[llvm] 597b77f - Add -disable-builtin option to opt
Dimitry Andric via llvm-commits
llvm-commits at lists.llvm.org
Wed Nov 13 12:33:10 PST 2019
Author: Dimitry Andric
Date: 2019-11-13T21:32:49+01:00
New Revision: 597b77fb7ff9419c502a0bfa582688d1e70d0309
URL: https://github.com/llvm/llvm-project/commit/597b77fb7ff9419c502a0bfa582688d1e70d0309
DIFF: https://github.com/llvm/llvm-project/commit/597b77fb7ff9419c502a0bfa582688d1e70d0309.diff
LOG: Add -disable-builtin option to opt
Summary:
The option allows to disable specific target library builtin functions,
instead of -disable-simplify-libcalls, which disables all of them.
This is a prerequisite for D70143, which fixes PR43081.
Reviewers: xbolva00, spatel, jdoerfert, efriedma
Reviewed By: efriedma
Subscribers: llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D70193
Added:
llvm/test/Transforms/InstCombine/disable-builtin.ll
Modified:
llvm/tools/opt/opt.cpp
Removed:
################################################################################
diff --git a/llvm/test/Transforms/InstCombine/disable-builtin.ll b/llvm/test/Transforms/InstCombine/disable-builtin.ll
new file mode 100644
index 000000000000..a301b914b860
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/disable-builtin.ll
@@ -0,0 +1,21 @@
+; Test that -disable-builtin works correctly.
+;
+; RUN: opt < %s -instcombine -disable-builtin strcat -S | FileCheck %s
+;
+; RUN: not opt < %s -instcombine -disable-builtin foobar -S 2>&1 | FileCheck --check-prefix=FOOBAR %s
+; FOOBAR: cannot disable nonexistent builtin function foobar
+
+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-S128"
+
+ at empty = constant [1 x i8] c"\00", align 1
+
+declare i8* @strcat(i8*, i8*)
+
+define i8* @test_strcat(i8* %x) {
+; CHECK-LABEL: @test_strcat(
+ %empty = getelementptr [1 x i8], [1 x i8]* @empty, i32 0, i32 0
+ %ret = call i8* @strcat(i8* %x, i8* %empty)
+ ret i8* %ret
+; CHECK: call i8* @strcat
+}
+
diff --git a/llvm/tools/opt/opt.cpp b/llvm/tools/opt/opt.cpp
index 1ad6079f67ba..092932237fd6 100644
--- a/llvm/tools/opt/opt.cpp
+++ b/llvm/tools/opt/opt.cpp
@@ -193,6 +193,12 @@ static cl::opt<bool>
DisableSimplifyLibCalls("disable-simplify-libcalls",
cl::desc("Disable simplify-libcalls"));
+static cl::list<std::string>
+DisableBuiltins("disable-builtin",
+ cl::desc("Disable specific target library builtin function"),
+ cl::ZeroOrMore);
+
+
static cl::opt<bool>
Quiet("q", cl::desc("Obsolete option"), cl::Hidden);
@@ -726,6 +732,19 @@ int main(int argc, char **argv) {
// The -disable-simplify-libcalls flag actually disables all builtin optzns.
if (DisableSimplifyLibCalls)
TLII.disableAllFunctions();
+ else {
+ // Disable individual builtin functions in TargetLibraryInfo.
+ LibFunc F;
+ for (auto &FuncName : DisableBuiltins)
+ if (TLII.getLibFunc(FuncName, F))
+ TLII.setUnavailable(F);
+ else {
+ errs() << argv[0] << ": cannot disable nonexistent builtin function "
+ << FuncName << '\n';
+ return 1;
+ }
+ }
+
Passes.add(new TargetLibraryInfoWrapperPass(TLII));
// Add internal analysis passes from the target machine.
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