Author: vitalybuka
Date: Thu Jul 11 18:42:03 2019
New Revision: 365858
URL: http://llvm.org/viewvc/llvm-project?rev=365858&view=rev
Log:
Handle IntToPtr in isBytewiseValue
Summary:
This helps with more efficient use of memset for pattern initialization
From @pcc prototype for -ftrivial-auto-var-init=pattern optimizations
Binary size change on CTMark, (with -fuse-ld=lld -Wl,--icf=all, similar results
with default linker options)
```
master patch diff
Os 8.238864e+05 8.238864e+05 0.0
O3 1.054797e+06 1.054797e+06 0.0
Os zero 8.292384e+05 8.292384e+05 0.0
O3 zero 1.062626e+06 1.062626e+06 0.0
Os pattern 8.579712e+05 8.338048e+05 -0.030299
O3 pattern 1.090502e+06 1.067574e+06 -0.020481
```
Zero vs Pattern on master
```
zero pattern diff
Os 8.292384e+05 8.579712e+05 0.036578
O3 1.062626e+06 1.090502e+06 0.025124
```
Zero vs Pattern with the patch
```
zero pattern diff
Os 8.292384e+05 8.338048e+05 0.003333
O3 1.062626e+06 1.067574e+06 0.003193
```
Reviewers: pcc, eugenis
Subscribers: hiraditya, cfe-commits, llvm-commits
Tags: #clang, #llvm
Differential Revision: https://reviews.llvm.org/D63967
Modified:
cfe/trunk/test/CodeGenCXX/auto-var-init.cpp
Modified: cfe/trunk/test/CodeGenCXX/auto-var-init.cpp
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGenCXX/auto-var-init.cpp?rev=365858&r1=365857&r2=365858&view=diff
==============================================================================
--- cfe/trunk/test/CodeGenCXX/auto-var-init.cpp (original)
+++ cfe/trunk/test/CodeGenCXX/auto-var-init.cpp Thu Jul 11 18:42:03 2019
@@ -1042,14 +1042,8 @@ TEST_UNINIT(intptr4, int*[4]);
// CHECK: %uninit = alloca [4 x i32*], align
// CHECK-NEXT: call void @{{.*}}used{{.*}}%uninit)
// PATTERN-O1-LABEL: @test_intptr4_uninit()
-// PATTERN-O1: %1 = getelementptr inbounds [4 x i32*], [4 x i32*]*
%uninit, i64 0, i64 0
-// PATTERN-O1-NEXT: store i32* inttoptr (i64 -6148914691236517206 to i32*),
i32** %1, align 16
-// PATTERN-O1-NEXT: %2 = getelementptr inbounds [4 x i32*], [4 x i32*]*
%uninit, i64 0, i64 1
-// PATTERN-O1-NEXT: store i32* inttoptr (i64 -6148914691236517206 to i32*),
i32** %2, align 8
-// PATTERN-O1-NEXT: %3 = getelementptr inbounds [4 x i32*], [4 x i32*]*
%uninit, i64 0, i64 2
-// PATTERN-O1-NEXT: store i32* inttoptr (i64 -6148914691236517206 to i32*),
i32** %3, align 16
-// PATTERN-O1-NEXT: %4 = getelementptr inbounds [4 x i32*], [4 x i32*]*
%uninit, i64 0, i64 3
-// PATTERN-O1-NEXT: store i32* inttoptr (i64 -6148914691236517206 to i32*),
i32** %4, align 8
+// PATTERN-O1: %1 = bitcast [4 x i32*]* %uninit to i8*
+// PATTERN-O1-NEXT: call void @llvm.memset.p0i8.i64(i8* nonnull align 16 %1,
i8 -86, i64 32, i1 false)
// ZERO-LABEL: @test_intptr4_uninit()
// ZERO: call void @llvm.memset{{.*}}, i8 0,
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