mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 03:33:20 +01:00
224555f18c
The bug: I missed adding break statements in the switch / case. Original commit message: [SCEV] Teach SCEV some axioms about non-wrapping arithmetic Summary: - A s< (A + C)<nsw> if C > 0 - A s<= (A + C)<nsw> if C >= 0 - (A + C)<nsw> s< A if C < 0 - (A + C)<nsw> s<= A if C <= 0 Right now `C` needs to be a constant, but we can later generalize it to be a non-constant if needed. Reviewers: atrick, hfinkel, reames, nlewycky Subscribers: sanjoy, llvm-commits Differential Revision: http://reviews.llvm.org/D13686 llvm-svn: 252236
31 lines
683 B
LLVM
31 lines
683 B
LLVM
; RUN: opt -S -indvars < %s | FileCheck %s
|
|
|
|
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
|
|
target triple = "x86_64-apple-macosx10.11.0"
|
|
|
|
declare void @use(i1)
|
|
|
|
define void @f(i32 %x) {
|
|
; CHECK-LABEL: @f(
|
|
entry:
|
|
%conv = sext i32 %x to i64
|
|
%sub = add i64 %conv, -1
|
|
%ec = icmp sgt i32 %x, 0
|
|
br i1 %ec, label %loop, label %leave
|
|
|
|
loop:
|
|
; CHECK: loop:
|
|
%iv = phi i64 [ 0, %entry ], [ %iv.inc, %loop ]
|
|
%iv.inc = add i64 %iv, 1
|
|
%cmp = icmp slt i64 %iv, %sub
|
|
call void @use(i1 %cmp)
|
|
; CHECK: call void @use(i1 %cmp)
|
|
; CHECK-NOT: call void @use(i1 true)
|
|
|
|
%be.cond = icmp slt i64 %iv.inc, %conv
|
|
br i1 %be.cond, label %loop, label %leave
|
|
|
|
leave:
|
|
ret void
|
|
}
|