You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
84 lines
2.3 KiB
84 lines
2.3 KiB
; RUN: llc < %s -march=r600 -mcpu=redwood -r600-ir-structurize=0 | FileCheck %s
|
|
; Test case for a crash in the AMDILCFGStructurizer from a CFG like this:
|
|
;
|
|
; entry
|
|
; / \
|
|
; diamond_head branch_from
|
|
; / \ |
|
|
; diamond_false diamond_true
|
|
; \ /
|
|
; done
|
|
;
|
|
; When the diamond_true branch had more than 100 instructions.
|
|
;
|
|
;
|
|
|
|
; CHECK-LABEL: {{^}}branch_into_diamond:
|
|
; === entry block:
|
|
; CHECK: ALU_PUSH_BEFORE
|
|
; === Branch instruction (IF):
|
|
; CHECK: JUMP
|
|
; === branch_from block
|
|
; CHECK: ALU
|
|
; === Duplicated diamond_true block (There can be more than one ALU clause):
|
|
; === XXX: We should be able to optimize this so the basic block is not
|
|
; === duplicated. See comments in
|
|
; === AMDGPUCFGStructurizer::improveSimpleJumpintoIf()
|
|
; CHECK: ALU
|
|
; === Branch instruction (ELSE):
|
|
; CHECK: ELSE
|
|
; === diamond_head block:
|
|
; CHECK: ALU_PUSH_BEFORE
|
|
; === Branch instruction (IF):
|
|
; CHECK: JUMP
|
|
; === diamond_true block (There can be more than one ALU clause):
|
|
; ALU
|
|
; === Branch instruction (ELSE):
|
|
; CHECK: ELSE
|
|
; === diamond_false block plus implicit ENDIF
|
|
; CHECK: ALU_POP_AFTER
|
|
; === Branch instruction (ENDIF):
|
|
; CHECK: POP
|
|
; === done block:
|
|
; CHECK: ALU
|
|
; CHECK: MEM_RAT_CACHELESS
|
|
; CHECK: CF_END
|
|
|
|
|
|
define void @branch_into_diamond(i32 addrspace(1)* %out, i32 %a, i32 %b, i32 %c) {
|
|
entry:
|
|
%0 = icmp ne i32 %a, 0
|
|
br i1 %0, label %diamond_head, label %branch_from
|
|
|
|
diamond_head:
|
|
%1 = icmp ne i32 %a, 1
|
|
br i1 %1, label %diamond_true, label %diamond_false
|
|
|
|
branch_from:
|
|
%2 = add i32 %a, 1
|
|
br label %diamond_true
|
|
|
|
diamond_false:
|
|
%3 = add i32 %a, 2
|
|
br label %done
|
|
|
|
diamond_true:
|
|
%4 = phi i32 [%2, %branch_from], [%a, %diamond_head]
|
|
; This block needs to be > 100 ISA instructions to hit the bug,
|
|
; so we'll use udiv instructions.
|
|
%div0 = udiv i32 %a, %b
|
|
%div1 = udiv i32 %div0, %4
|
|
%div2 = udiv i32 %div1, 11
|
|
%div3 = udiv i32 %div2, %a
|
|
%div4 = udiv i32 %div3, %b
|
|
%div5 = udiv i32 %div4, %c
|
|
%div6 = udiv i32 %div5, %div0
|
|
%div7 = udiv i32 %div6, %div1
|
|
br label %done
|
|
|
|
done:
|
|
%5 = phi i32 [%3, %diamond_false], [%div7, %diamond_true]
|
|
store i32 %5, i32 addrspace(1)* %out
|
|
ret void
|
|
}
|