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llvm-project/llvm/test/CodeGen/RISCV/remat.ll

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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -O1 -mtriple=riscv32 -verify-machineinstrs < %s \
; RUN: | FileCheck %s -check-prefix=RV32I
@a = common global i32 0, align 4
@l = common global i32 0, align 4
@b = common global i32 0, align 4
@c = common global i32 0, align 4
@d = common global i32 0, align 4
@e = common global i32 0, align 4
@k = common global i32 0, align 4
@f = common global i32 0, align 4
@j = common global i32 0, align 4
@g = common global i32 0, align 4
@i = common global i32 0, align 4
@h = common global i32 0, align 4
; This test case benefits from codegen recognising that some values are
; trivially rematerialisable, meaning they are recreated rather than saved to
; the stack and restored. It creates high register pressure to force this
; situation.
define i32 @test() nounwind {
; RV32I-LABEL: test:
; RV32I: # %bb.0: # %entry
; RV32I-NEXT: addi sp, sp, -64
; RV32I-NEXT: sw ra, 60(sp)
; RV32I-NEXT: sw s0, 56(sp)
; RV32I-NEXT: sw s1, 52(sp)
; RV32I-NEXT: sw s2, 48(sp)
; RV32I-NEXT: sw s3, 44(sp)
; RV32I-NEXT: sw s4, 40(sp)
; RV32I-NEXT: sw s5, 36(sp)
; RV32I-NEXT: sw s6, 32(sp)
; RV32I-NEXT: sw s7, 28(sp)
; RV32I-NEXT: sw s8, 24(sp)
; RV32I-NEXT: sw s9, 20(sp)
; RV32I-NEXT: sw s10, 16(sp)
; RV32I-NEXT: sw s11, 12(sp)
; RV32I-NEXT: lui s9, %hi(a)
; RV32I-NEXT: lw a0, %lo(a)(s9)
; RV32I-NEXT: beqz a0, .LBB0_11
; RV32I-NEXT: # %bb.1: # %for.body.preheader
; RV32I-NEXT: lui s2, %hi(l)
; RV32I-NEXT: lui s3, %hi(k)
; RV32I-NEXT: lui s4, %hi(j)
; RV32I-NEXT: lui s6, %hi(i)
; RV32I-NEXT: lui s5, %hi(h)
; RV32I-NEXT: lui s7, %hi(g)
; RV32I-NEXT: lui s8, %hi(f)
; RV32I-NEXT: lui s1, %hi(e)
; RV32I-NEXT: lui s0, %hi(d)
; RV32I-NEXT: lui s10, %hi(c)
; RV32I-NEXT: lui s11, %hi(b)
; RV32I-NEXT: lw a1, %lo(l)(s2)
; RV32I-NEXT: bnez a1, .LBB0_4
; RV32I-NEXT: j .LBB0_5
; RV32I-NEXT: .LBB0_2: # %for.inc
; RV32I-NEXT: # in Loop: Header=BB0_5 Depth=1
; RV32I-NEXT: lw a0, %lo(a)(s9)
; RV32I-NEXT: addi a0, a0, -1
; RV32I-NEXT: sw a0, %lo(a)(s9)
; RV32I-NEXT: beqz a0, .LBB0_11
; RV32I-NEXT: # %bb.3: # %for.body
; RV32I-NEXT: # in Loop: Header=BB0_5 Depth=1
; RV32I-NEXT: lw a1, %lo(l)(s2)
; RV32I-NEXT: beqz a1, .LBB0_5
; RV32I-NEXT: .LBB0_4: # %if.then
; RV32I-NEXT: lw a4, %lo(e)(s1)
; RV32I-NEXT: lw a3, %lo(d)(s0)
; RV32I-NEXT: lw a2, %lo(c)(s10)
; RV32I-NEXT: lw a1, %lo(b)(s11)
; RV32I-NEXT: addi a5, zero, 32
; RV32I-NEXT: call foo
; RV32I-NEXT: .LBB0_5: # %if.end
; RV32I-NEXT: # =>This Inner Loop Header: Depth=1
; RV32I-NEXT: lw a0, %lo(k)(s3)
; RV32I-NEXT: beqz a0, .LBB0_7
; RV32I-NEXT: # %bb.6: # %if.then3
; RV32I-NEXT: # in Loop: Header=BB0_5 Depth=1
; RV32I-NEXT: lw a4, %lo(f)(s8)
; RV32I-NEXT: lw a3, %lo(e)(s1)
; RV32I-NEXT: lw a2, %lo(d)(s0)
; RV32I-NEXT: lw a1, %lo(c)(s10)
; RV32I-NEXT: lw a0, %lo(b)(s11)
; RV32I-NEXT: addi a5, zero, 64
; RV32I-NEXT: call foo
; RV32I-NEXT: .LBB0_7: # %if.end5
; RV32I-NEXT: # in Loop: Header=BB0_5 Depth=1
; RV32I-NEXT: lw a0, %lo(j)(s4)
; RV32I-NEXT: beqz a0, .LBB0_9
; RV32I-NEXT: # %bb.8: # %if.then7
; RV32I-NEXT: # in Loop: Header=BB0_5 Depth=1
; RV32I-NEXT: lw a4, %lo(g)(s7)
; RV32I-NEXT: lw a3, %lo(f)(s8)
; RV32I-NEXT: lw a2, %lo(e)(s1)
; RV32I-NEXT: lw a1, %lo(d)(s0)
; RV32I-NEXT: lw a0, %lo(c)(s10)
; RV32I-NEXT: addi a5, zero, 32
; RV32I-NEXT: call foo
; RV32I-NEXT: .LBB0_9: # %if.end9
; RV32I-NEXT: # in Loop: Header=BB0_5 Depth=1
; RV32I-NEXT: lw a0, %lo(i)(s6)
; RV32I-NEXT: beqz a0, .LBB0_2
; RV32I-NEXT: # %bb.10: # %if.then11
; RV32I-NEXT: # in Loop: Header=BB0_5 Depth=1
; RV32I-NEXT: lw a4, %lo(h)(s5)
; RV32I-NEXT: lw a3, %lo(g)(s7)
; RV32I-NEXT: lw a2, %lo(f)(s8)
; RV32I-NEXT: lw a1, %lo(e)(s1)
; RV32I-NEXT: lw a0, %lo(d)(s0)
; RV32I-NEXT: addi a5, zero, 32
; RV32I-NEXT: call foo
; RV32I-NEXT: j .LBB0_2
; RV32I-NEXT: .LBB0_11: # %for.end
; RV32I-NEXT: addi a0, zero, 1
; RV32I-NEXT: lw s11, 12(sp)
; RV32I-NEXT: lw s10, 16(sp)
; RV32I-NEXT: lw s9, 20(sp)
; RV32I-NEXT: lw s8, 24(sp)
; RV32I-NEXT: lw s7, 28(sp)
; RV32I-NEXT: lw s6, 32(sp)
; RV32I-NEXT: lw s5, 36(sp)
; RV32I-NEXT: lw s4, 40(sp)
; RV32I-NEXT: lw s3, 44(sp)
; RV32I-NEXT: lw s2, 48(sp)
; RV32I-NEXT: lw s1, 52(sp)
; RV32I-NEXT: lw s0, 56(sp)
; RV32I-NEXT: lw ra, 60(sp)
; RV32I-NEXT: addi sp, sp, 64
; RV32I-NEXT: ret
entry:
%.pr = load i32, i32* @a, align 4
%tobool14 = icmp eq i32 %.pr, 0
br i1 %tobool14, label %for.end, label %for.body
for.body: ; preds = %entry, %for.inc
%0 = phi i32 [ %dec, %for.inc ], [ %.pr, %entry ]
%1 = load i32, i32* @l, align 4
%tobool1 = icmp eq i32 %1, 0
br i1 %tobool1, label %if.end, label %if.then
if.then: ; preds = %for.body
%2 = load i32, i32* @b, align 4
%3 = load i32, i32* @c, align 4
%4 = load i32, i32* @d, align 4
%5 = load i32, i32* @e, align 4
%call = tail call i32 @foo(i32 %0, i32 %2, i32 %3, i32 %4, i32 %5, i32 32) #3
br label %if.end
if.end: ; preds = %for.body, %if.then
%6 = load i32, i32* @k, align 4
%tobool2 = icmp eq i32 %6, 0
br i1 %tobool2, label %if.end5, label %if.then3
if.then3: ; preds = %if.end
%7 = load i32, i32* @b, align 4
%8 = load i32, i32* @c, align 4
%9 = load i32, i32* @d, align 4
%10 = load i32, i32* @e, align 4
%11 = load i32, i32* @f, align 4
%call4 = tail call i32 @foo(i32 %7, i32 %8, i32 %9, i32 %10, i32 %11, i32 64) #3
br label %if.end5
if.end5: ; preds = %if.end, %if.then3
%12 = load i32, i32* @j, align 4
%tobool6 = icmp eq i32 %12, 0
br i1 %tobool6, label %if.end9, label %if.then7
if.then7: ; preds = %if.end5
%13 = load i32, i32* @c, align 4
%14 = load i32, i32* @d, align 4
%15 = load i32, i32* @e, align 4
%16 = load i32, i32* @f, align 4
%17 = load i32, i32* @g, align 4
%call8 = tail call i32 @foo(i32 %13, i32 %14, i32 %15, i32 %16, i32 %17, i32 32) #3
br label %if.end9
if.end9: ; preds = %if.end5, %if.then7
%18 = load i32, i32* @i, align 4
%tobool10 = icmp eq i32 %18, 0
br i1 %tobool10, label %for.inc, label %if.then11
if.then11: ; preds = %if.end9
%19 = load i32, i32* @d, align 4
%20 = load i32, i32* @e, align 4
%21 = load i32, i32* @f, align 4
%22 = load i32, i32* @g, align 4
%23 = load i32, i32* @h, align 4
%call12 = tail call i32 @foo(i32 %19, i32 %20, i32 %21, i32 %22, i32 %23, i32 32) #3
br label %for.inc
for.inc: ; preds = %if.end9, %if.then11
%24 = load i32, i32* @a, align 4
%dec = add nsw i32 %24, -1
store i32 %dec, i32* @a, align 4
%tobool = icmp eq i32 %dec, 0
br i1 %tobool, label %for.end, label %for.body
for.end: ; preds = %for.inc, %entry
ret i32 1
}
declare i32 @foo(i32, i32, i32, i32, i32, i32)
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