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llvm-mirror/test/Other/opt-bisect-legacy-pass-manager.ll
Fangrui Song 6da5cc31da [FileCheck] Default --allow-unused-prefixes to false 
Link: https://lists.llvm.org/pipermail/llvm-dev/2020-October/146162.html "[RFC] FileCheck: (dis)allowing unused prefixes"

If a downstream project using lit needs time for transition,
add the following to `lit.local.cfg`:

```
from lit.llvm.subst import ToolSubst

fc = ToolSubst('FileCheck', unresolved='fatal')
config.substitutions.insert(0, (fc.regex, 'FileCheck --allow-unused-prefixes'))
```

Differential Revision: https://reviews.llvm.org/D95849
2021-02-08 13:37:04 -08:00

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; This file verifies the behavior of the OptBisect class, which is used to
; diagnose optimization related failures. The tests check various
; invocations that result in different sets of optimization passes that
; are run in different ways.
;
; This set of tests exercises the legacy pass manager interface to the OptBisect
; class. Because the exact set of optimizations that will be run may
; change over time, these tests are written in a more general manner than the
; corresponding tests for the new pass manager.
;
; Don't use NEXT checks or hard-code pass numbering so that this won't fail if
; new passes are inserted.
; Verify that the file can be compiled to an object file at -O3 with all
; skippable passes skipped.
; REQUIRES: default_triple
; RUN: opt -O3 -opt-bisect-limit=0 -enable-new-pm=0 < %s | llc -O3 -opt-bisect-limit=0
; Verify that no skippable passes are run with -opt-bisect-limit=0.
; RUN: opt -disable-output -disable-verify -O3 -opt-bisect-limit=0 %s -enable-new-pm=0 2>&1 \
; RUN: | FileCheck %s --check-prefix=CHECK-SKIP-ALL
; CHECK-SKIP-ALL: BISECT: NOT running pass ({{[0-9]+}})
; CHECK-SKIP-ALL-NOT: BISECT: running pass ({{[0-9]+}})
; Verify that no passes run at -O0 are skipped
; RUN: opt -opt-bisect-limit=0 < %s 2>&1 -enable-new-pm=0 | FileCheck %s --check-prefix=OPTBISECT-O0
; OPTBISECT-O0-NOT: BISECT: NOT running
; FIXME: There are still some AMDGPU passes being skipped that run at -O0.
; XFAIL: r600, amdgcn
; Verify that we can use the opt-bisect-helper.py script (derived from
; utils/bisect) to locate the optimization that inlines the call to
; f2() in f3().
; RUN: %python %S/opt-bisect-helper.py --start=0 --end=256 --optcmd=opt \
; RUN: --filecheckcmd=FileCheck --test=%s \
; RUN: --prefix=CHECK-BISECT-INLINE-HELPER \
; RUN: | FileCheck %s --check-prefix=CHECK-BISECT-INLINE-RESULT
; The helper script uses this to find the optimization that inlines the call.
; CHECK-BISECT-INLINE-HELPER: call i32 @f2()
; These checks verifies that the optimization was found.
; CHECK-BISECT-INLINE-RESULT-NOT: Last good count: 0
; CHECK-BISECT-INLINE-RESULT: Last good count: {{[0-9]+}}
; Test a module pass.
; RUN: opt -disable-output -disable-verify -deadargelim -opt-bisect-limit=-1 %s -enable-new-pm=0 \
; RUN: 2>&1 | FileCheck %s --check-prefix=CHECK-DEADARG
; CHECK-DEADARG: BISECT: running pass ({{[0-9]+}}) Dead Argument Elimination on module
; RUN: opt -disable-output -disable-verify -deadargelim -opt-bisect-limit=0 %s -enable-new-pm=0 \
; RUN: 2>&1 | FileCheck %s --check-prefix=CHECK-NOT-DEADARG
; CHECK-NOT-DEADARG: BISECT: NOT running pass ({{[0-9]+}}) Dead Argument Elimination on module
; Test an SCC pass.
; RUN: opt -disable-output -disable-verify -inline -opt-bisect-limit=-1 %s -enable-new-pm=0 \
; RUN: 2>&1 | FileCheck %s --check-prefix=CHECK-INLINE
; CHECK-INLINE: BISECT: running pass ({{[0-9]+}}) Function Integration/Inlining on SCC (<<null function>>)
; CHECK-INLINE: BISECT: running pass ({{[0-9]+}}) Function Integration/Inlining on SCC (g)
; CHECK-INLINE: BISECT: running pass ({{[0-9]+}}) Function Integration/Inlining on SCC (f1)
; CHECK-INLINE: BISECT: running pass ({{[0-9]+}}) Function Integration/Inlining on SCC (f2)
; CHECK-INLINE: BISECT: running pass ({{[0-9]+}}) Function Integration/Inlining on SCC (f3)
; CHECK-INLINE: BISECT: running pass ({{[0-9]+}}) Function Integration/Inlining on SCC (<<null function>>)
; RUN: opt -disable-output -disable-verify -inline -opt-bisect-limit=0 %s -enable-new-pm=0 \
; RUN: 2>&1 | FileCheck %s --check-prefix=CHECK-NOT-INLINE
; CHECK-NOT-INLINE: BISECT: NOT running pass ({{[0-9]+}}) Function Integration/Inlining on SCC (<<null function>>)
; CHECK-NOT-INLINE: BISECT: NOT running pass ({{[0-9]+}}) Function Integration/Inlining on SCC (g)
; CHECK-NOT-INLINE: BISECT: NOT running pass ({{[0-9]+}}) Function Integration/Inlining on SCC (f1)
; CHECK-NOT-INLINE: BISECT: NOT running pass ({{[0-9]+}}) Function Integration/Inlining on SCC (f2)
; CHECK-NOT-INLINE: BISECT: NOT running pass ({{[0-9]+}}) Function Integration/Inlining on SCC (f3)
; CHECK-NOT-INLINE: BISECT: NOT running pass ({{[0-9]+}}) Function Integration/Inlining on SCC (<<null function>>)
; Test a function pass.
; RUN: opt -disable-output -disable-verify -early-cse -earlycse-debug-hash -opt-bisect-limit=-1 -enable-new-pm=0 \
; RUN: %s 2>&1 | FileCheck %s --check-prefix=CHECK-EARLY-CSE
; CHECK-EARLY-CSE: BISECT: running pass ({{[0-9]+}}) Early CSE on function (f1)
; CHECK-EARLY-CSE: BISECT: running pass ({{[0-9]+}}) Early CSE on function (f2)
; CHECK-EARLY-CSE: BISECT: running pass ({{[0-9]+}}) Early CSE on function (f3)
; RUN: opt -disable-output -disable-verify -early-cse -earlycse-debug-hash -opt-bisect-limit=0 -enable-new-pm=0 \
; RUN: %s 2>&1 | FileCheck %s --check-prefix=CHECK-NOT-EARLY-CSE
; CHECK-NOT-EARLY-CSE: BISECT: NOT running pass ({{[0-9]+}}) Early CSE on function (f1)
; CHECK-NOT-EARLY-CSE: BISECT: NOT running pass ({{[0-9]+}}) Early CSE on function (f2)
; CHECK-NOT-EARLY-CSE: BISECT: NOT running pass ({{[0-9]+}}) Early CSE on function (f3)
; Test a loop pass.
; RUN: opt -disable-output -disable-verify -loop-reduce -opt-bisect-limit=-1 -enable-new-pm=0 \
; RUN: %s 2>&1 | FileCheck %s --check-prefix=CHECK-LOOP-REDUCE
; CHECK-LOOP-REDUCE: BISECT: running pass ({{[0-9]+}}) Loop Strength Reduction on loop
; CHECK-LOOP-REDUCE: BISECT: running pass ({{[0-9]+}}) Loop Strength Reduction on loop
; CHECK-LOOP-REDUCE: BISECT: running pass ({{[0-9]+}}) Loop Strength Reduction on loop
; CHECK-LOOP-REDUCE: BISECT: running pass ({{[0-9]+}}) Loop Strength Reduction on loop
; CHECK-LOOP-REDUCE: BISECT: running pass ({{[0-9]+}}) Loop Strength Reduction on loop
; RUN: opt -disable-output -disable-verify -loop-reduce -opt-bisect-limit=0 -enable-new-pm=0 \
; RUN: %s 2>&1 | FileCheck %s --check-prefix=CHECK-NOT-LOOP-REDUCE
; CHECK-NOT-LOOP-REDUCE: BISECT: NOT running pass ({{[0-9]+}}) Loop Strength Reduction on loop
; CHECK-NOT-LOOP-REDUCE: BISECT: NOT running pass ({{[0-9]+}}) Loop Strength Reduction on loop
; CHECK-NOT-LOOP-REDUCE: BISECT: NOT running pass ({{[0-9]+}}) Loop Strength Reduction on loop
; CHECK-NOT-LOOP-REDUCE: BISECT: NOT running pass ({{[0-9]+}}) Loop Strength Reduction on loop
; CHECK-NOT-LOOP-REDUCE: BISECT: NOT running pass ({{[0-9]+}}) Loop Strength Reduction on loop
declare i32 @g()
define void @f1() {
entry:
br label %loop.0
loop.0:
br i1 undef, label %loop.0.0, label %loop.1
loop.0.0:
br i1 undef, label %loop.0.0, label %loop.0.1
loop.0.1:
br i1 undef, label %loop.0.1, label %loop.0
loop.1:
br i1 undef, label %loop.1, label %loop.1.bb1
loop.1.bb1:
br i1 undef, label %loop.1, label %loop.1.bb2
loop.1.bb2:
br i1 undef, label %end, label %loop.1.0
loop.1.0:
br i1 undef, label %loop.1.0, label %loop.1
end:
ret void
}
define i32 @f2() {
entry:
ret i32 0
}
define i32 @f3() {
entry:
%temp = call i32 @g()
%icmp = icmp ugt i32 %temp, 2
br i1 %icmp, label %bb.true, label %bb.false
bb.true:
%temp2 = call i32 @f2()
ret i32 %temp2
bb.false:
ret i32 0
}
; This function is here to verify that opt-bisect can skip all passes for
; functions that contain lifetime intrinsics.
define void @f4() {
entry:
%i = alloca i32, align 4
%tmp = bitcast i32* %i to i8*
call void @llvm.lifetime.start(i64 4, i8* %tmp)
br label %for.cond
for.cond:
br i1 undef, label %for.body, label %for.end
for.body:
br label %for.cond
for.end:
ret void
}
declare void @llvm.lifetime.start(i64, i8* nocapture)
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