6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-27 14:24:40 +00:00
Code Issues Projects Releases Wiki Activity

We currently only run ipsccp at LTO time, which is silly. It subsumes

Browse Source 
ipconstprop and doesn't take much time.  Just run it in its place.

This adds a testcase for it, which I plan to expand to cover other
"integration" cases, where we expect the optimizer to be able to
eliminate various things.  Due to phase order issues we've regressed
in a number of areas and integration tests are the only way I see to
prevent this.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85729 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-11-01 18:57:49 +00:00
parent c4775e4b97
commit 0037bfabd4
2 changed files with 20 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
include/llvm/Support/StandardPasses.h
View File

@ -100,8 +100,7 @@ namespace llvm {
if (UnitAtATime) { if (UnitAtATime) {
PM->add(createGlobalOptimizerPass()); // Optimize out global vars PM->add(createGlobalOptimizerPass()); // Optimize out global vars
PM->add(createGlobalDCEPass()); // Remove unused fns and globs PM->add(createGlobalDCEPass()); // Remove unused fns and globs
// IP Constant Propagation PM->add(createIPSCCPPass()); // IP SCCP
PM->add(createIPConstantPropagationPass());
PM->add(createDeadArgEliminationPass()); // Dead argument elimination PM->add(createDeadArgEliminationPass()); // Dead argument elimination
} }
PM->add(createInstructionCombiningPass()); // Clean up after IPCP & DAE PM->add(createInstructionCombiningPass()); // Clean up after IPCP & DAE

19
test/FrontendC++/integration-O2.cpp Normal file
View File

@ -0,0 +1,19 @@
// RUN: %llvmgxx %s -O2 -S -o - | FileCheck %s
// This test verifies that we get expected codegen out of the -O2 optimization
// level from the full optimizer.
// Verify that ipsccp is running and can eliminate globals.
static int test1g = 42;
void test1f1() {
if (test1g == 0) test1g = 0;
}
int test1f2() {
return test1g;
}
// CHECK: @_Z7test1f2v()
// CHECK: entry:
// CHECK-NEXT: ret i32 42