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Include SelectionDAGISel in the opt-bisect process

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Differential Revision: http://reviews.llvm.org/D21143

llvm-svn: 274786
This commit is contained in:
Andrew Kaylor 2016-07-07 18:55:02 +00:00
parent 0442bd0563
commit c633e5a584
2 changed files with 23 additions and 1 deletions
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2
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -443,7 +443,7 @@ bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) {
TM.resetTargetOptions(Fn);
// Reset OptLevel to None for optnone functions.
CodeGenOpt::Level NewOptLevel = OptLevel;
if (Fn.hasFnAttribute(Attribute::OptimizeNone))
if (OptLevel != CodeGenOpt::None && skipFunction(Fn))
NewOptLevel = CodeGenOpt::None;
OptLevelChanger OLC(*this, NewOptLevel);

22
test/Other/X86/opt-bisect-isel.ll Normal file
View File

@ -0,0 +1,22 @@
; This test verifies that no optimizations are performed on the @f function
; when the -opt-bisect-limit=0 option is used. In particular, the X86
; instruction selector will optimize the cmp instruction to a sub instruction
; if it is not run in -O0 mode.
; RUN: llc -O3 -opt-bisect-limit=0 -o - %s | FileCheck %s
target triple = "x86_64-unknown-linux-gnu"
define void @f() {
entry:
%cmp = icmp slt i32 undef, 8
br i1 %cmp, label %middle, label %end
middle:
br label %end
end:
ret void
}
; CHECK: cmpl $8, %eax