https://llvm.org/bugs/show_bug.cgi?id=28765
Bug ID: 28765
Summary: Post-RA scheduler moves code across asm sideeffect
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: matthew.arsena...@amd.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
define void @loop(i32 addrspace(1)* %arg) nounwind {
bb:
br label %bb2
bb2:
%loop.idx = phi i32 [ 0, %bb ], [ %inc, %bb2 ]
call void asm sideeffect "
v_nop_e64
v_nop_e64", ""()
%inc = add nsw i32 %loop.idx, 1
%cmp = icmp slt i32 %inc, 10
br i1 %cmp, label %bb2, label %bb3 ; -
bb3:
ret void
}
llc -march=amdgcn on this testcase shows the add and compare are moved before
the inlineasm by the post-RA scheduler:
BB0_1: ; %bb2
; =>This Inner Loop Header: Depth=1
v_add_i32_e32 v0, vcc, 1, v0
v_cmp_gt_i32_e32 vcc, 10, v0
;;#ASMSTART
v_nop_e64
v_nop_e64
;;#ASMEND
s_and_b64 vcc, exec, vcc
s_cbranch_vccnz BB0_1
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