mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-29 22:30:33 +00:00
be6e455946
Summary: Under certain circumstances, multi-level breaks (or what is understood by the control flow passes as such) could be miscompiled in a way that causes infinite loops, by emitting incorrect control flow intrinsics. This fixes a hang in dEQP-GLES3.functional.shaders.loops.while_dynamic_iterations.conditional_continue_vertex Reviewers: arsenm, tstellarAMD Subscribers: arsenm, llvm-commits Differential Revision: http://reviews.llvm.org/D18967 llvm-svn: 266088
42 lines
1.4 KiB
LLVM
42 lines
1.4 KiB
LLVM
; RUN: opt -S -mtriple=amdgcn-- -structurizecfg -si-annotate-control-flow < %s | FileCheck %s
|
|
|
|
; CHECK-LABEL: {{^}}define amdgpu_vs void @main
|
|
; CHECK: main_body:
|
|
; CHECK: LOOP.outer:
|
|
; CHECK: LOOP:
|
|
; CHECK: [[if:%[0-9]+]] = call { i1, i64 } @llvm.amdgcn.if(
|
|
; CHECK: [[if_exec:%[0-9]+]] = extractvalue { i1, i64 } [[if]], 1
|
|
;
|
|
; CHECK: Flow:
|
|
;
|
|
; Ensure two else.break calls, for both the inner and outer loops
|
|
;
|
|
; CHECK: call i64 @llvm.amdgcn.else.break(i64 [[if_exec]],
|
|
; CHECK-NEXT: call i64 @llvm.amdgcn.else.break(i64 [[if_exec]],
|
|
; CHECK-NEXT: call void @llvm.amdgcn.end.cf
|
|
;
|
|
; CHECK: Flow1:
|
|
define amdgpu_vs void @main(<4 x float> %vec, i32 %ub, i32 %cont) {
|
|
main_body:
|
|
br label %LOOP.outer
|
|
|
|
LOOP.outer: ; preds = %ENDIF, %main_body
|
|
%tmp43 = phi i32 [ 0, %main_body ], [ %tmp47, %ENDIF ]
|
|
br label %LOOP
|
|
|
|
LOOP: ; preds = %ENDIF, %LOOP.outer
|
|
%tmp45 = phi i32 [ %tmp43, %LOOP.outer ], [ %tmp47, %ENDIF ]
|
|
%tmp47 = add i32 %tmp45, 1
|
|
%tmp48 = icmp slt i32 %tmp45, %ub
|
|
br i1 %tmp48, label %ENDIF, label %IF
|
|
|
|
IF: ; preds = %LOOP
|
|
ret void
|
|
|
|
ENDIF: ; preds = %LOOP
|
|
%tmp51 = icmp eq i32 %tmp47, %cont
|
|
br i1 %tmp51, label %LOOP, label %LOOP.outer
|
|
}
|
|
|
|
attributes #0 = { nounwind readnone }
|