https://bugs.llvm.org/show_bug.cgi?id=51667
Bug ID: 51667
Summary: Incorrect use information after instcombine impacts
inline cost estimate
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: tomasz.mia...@gmail.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
In LLVM IR below, the h function calls functions f and g with internal linkage.
Neither f or g have any other uses, so both callsites should receive a bonus
for inlining internal function with a single use. The call to f does receive
the bonus, while g does not receive it:
$ opt a.ll -S -instcombine -inline -pass-remarks=inline
remark: <unknown>:0:0: 'f' inlined into 'h' with (cost=-15035, threshold=337)
remark: <unknown>:0:0: 'g' inlined into 'h' with (cost=-35, threshold=337)
Everything works as expected when instcombine and inline passes are run
separately:
$ opt a.ll -S -instcombine > b.ll
$ opt b.ll -S -inline -pass-remarks=inline
remark: <unknown>:0:0: 'f' inlined into 'h' with (cost=-15035, threshold=337)
remark: <unknown>:0:0: 'g' inlined into 'h' with (cost=-15035, threshold=337)
LLVM IR:
; ModuleID = 'a.ll'
source_filename = "a.a146b597-cgu.0"
target datalayout =
"e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
%0 = type { i64, i64, i64 }
%1 = type { i64, i64, i64 }
define internal void @f(%0* align 8 %a) unnamed_addr {
start:
ret void
}
define internal void @g(%0* align 8 %a) unnamed_addr {
start:
ret void
}
define void @h(%0* align 8 %a, %1* align 8 %b) unnamed_addr {
start:
call void @f(%0* align 8 %a)
call void bitcast (void (%0*)* @g to void (%1*)*)(%1* align 8 %b)
ret void
}
--
You are receiving this mail because:
You are on the CC list for the bug._______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
