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llvm-mirror/test/CodeGen/Thumb2/thumb2-ifcvt1.ll
Roman Lebedev 7dcf1654f8 [SimplifyCFG] Tail-merging all blocks with ret terminator 
Based ontop of D104598, which is a NFCI-ish refactoring.
Here, a restriction, that only empty blocks can be merged, is lifted.

Reviewed By: rnk

Differential Revision: https://reviews.llvm.org/D104597
2021-06-24 13:15:39 +03:00

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8.4 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=thumbv7-apple-darwin | FileCheck %s --check-prefixes=ALL,V01
; RUN: llc < %s -mtriple=thumbv7-apple-darwin -arm-default-it | FileCheck %s --check-prefixes=ALL,V01
; RUN: llc < %s -mtriple=thumbv8 -arm-no-restrict-it | FileCheck %s --check-prefixes=ALL,V23,V2
; RUN: llc < %s -mtriple=thumbv8 -arm-no-restrict-it -enable-tail-merge=0 | FileCheck %s --check-prefixes=ALL,V23,V3
define i32 @t1(i32 %a, i32 %b, i32 %c, i32 %d) nounwind {
; ALL-LABEL: t1:
; ALL: @ %bb.0:
; ALL-NEXT: cmp r2, #1
; ALL-NEXT: ittee ne
; ALL-NEXT: cmpne r2, #7
; ALL-NEXT: addne r0, r1
; ALL-NEXT: addeq r0, r1
; ALL-NEXT: addeq r0, #1
; ALL-NEXT: bx lr
switch i32 %c, label %cond_next [
i32 1, label %cond_true
i32 7, label %cond_true
]
cond_true:
%tmp12 = add i32 %a, 1
%tmp1518 = add i32 %tmp12, %b
ret i32 %tmp1518
cond_next:
%tmp15 = add i32 %b, %a
ret i32 %tmp15
}
define i32 @t2(i32 %a, i32 %b) nounwind {
; V01-LABEL: t2:
; V01: @ %bb.0: @ %entry
; V01-NEXT: cmp r0, r1
; V01-NEXT: it eq
; V01-NEXT: bxeq lr
; V01-NEXT: LBB1_1: @ %bb
; V01-NEXT: @ =>This Inner Loop Header: Depth=1
; V01-NEXT: cmp r0, r1
; V01-NEXT: ite gt
; V01-NEXT: subgt r0, r0, r1
; V01-NEXT: suble r1, r1, r0
; V01-NEXT: cmp r1, r0
; V01-NEXT: bne LBB1_1
; V01-NEXT: @ %bb.2: @ %bb17
; V01-NEXT: bx lr
;
; V2-LABEL: t2:
; V2: @ %bb.0: @ %entry
; V2-NEXT: cmp r0, r1
; V2-NEXT: it eq
; V2-NEXT: bxeq lr
; V2-NEXT: .LBB1_1: @ %bb
; V2-NEXT: @ =>This Inner Loop Header: Depth=1
; V2-NEXT: cmp r0, r1
; V2-NEXT: ite gt
; V2-NEXT: subgt r0, r0, r1
; V2-NEXT: suble r1, r1, r0
; V2-NEXT: cmp r1, r0
; V2-NEXT: bne .LBB1_1
; V2-NEXT: @ %bb.2: @ %bb17
; V2-NEXT: bx lr
;
; V3-LABEL: t2:
; V3: @ %bb.0: @ %entry
; V3-NEXT: cmp r0, r1
; V3-NEXT: it eq
; V3-NEXT: bxeq lr
; V3-NEXT: .LBB1_1: @ %bb
; V3-NEXT: @ =>This Inner Loop Header: Depth=1
; V3-NEXT: cmp r0, r1
; V3-NEXT: ite le
; V3-NEXT: suble r1, r1, r0
; V3-NEXT: subgt r0, r0, r1
; V3-NEXT: cmp r1, r0
; V3-NEXT: bne .LBB1_1
; V3-NEXT: @ %bb.2: @ %bb17
; V3-NEXT: bx lr
entry:
%tmp1434 = icmp eq i32 %a, %b ; <i1> [#uses=1]
br i1 %tmp1434, label %bb17, label %bb.outer
bb.outer: ; preds = %cond_false, %entry
%b_addr.021.0.ph = phi i32 [ %b, %entry ], [ %tmp10, %cond_false ] ; <i32> [#uses=5]
%a_addr.026.0.ph = phi i32 [ %a, %entry ], [ %a_addr.026.0, %cond_false ] ; <i32> [#uses=1]
br label %bb
bb: ; preds = %cond_true, %bb.outer
%indvar = phi i32 [ 0, %bb.outer ], [ %indvar.next, %cond_true ] ; <i32> [#uses=2]
%tmp. = sub i32 0, %b_addr.021.0.ph ; <i32> [#uses=1]
%tmp.40 = mul i32 %indvar, %tmp. ; <i32> [#uses=1]
%a_addr.026.0 = add i32 %tmp.40, %a_addr.026.0.ph ; <i32> [#uses=6]
%tmp3 = icmp sgt i32 %a_addr.026.0, %b_addr.021.0.ph ; <i1> [#uses=1]
br i1 %tmp3, label %cond_true, label %cond_false
cond_true: ; preds = %bb
%tmp7 = sub i32 %a_addr.026.0, %b_addr.021.0.ph ; <i32> [#uses=2]
%tmp1437 = icmp eq i32 %tmp7, %b_addr.021.0.ph ; <i1> [#uses=1]
%indvar.next = add i32 %indvar, 1 ; <i32> [#uses=1]
br i1 %tmp1437, label %bb17, label %bb
cond_false: ; preds = %bb
%tmp10 = sub i32 %b_addr.021.0.ph, %a_addr.026.0 ; <i32> [#uses=2]
%tmp14 = icmp eq i32 %a_addr.026.0, %tmp10 ; <i1> [#uses=1]
br i1 %tmp14, label %bb17, label %bb.outer
bb17: ; preds = %cond_false, %cond_true, %entry
%a_addr.026.1 = phi i32 [ %a, %entry ], [ %tmp7, %cond_true ], [ %a_addr.026.0, %cond_false ] ; <i32> [#uses=1]
ret i32 %a_addr.026.1
}
define i32 @t2_nomerge(i32 %a, i32 %b) nounwind {
; V01-LABEL: t2_nomerge:
; V01: @ %bb.0: @ %entry
; V01-NEXT: cmp r0, r1
; V01-NEXT: it eq
; V01-NEXT: bxeq lr
; V01-NEXT: LBB2_1: @ %bb
; V01-NEXT: @ =>This Inner Loop Header: Depth=1
; V01-NEXT: cmp r0, r1
; V01-NEXT: ble LBB2_3
; V01-NEXT: @ %bb.2: @ %cond_true
; V01-NEXT: @ in Loop: Header=BB2_1 Depth=1
; V01-NEXT: subs r0, r0, r1
; V01-NEXT: cmp r1, r0
; V01-NEXT: bne LBB2_1
; V01-NEXT: b LBB2_4
; V01-NEXT: LBB2_3: @ %cond_false
; V01-NEXT: @ in Loop: Header=BB2_1 Depth=1
; V01-NEXT: subs r1, r1, r0
; V01-NEXT: cmp r0, #0
; V01-NEXT: bne LBB2_1
; V01-NEXT: LBB2_4: @ %bb17
; V01-NEXT: bx lr
;
; V2-LABEL: t2_nomerge:
; V2: @ %bb.0: @ %entry
; V2-NEXT: cmp r0, r1
; V2-NEXT: it eq
; V2-NEXT: bxeq lr
; V2-NEXT: .LBB2_1: @ %bb
; V2-NEXT: @ =>This Inner Loop Header: Depth=1
; V2-NEXT: cmp r0, r1
; V2-NEXT: ble .LBB2_3
; V2-NEXT: @ %bb.2: @ %cond_true
; V2-NEXT: @ in Loop: Header=BB2_1 Depth=1
; V2-NEXT: subs r0, r0, r1
; V2-NEXT: cmp r1, r0
; V2-NEXT: bne .LBB2_1
; V2-NEXT: b .LBB2_4
; V2-NEXT: .LBB2_3: @ %cond_false
; V2-NEXT: @ in Loop: Header=BB2_1 Depth=1
; V2-NEXT: subs r1, r1, r0
; V2-NEXT: cmp r0, #0
; V2-NEXT: bne .LBB2_1
; V2-NEXT: .LBB2_4: @ %bb17
; V2-NEXT: bx lr
;
; V3-LABEL: t2_nomerge:
; V3: @ %bb.0: @ %entry
; V3-NEXT: cmp r0, r1
; V3-NEXT: beq .LBB2_4
; V3-NEXT: b .LBB2_2
; V3-NEXT: .LBB2_1: @ %cond_true
; V3-NEXT: @ in Loop: Header=BB2_2 Depth=1
; V3-NEXT: subs r0, r0, r1
; V3-NEXT: cmp r1, r0
; V3-NEXT: it eq
; V3-NEXT: bxeq lr
; V3-NEXT: .LBB2_2: @ %bb
; V3-NEXT: @ =>This Inner Loop Header: Depth=1
; V3-NEXT: cmp r0, r1
; V3-NEXT: bgt .LBB2_1
; V3-NEXT: @ %bb.3: @ %cond_false
; V3-NEXT: @ in Loop: Header=BB2_2 Depth=1
; V3-NEXT: subs r1, r1, r0
; V3-NEXT: cmp r0, #0
; V3-NEXT: bne .LBB2_2
; V3-NEXT: .LBB2_4: @ %bb17
; V3-NEXT: bx lr
entry:
%tmp1434 = icmp eq i32 %a, %b ; <i1> [#uses=1]
br i1 %tmp1434, label %bb17, label %bb.outer
bb.outer: ; preds = %cond_false, %entry
%b_addr.021.0.ph = phi i32 [ %b, %entry ], [ %tmp10, %cond_false ] ; <i32> [#uses=5]
%a_addr.026.0.ph = phi i32 [ %a, %entry ], [ %a_addr.026.0, %cond_false ] ; <i32> [#uses=1]
br label %bb
bb: ; preds = %cond_true, %bb.outer
%indvar = phi i32 [ 0, %bb.outer ], [ %indvar.next, %cond_true ] ; <i32> [#uses=2]
%tmp. = sub i32 0, %b_addr.021.0.ph ; <i32> [#uses=1]
%tmp.40 = mul i32 %indvar, %tmp. ; <i32> [#uses=1]
%a_addr.026.0 = add i32 %tmp.40, %a_addr.026.0.ph ; <i32> [#uses=6]
%tmp3 = icmp sgt i32 %a_addr.026.0, %b_addr.021.0.ph ; <i1> [#uses=1]
br i1 %tmp3, label %cond_true, label %cond_false
cond_true: ; preds = %bb
%tmp7 = sub i32 %a_addr.026.0, %b_addr.021.0.ph ; <i32> [#uses=2]
%tmp1437 = icmp eq i32 %tmp7, %b_addr.021.0.ph ; <i1> [#uses=1]
%indvar.next = add i32 %indvar, 1 ; <i32> [#uses=1]
br i1 %tmp1437, label %bb17, label %bb
cond_false: ; preds = %bb
%tmp10 = sub i32 %b_addr.021.0.ph, %a_addr.026.0 ; <i32> [#uses=2]
%tmp14 = icmp eq i32 %b_addr.021.0.ph, %tmp10 ; <i1> [#uses=1]
br i1 %tmp14, label %bb17, label %bb.outer
bb17: ; preds = %cond_false, %cond_true, %entry
%a_addr.026.1 = phi i32 [ %a, %entry ], [ %tmp7, %cond_true ], [ %a_addr.026.0, %cond_false ] ; <i32> [#uses=1]
ret i32 %a_addr.026.1
}
@x = external global i32* ; <i32**> [#uses=1]
define void @foo(i32 %a) nounwind {
; V01-LABEL: foo:
; V01: @ %bb.0: @ %entry
; V01-NEXT: movw r1, :lower16:(L_x$non_lazy_ptr-(LPC3_0+4))
; V01-NEXT: movt r1, :upper16:(L_x$non_lazy_ptr-(LPC3_0+4))
; V01-NEXT: LPC3_0:
; V01-NEXT: add r1, pc
; V01-NEXT: ldr r1, [r1]
; V01-NEXT: ldr r1, [r1]
; V01-NEXT: str r0, [r1]
; V01-NEXT: bx lr
;
; V23-LABEL: foo:
; V23: @ %bb.0: @ %entry
; V23-NEXT: movw r1, :lower16:x
; V23-NEXT: movt r1, :upper16:x
; V23-NEXT: ldr r1, [r1]
; V23-NEXT: str r0, [r1]
; V23-NEXT: bx lr
entry:
%tmp = load i32*, i32** @x ; <i32*> [#uses=1]
store i32 %a, i32* %tmp
ret void
}
define void @t3(i32 %a, i32 %b) nounwind {
; V01-LABEL: t3:
; V01: @ %bb.0: @ %entry
; V01-NEXT: cmp r0, #10
; V01-NEXT: it le
; V01-NEXT: bxle lr
; V01-NEXT: LBB4_1: @ %cond_true
; V01-NEXT: str lr, [sp, #-4]!
; V01-NEXT: mov r0, r1
; V01-NEXT: bl _foo
; V01-NEXT: ldr lr, [sp], #4
; V01-NEXT: bx lr
;
; V23-LABEL: t3:
; V23: @ %bb.0: @ %entry
; V23-NEXT: cmp r0, #10
; V23-NEXT: it le
; V23-NEXT: bxle lr
; V23-NEXT: .LBB4_1: @ %cond_true
; V23-NEXT: push {r7, lr}
; V23-NEXT: mov r0, r1
; V23-NEXT: bl foo
; V23-NEXT: pop.w {r7, lr}
; V23-NEXT: bx lr
entry:
%tmp1 = icmp sgt i32 %a, 10 ; <i1> [#uses=1]
br i1 %tmp1, label %cond_true, label %UnifiedReturnBlock
cond_true: ; preds = %entry
call void @foo( i32 %b )
ret void
UnifiedReturnBlock: ; preds = %entry
ret void
}
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