trunk/lib/Analysis/Dependences.cpp
Modified: polly/trunk/lib/Analysis/Dependences.cpp
URL: http://llvm.org/viewvc/llvm-project/polly/trunk/lib/Analysis/Dependences.cpp?rev=167251&r1=167250&r2=167251&view=diff
==============================================================================
--- polly/trunk/lib/Analysis/Dependences.cpp (original)
+++ polly/trunk/lib/Analysis/Dependences.cpp Thu Nov 1 16:28:32 2012
@@ -43,6 +43,11 @@
cl::desc("Disable polly legality check"), cl::Hidden,
cl::init(false));
+static cl::opt<bool>
+ ValueDependences("polly-value-dependences",
+ cl::desc("Use value instead of memory based dependences"), cl::Hidden,
+ cl::init(true));
+
//===----------------------------------------------------------------------===//
Dependences::Dependences() : ScopPass(ID) {
RAW = WAR = WAW = NULL;
@@ -82,19 +87,48 @@
collectInfo(S, &Read, &Write, &MayWrite, &Schedule);
- isl_union_map_compute_flow(isl_union_map_copy(Read),
- isl_union_map_copy(Write),
- isl_union_map_copy(MayWrite),
- isl_union_map_copy(Schedule),
- &RAW, NULL, NULL, NULL);
-
- isl_union_map_compute_flow(isl_union_map_copy(Write),
- isl_union_map_copy(Write),
- Read, Schedule,
- &WAW, &WAR, NULL, NULL);
+ if (ValueDependences) {
+ isl_union_map_compute_flow(isl_union_map_copy(Read),
+ isl_union_map_copy(Write),
+ isl_union_map_copy(MayWrite),
+ isl_union_map_copy(Schedule),
+ &RAW, NULL, NULL, NULL);
+
+ isl_union_map_compute_flow(isl_union_map_copy(Write),
+ isl_union_map_copy(Write),
+ isl_union_map_copy(Read),
+ isl_union_map_copy(Schedule),
+ &WAW, &WAR, NULL, NULL);
+ } else {
+ isl_union_map *Empty;
+
+ Empty = isl_union_map_empty(isl_union_map_get_space(Write));
+ Write = isl_union_map_union(Write, isl_union_map_copy(MayWrite));
+
+ isl_union_map_compute_flow(isl_union_map_copy(Read),
+ isl_union_map_copy(Empty),
+ isl_union_map_copy(Write),
+ isl_union_map_copy(Schedule),
+ NULL, &RAW, NULL, NULL);
+
+ isl_union_map_compute_flow(isl_union_map_copy(Write),
+ isl_union_map_copy(Empty),
+ isl_union_map_copy(Read),
+ isl_union_map_copy(Schedule),
+ NULL, &WAR, NULL, NULL);
+
+ isl_union_map_compute_flow(isl_union_map_copy(Write),
+ isl_union_map_copy(Empty),
+ isl_union_map_copy(Write),
+ isl_union_map_copy(Schedule),
+ NULL, &WAW, NULL, NULL);
+ isl_union_map_free(Empty);
+ }
isl_union_map_free(MayWrite);
isl_union_map_free(Write);
+ isl_union_map_free(Read);
+ isl_union_map_free(Schedule);
RAW = isl_union_map_coalesce(RAW);
WAW = isl_union_map_coalesce(WAW);
Added: polly/trunk/test/Dependences/do_pluto_matmult.ll
URL: http://llvm.org/viewvc/llvm-project/polly/trunk/test/Dependences/do_pluto_matmult.ll?rev=167251&view=auto
==============================================================================
--- polly/trunk/test/Dependences/do_pluto_matmult.ll (added)
+++ polly/trunk/test/Dependences/do_pluto_matmult.ll Thu Nov 1 16:28:32 2012
@@ -0,0 +1,80 @@
+; RUN: opt %loadPolly -basicaa -polly-dependences -analyze -polly-value-dependences=true < %s | FileCheck %s -check-prefix=VALUE
+; RUN: opt %loadPolly -basicaa -polly-dependences -analyze -polly-value-dependences=false < %s | FileCheck %s -check-prefix=MEMORY
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
+target triple = "x86_64-unknown-linux-gnu"
+
+%struct._IO_FILE = type { i32, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, %struct._IO_marker*, %struct._IO_FILE*, i32, i32, i64, i16, i8, [1 x i8], i8*, i64, i8*, i8*, i8*, i8*, i64, i32, [20 x i8] }
+%struct._IO_marker = type { %struct._IO_marker*, %struct._IO_FILE*, i32 }
+
+ at A = common global [36 x [49 x double]] zeroinitializer, align 8 ; <[36 x [49 x double]]*> [#uses=3]
+ at B = common global [36 x [49 x double]] zeroinitializer, align 8 ; <[36 x [49 x double]]*> [#uses=3]
+ at C = common global [36 x [49 x double]] zeroinitializer, align 8 ; <[36 x [49 x double]]*> [#uses=4]
+
+define void @do_pluto_matmult() nounwind {
+entry:
+ fence seq_cst
+ br label %do.body
+
+do.body: ; preds = %do.cond42, %entry
+ %indvar3 = phi i64 [ %indvar.next4, %do.cond42 ], [ 0, %entry ] ; <i64> [#uses=3]
+ br label %do.body1
+
+do.body1: ; preds = %do.cond36, %do.body
+ %indvar1 = phi i64 [ %indvar.next2, %do.cond36 ], [ 0, %do.body ] ; <i64> [#uses=3]
+ %arrayidx5 = getelementptr [36 x [49 x double]]* @C, i64 0, i64 %indvar3, i64 %indvar1 ; <double*> [#uses=2]
+ br label %do.body2
+
+do.body2: ; preds = %do.cond, %do.body1
+ %indvar = phi i64 [ %indvar.next, %do.cond ], [ 0, %do.body1 ] ; <i64> [#uses=3]
+ %arrayidx13 = getelementptr [36 x [49 x double]]* @A, i64 0, i64 %indvar3, i64 %indvar ; <double*> [#uses=1]
+ %arrayidx22 = getelementptr [36 x [49 x double]]* @B, i64 0, i64 %indvar, i64 %indvar1 ; <double*> [#uses=1]
+ %tmp6 = load double* %arrayidx5 ; <double> [#uses=1]
+ %mul = fmul double 1.000000e+00, %tmp6 ; <double> [#uses=1]
+ %tmp14 = load double* %arrayidx13 ; <double> [#uses=1]
+ %mul15 = fmul double 1.000000e+00, %tmp14 ; <double> [#uses=1]
+ %tmp23 = load double* %arrayidx22 ; <double> [#uses=1]
+ %mul24 = fmul double %mul15, %tmp23 ; <double> [#uses=1]
+ %add = fadd double %mul, %mul24 ; <double> [#uses=1]
+ store double %add, double* %arrayidx5
+ br label %do.cond
+
+do.cond: ; preds = %do.body2
+ %indvar.next = add i64 %indvar, 1 ; <i64> [#uses=2]
+ %exitcond = icmp ne i64 %indvar.next, 36 ; <i1> [#uses=1]
+ br i1 %exitcond, label %do.body2, label %do.end
+
+do.end: ; preds = %do.cond
+ br label %do.cond36
+
+do.cond36: ; preds = %do.end
+ %indvar.next2 = add i64 %indvar1, 1 ; <i64> [#uses=2]
+ %exitcond5 = icmp ne i64 %indvar.next2, 36 ; <i1> [#uses=1]
+ br i1 %exitcond5, label %do.body1, label %do.end39
+
+do.end39: ; preds = %do.cond36
+ br label %do.cond42
+
+do.cond42: ; preds = %do.end39
+ %indvar.next4 = add i64 %indvar3, 1 ; <i64> [#uses=2]
+ %exitcond6 = icmp ne i64 %indvar.next4, 36 ; <i1> [#uses=1]
+ br i1 %exitcond6, label %do.body, label %do.end45
+
+do.end45: ; preds = %do.cond42
+ fence seq_cst
+ ret void
+}
+
+; VALUE: RAW dependences:
+; VALUE: { Stmt_do_body2[i0, i1, i2] -> Stmt_do_body2[i0, i1, 1 + i2] : i0 >= 0 and i0 <= 35 and i1 >= 0 and i1 <= 35 and i2 >= 0 and i2 <= 34 }
+; VALUE: WAR dependences:
+; VALUE: { }
+; VALUE: WAW dependences:
+; VALUE: { Stmt_do_body2[i0, i1, i2] -> Stmt_do_body2[i0, i1, 1 + i2] : i0 >= 0 and i0 <= 35 and i1 >= 0 and i1 <= 35 and i2 >= 0 and i2 <= 34 }
+
+; MEMORY: RAW dependences:
+; MEMORY: { Stmt_do_body2[i0, i1, i2] -> Stmt_do_body2[i0, i1, o2] : i0 >= 0 and i0 <= 35 and i1 >= 0 and i1 <= 35 and i2 >= 0 and i2 <= 35 and o2 >= 1 + i2 and o2 <= 35 and o2 >= 0 }
+; MEMORY: WAR dependences:
+; MEMORY: { Stmt_do_body2[i0, i1, i2] -> Stmt_do_body2[i0, i1, o2] : i0 >= 0 and i0 <= 35 and i1 >= 0 and i1 <= 35 and i2 >= 0 and i2 <= 35 and o2 >= 1 + i2 and o2 <= 35 and o2 >= 0 }
+; MEMORY: WAW dependences:
+; MEMORY: { Stmt_do_body2[i0, i1, i2] -> Stmt_do_body2[i0, i1, o2] : i0 >= 0 and i0 <= 35 and i1 >= 0 and i1 <= 35 and i2 >= 0 and i2 <= 35 and o2 >= 1 + i2 and o2 <= 35 and o2 >= 0 }
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