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

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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
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3
include/llvm/Support/StandardPasses.h
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@ -100,8 +100,7 @@ namespace llvm {
if (UnitAtATime) {
PM->add(createGlobalOptimizerPass()); // Optimize out global vars
PM->add(createGlobalDCEPass()); // Remove unused fns and globs
// IP Constant Propagation
PM->add(createIPConstantPropagationPass());
PM->add(createIPSCCPPass()); // IP SCCP
PM->add(createDeadArgEliminationPass()); // Dead argument elimination
}
PM->add(createInstructionCombiningPass()); // Clean up after IPCP & DAE

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