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9c6f1538cc
This patch changes cc1 option for PGO profile use from
-fprofile-instr-use=<path> to -fprofile-instrument-use-path=<path>.
-fprofile-instr-use=<path> is now a driver only option.
In addition to decouple the cc1 option from the driver level option, this patch
also enables IR level profile use. cc1 option handling now reads the profile
header and sets CodeGenOpt ProfileUse (valid values are {None, Clang, LLVM}
-- this is a common enum for -fprofile-instrument={}, for the profile
instrumentation), and invoke the pipeline to enable the respective PGO use pass.
Reviewers: silvas, davidxl
Differential Revision: http://reviews.llvm.org/D17737
llvm-svn: 262515
50 lines
1.9 KiB
C
50 lines
1.9 KiB
C
// Test that big branch weights get scaled down to 32-bits, rather than just
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// truncated.
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// RUN: llvm-profdata merge %S/Inputs/c-counter-overflows.proftext -o %t.profdata
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// RUN: %clang_cc1 -triple x86_64-apple-macosx10.9 -main-file-name c-counter-overflows.c %s -o - -emit-llvm -fprofile-instrument-use-path=%t.profdata | FileCheck %s
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typedef unsigned long long uint64_t;
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int main(int argc, const char *argv[]) {
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// Need counts higher than 32-bits.
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// CHECK: br {{.*}} !prof ![[FOR:[0-9]+]]
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// max = 0xffffffff0
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// scale = 0xffffffff0 / 0xffffffff + 1 = 17
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// loop-body: 0xffffffff0 / 17 + 1 = 0xf0f0f0f0 + 1 = 4042322161 => -252645135
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// loop-exit: 0x000000001 / 17 + 1 = 0x00000000 + 1 = 1 => 1
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for (uint64_t I = 0; I < 0xffffffff0; ++I) {
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// max = 0xffffffff * 15 = 0xefffffff1
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// scale = 0xefffffff1 / 0xffffffff + 1 = 16
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// CHECK: br {{.*}} !prof ![[IF:[0-9]+]]
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if (I & 0xf) {
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// 0xefffffff1 / 16 + 1 = 0xefffffff + 1 = 4026531840 => -268435456
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} else {
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// 0x0ffffffff / 16 + 1 = 0x0fffffff + 1 = 268435456 => 268435456
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}
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// max = 0xffffffff * 5 = 0x4fffffffb
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// scale = 0x4fffffffb / 0xffffffff + 1 = 6
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// CHECK: ], !prof ![[SWITCH:[0-9]+]]
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switch ((I & 0xf) / 5) {
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case 0:
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// 0x4fffffffb / 6 = 0xd5555554 + 1 = 3579139413 => -715827883
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break;
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case 1:
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// 0x4fffffffb / 6 = 0xd5555554 + 1 = 3579139413 => -715827883
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break;
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case 2:
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// 0x4fffffffb / 6 = 0xd5555554 + 1 = 3579139413 => -715827883
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break;
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default:
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// 0x0ffffffff / 6 = 0x2aaaaaaa + 1 = 715827883 => 715827883
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break;
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}
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}
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return 0;
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}
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// CHECK-DAG: ![[FOR]] = !{!"branch_weights", i32 -252645135, i32 1}
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// CHECK-DAG: ![[IF]] = !{!"branch_weights", i32 -268435456, i32 268435456}
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// CHECK-DAG: ![[SWITCH]] = !{!"branch_weights", i32 715827883, i32 -715827883, i32 -715827883, i32 -715827883}
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