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93786da2cb
Much to my surprise, '-disable-llvm-optzns' which I thought was the magical flag I wanted to get at the raw LLVM IR coming out of Clang deosn't do that. It still runs some passes over the IR. I don't want that, I really want the *raw* IR coming out of Clang and I strongly suspect everyone else using it is in the same camp. There is actually a flag that does what I want that I didn't know about called '-disable-llvm-passes'. I suspect many others don't know about it either. It both does what I want and is much simpler. This removes the confusing version and makes that spelling of the flag an alias for '-disable-llvm-passes'. I've also moved everything in Clang to use the 'passes' spelling as it seems both more accurate (*all* LLVM passes are disabled, not just optimizations) and much easier to remember and spell correctly. This is part of simplifying how Clang drives LLVM to make it cleaner to wire up to the new pass manager. Differential Revision: https://reviews.llvm.org/D28047 llvm-svn: 290392
81 lines
2.0 KiB
C
81 lines
2.0 KiB
C
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s -O1 -disable-llvm-passes | FileCheck %s --check-prefix=ALL --check-prefix=O1
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// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s -O0 | FileCheck %s --check-prefix=ALL --check-prefix=O0
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// In all tests, make sure that no expect is generated if optimizations are off.
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// If optimizations are on, generate the correct expect and preserve other necessary operations.
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int expect_taken(int x) {
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// ALL-LABEL: define i32 @expect_taken
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// O1: call i64 @llvm.expect.i64(i64 {{%.*}}, i64 1)
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// O0-NOT: @llvm.expect
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if (__builtin_expect (x, 1))
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return 0;
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return x;
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}
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int expect_not_taken(int x) {
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// ALL-LABEL: define i32 @expect_not_taken
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// O1: call i64 @llvm.expect.i64(i64 {{%.*}}, i64 0)
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// O0-NOT: @llvm.expect
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if (__builtin_expect (x, 0))
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return 0;
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return x;
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}
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int x;
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int y(void);
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void foo();
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void expect_value_side_effects() {
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// ALL-LABEL: define void @expect_value_side_effects()
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// ALL: [[CALL:%.*]] = call i32 @y
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// O1: [[SEXT:%.*]] = sext i32 [[CALL]] to i64
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// O1: call i64 @llvm.expect.i64(i64 {{%.*}}, i64 [[SEXT]])
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// O0-NOT: @llvm.expect
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if (__builtin_expect (x, y()))
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foo ();
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}
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// Make sure that issigprocmask() is called before bar()?
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// There's no compare, so there's nothing to expect?
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// rdar://9330105
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void isigprocmask(void);
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long bar();
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int main() {
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// ALL-LABEL: define i32 @main()
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// ALL: call void @isigprocmask()
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// ALL: [[CALL:%.*]] = call i64 (...) @bar()
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// O1: call i64 @llvm.expect.i64(i64 0, i64 [[CALL]])
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// O0-NOT: @llvm.expect
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(void) __builtin_expect((isigprocmask(), 0), bar());
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}
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int switch_cond(int x) {
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// ALL-LABEL: define i32 @switch_cond
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// O1: call i64 @llvm.expect.i64(i64 {{%.*}}, i64 5)
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// O0-NOT: @llvm.expect
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switch(__builtin_expect(x, 5)) {
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default:
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return 0;
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case 0:
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case 1:
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case 2:
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return 1;
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case 5:
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return 5;
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};
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return 0;
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}
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