ee5585ed09
Improve and enable folding of conditional branches with tail calls. 1. Make it so that conditional tail calls can be emitted even when there are multiple predecessors. 2. Don't guard the transformation behind -Os. The rationale for guarding it was static-prediction can be affected by whether the branch is forward of backward. This is no longer true for almost any X86 cpus (anything newer than `SnB`) so is no longer a meaningful concern. Reviewed By: pengfei Differential Revision: https://reviews.llvm.org/D140931
149 lines
3.6 KiB
LLVM
149 lines
3.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -O1 -mcpu=atom -mtriple=i686-linux | FileCheck %s
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declare void @external_function(...)
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define i32 @test_return_val(i32 %a) nounwind {
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; CHECK-LABEL: test_return_val:
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; CHECK: # %bb.0:
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; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: retl
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ret i32 %a
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}
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define i32 @test_optsize(i32 %a) nounwind optsize {
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; CHECK-LABEL: test_optsize:
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; CHECK: # %bb.0:
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; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax
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; CHECK-NEXT: retl
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ret i32 %a
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}
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define i32 @test_minsize(i32 %a) nounwind minsize {
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; CHECK-LABEL: test_minsize:
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; CHECK: # %bb.0:
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; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax
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; CHECK-NEXT: retl
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ret i32 %a
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}
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define i32 @test_pgso(i32 %a) nounwind !prof !14 {
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; CHECK-LABEL: test_pgso:
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; CHECK: # %bb.0:
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; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax
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; CHECK-NEXT: retl
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ret i32 %a
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}
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define i32 @test_add(i32 %a, i32 %b) nounwind {
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; CHECK-LABEL: test_add:
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; CHECK: # %bb.0:
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; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax
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; CHECK-NEXT: addl {{[0-9]+}}(%esp), %eax
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: retl
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%result = add i32 %a, %b
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ret i32 %result
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}
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define i32 @test_multiple_ret(i32 %a, i32 %b, i1 %c) nounwind {
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; CHECK-LABEL: test_multiple_ret:
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; CHECK: # %bb.0:
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; CHECK-NEXT: testb $1, {{[0-9]+}}(%esp)
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; CHECK-NEXT: je .LBB5_2
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; CHECK-NEXT: # %bb.1: # %bb1
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; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: retl
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; CHECK-NEXT: .LBB5_2: # %bb2
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; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: retl
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br i1 %c, label %bb1, label %bb2
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bb1:
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ret i32 %a
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bb2:
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ret i32 %b
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}
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define void @test_call_others(i32 %x) nounwind {
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; CHECK-LABEL: test_call_others:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpl $0, {{[0-9]+}}(%esp)
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; CHECK-NEXT: jne external_function@PLT # TAILCALL
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; CHECK-NEXT: # %bb.1: # %if.end
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: retl
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%tobool = icmp eq i32 %x, 0
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br i1 %tobool, label %if.end, label %true.case
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true.case:
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tail call void @external_function() nounwind
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br label %if.end
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if.end:
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ret void
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}
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define void @test_branch_to_same_bb(i32 %x, i32 %y) nounwind {
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; CHECK-LABEL: test_branch_to_same_bb:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpl $0, {{[0-9]+}}(%esp)
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; CHECK-NEXT: jle .LBB7_2
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; CHECK-NEXT: .p2align 4, 0x90
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; CHECK-NEXT: .LBB7_1: # %while.cond
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; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: jmp .LBB7_1
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; CHECK-NEXT: .LBB7_2: # %while.end
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: retl
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%cmp = icmp sgt i32 %x, 0
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br i1 %cmp, label %while.cond, label %while.end
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while.cond:
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br label %while.cond
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while.end:
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ret void
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}
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!llvm.module.flags = !{!0}
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!0 = !{i32 1, !"ProfileSummary", !1}
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!1 = !{!2, !3, !4, !5, !6, !7, !8, !9}
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!2 = !{!"ProfileFormat", !"InstrProf"}
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!3 = !{!"TotalCount", i64 10000}
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!4 = !{!"MaxCount", i64 10}
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!5 = !{!"MaxInternalCount", i64 1}
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!6 = !{!"MaxFunctionCount", i64 1000}
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!7 = !{!"NumCounts", i64 3}
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!8 = !{!"NumFunctions", i64 3}
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!9 = !{!"DetailedSummary", !10}
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!10 = !{!11, !12, !13}
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!11 = !{i32 10000, i64 100, i32 1}
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!12 = !{i32 999000, i64 100, i32 1}
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!13 = !{i32 999999, i64 1, i32 2}
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!14 = !{!"function_entry_count", i64 0}
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