mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-18 18:42:46 +02:00
c76b3878ca
If the loop trip count may underflow or wrap, the compiler should not generate a hardware loop since the trip count will be incorrect. llvm-svn: 237365
23 lines
611 B
LLVM
23 lines
611 B
LLVM
; RUN: llc -march=hexagon -mcpu=hexagonv5 < %s | FileCheck %s
|
|
|
|
; We shouldn't generate a hardware loop in this case because the initial
|
|
; value may be zero, which means the endloop instruction will not decrement
|
|
; the loop counter, and the loop will execute only once.
|
|
|
|
; CHECK-NOT: loop0
|
|
|
|
define void @foo(i32 %count, i32 %v) #0 {
|
|
entry:
|
|
br label %do.body
|
|
|
|
do.body:
|
|
%count.addr.0 = phi i32 [ %count, %entry ], [ %dec, %do.body ]
|
|
tail call void asm sideeffect "nop", ""() #1
|
|
%dec = add i32 %count.addr.0, -1
|
|
%cmp = icmp eq i32 %dec, 0
|
|
br i1 %cmp, label %do.end, label %do.body
|
|
|
|
do.end:
|
|
ret void
|
|
}
|