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release/21.x: [LoongArch] Strengthen stack size estimation for LSX/LASX extension (#146455) #149777

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Jul 24, 2025
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release/21.x: [LoongArch] Strengthen stack size estimation for LSX/LASX extension (#146455) #149777

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7 changes: 6 additions & 1 deletion llvm/lib/Target/LoongArch/LoongArchFrameLowering.cpp
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Expand Up @@ -158,7 +158,12 @@ void LoongArchFrameLowering::processFunctionBeforeFrameFinalized(
// estimateStackSize has been observed to under-estimate the final stack
// size, so give ourselves wiggle-room by checking for stack size
// representable an 11-bit signed field rather than 12-bits.
if (!isInt<11>(MFI.estimateStackSize(MF)))
// For [x]vstelm.{b/h/w/d} memory instructions with 8 imm offset, 7-bit
// signed field is fine.
unsigned EstimateStackSize = MFI.estimateStackSize(MF);
if (!isInt<11>(EstimateStackSize) ||
(MF.getSubtarget<LoongArchSubtarget>().hasExtLSX() &&
!isInt<7>(EstimateStackSize)))
ScavSlotsNum = std::max(ScavSlotsNum, 1u);

// For CFR spill.
Expand Down
48 changes: 24 additions & 24 deletions llvm/test/CodeGen/LoongArch/calling-conv-common.ll
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Expand Up @@ -122,23 +122,23 @@ define i64 @callee_large_scalars(i256 %a, i256 %b) nounwind {
define i64 @caller_large_scalars() nounwind {
; CHECK-LABEL: caller_large_scalars:
; CHECK: # %bb.0:
; CHECK-NEXT: addi.d $sp, $sp, -80
; CHECK-NEXT: st.d $ra, $sp, 72 # 8-byte Folded Spill
; CHECK-NEXT: st.d $zero, $sp, 24
; CHECK-NEXT: addi.d $sp, $sp, -96
; CHECK-NEXT: st.d $ra, $sp, 88 # 8-byte Folded Spill
; CHECK-NEXT: st.d $zero, $sp, 40
; CHECK-NEXT: vrepli.b $vr0, 0
; CHECK-NEXT: vst $vr0, $sp, 8
; CHECK-NEXT: vst $vr0, $sp, 24
; CHECK-NEXT: ori $a0, $zero, 2
; CHECK-NEXT: st.d $a0, $sp, 0
; CHECK-NEXT: st.d $zero, $sp, 56
; CHECK-NEXT: vst $vr0, $sp, 40
; CHECK-NEXT: st.d $a0, $sp, 16
; CHECK-NEXT: st.d $zero, $sp, 72
; CHECK-NEXT: vst $vr0, $sp, 56
; CHECK-NEXT: ori $a2, $zero, 1
; CHECK-NEXT: addi.d $a0, $sp, 32
; CHECK-NEXT: addi.d $a1, $sp, 0
; CHECK-NEXT: st.d $a2, $sp, 32
; CHECK-NEXT: addi.d $a0, $sp, 48
; CHECK-NEXT: addi.d $a1, $sp, 16
; CHECK-NEXT: st.d $a2, $sp, 48
; CHECK-NEXT: pcaddu18i $ra, %call36(callee_large_scalars)
; CHECK-NEXT: jirl $ra, $ra, 0
; CHECK-NEXT: ld.d $ra, $sp, 72 # 8-byte Folded Reload
; CHECK-NEXT: addi.d $sp, $sp, 80
; CHECK-NEXT: ld.d $ra, $sp, 88 # 8-byte Folded Reload
; CHECK-NEXT: addi.d $sp, $sp, 96
; CHECK-NEXT: ret
%1 = call i64 @callee_large_scalars(i256 1, i256 2)
ret i64 %1
Expand Down Expand Up @@ -177,33 +177,33 @@ define i64 @callee_large_scalars_exhausted_regs(i64 %a, i64 %b, i64 %c, i64 %d,
define i64 @caller_large_scalars_exhausted_regs() nounwind {
; CHECK-LABEL: caller_large_scalars_exhausted_regs:
; CHECK: # %bb.0:
; CHECK-NEXT: addi.d $sp, $sp, -96
; CHECK-NEXT: st.d $ra, $sp, 88 # 8-byte Folded Spill
; CHECK-NEXT: addi.d $a0, $sp, 16
; CHECK-NEXT: addi.d $sp, $sp, -112
; CHECK-NEXT: st.d $ra, $sp, 104 # 8-byte Folded Spill
; CHECK-NEXT: addi.d $a0, $sp, 32
; CHECK-NEXT: st.d $a0, $sp, 8
; CHECK-NEXT: ori $a0, $zero, 9
; CHECK-NEXT: st.d $a0, $sp, 0
; CHECK-NEXT: st.d $zero, $sp, 40
; CHECK-NEXT: st.d $zero, $sp, 56
; CHECK-NEXT: vrepli.b $vr0, 0
; CHECK-NEXT: vst $vr0, $sp, 24
; CHECK-NEXT: vst $vr0, $sp, 40
; CHECK-NEXT: ori $a0, $zero, 10
; CHECK-NEXT: st.d $a0, $sp, 16
; CHECK-NEXT: st.d $zero, $sp, 72
; CHECK-NEXT: st.d $a0, $sp, 32
; CHECK-NEXT: st.d $zero, $sp, 88
; CHECK-NEXT: ori $a0, $zero, 8
; CHECK-NEXT: st.d $a0, $sp, 48
; CHECK-NEXT: st.d $a0, $sp, 64
; CHECK-NEXT: ori $a0, $zero, 1
; CHECK-NEXT: ori $a1, $zero, 2
; CHECK-NEXT: ori $a2, $zero, 3
; CHECK-NEXT: ori $a3, $zero, 4
; CHECK-NEXT: ori $a4, $zero, 5
; CHECK-NEXT: ori $a5, $zero, 6
; CHECK-NEXT: ori $a6, $zero, 7
; CHECK-NEXT: addi.d $a7, $sp, 48
; CHECK-NEXT: vst $vr0, $sp, 56
; CHECK-NEXT: addi.d $a7, $sp, 64
; CHECK-NEXT: vst $vr0, $sp, 72
; CHECK-NEXT: pcaddu18i $ra, %call36(callee_large_scalars_exhausted_regs)
; CHECK-NEXT: jirl $ra, $ra, 0
; CHECK-NEXT: ld.d $ra, $sp, 88 # 8-byte Folded Reload
; CHECK-NEXT: addi.d $sp, $sp, 96
; CHECK-NEXT: ld.d $ra, $sp, 104 # 8-byte Folded Reload
; CHECK-NEXT: addi.d $sp, $sp, 112
; CHECK-NEXT: ret
%1 = call i64 @callee_large_scalars_exhausted_regs(
i64 1, i64 2, i64 3, i64 4, i64 5, i64 6, i64 7, i256 8, i64 9,
Expand Down
16 changes: 8 additions & 8 deletions llvm/test/CodeGen/LoongArch/calling-conv-half.ll
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Expand Up @@ -1252,8 +1252,8 @@ define i32 @caller_half_on_stack() nounwind {
;
; LA64F-LP64S-LABEL: caller_half_on_stack:
; LA64F-LP64S: # %bb.0:
; LA64F-LP64S-NEXT: addi.d $sp, $sp, -80
; LA64F-LP64S-NEXT: st.d $ra, $sp, 72 # 8-byte Folded Spill
; LA64F-LP64S-NEXT: addi.d $sp, $sp, -96
; LA64F-LP64S-NEXT: st.d $ra, $sp, 88 # 8-byte Folded Spill
; LA64F-LP64S-NEXT: lu12i.w $a0, -12
; LA64F-LP64S-NEXT: ori $a1, $a0, 3200
; LA64F-LP64S-NEXT: lu32i.d $a1, 0
Expand Down Expand Up @@ -1292,8 +1292,8 @@ define i32 @caller_half_on_stack() nounwind {
; LA64F-LP64S-NEXT: st.w $t0, $sp, 0
; LA64F-LP64S-NEXT: pcaddu18i $ra, %call36(callee_half_on_stack)
; LA64F-LP64S-NEXT: jirl $ra, $ra, 0
; LA64F-LP64S-NEXT: ld.d $ra, $sp, 72 # 8-byte Folded Reload
; LA64F-LP64S-NEXT: addi.d $sp, $sp, 80
; LA64F-LP64S-NEXT: ld.d $ra, $sp, 88 # 8-byte Folded Reload
; LA64F-LP64S-NEXT: addi.d $sp, $sp, 96
; LA64F-LP64S-NEXT: ret
;
; LA64F-LP64D-LABEL: caller_half_on_stack:
Expand Down Expand Up @@ -1336,8 +1336,8 @@ define i32 @caller_half_on_stack() nounwind {
;
; LA64D-LP64S-LABEL: caller_half_on_stack:
; LA64D-LP64S: # %bb.0:
; LA64D-LP64S-NEXT: addi.d $sp, $sp, -80
; LA64D-LP64S-NEXT: st.d $ra, $sp, 72 # 8-byte Folded Spill
; LA64D-LP64S-NEXT: addi.d $sp, $sp, -96
; LA64D-LP64S-NEXT: st.d $ra, $sp, 88 # 8-byte Folded Spill
; LA64D-LP64S-NEXT: lu12i.w $a0, -12
; LA64D-LP64S-NEXT: ori $a1, $a0, 3200
; LA64D-LP64S-NEXT: lu32i.d $a1, 0
Expand Down Expand Up @@ -1376,8 +1376,8 @@ define i32 @caller_half_on_stack() nounwind {
; LA64D-LP64S-NEXT: st.w $t0, $sp, 0
; LA64D-LP64S-NEXT: pcaddu18i $ra, %call36(callee_half_on_stack)
; LA64D-LP64S-NEXT: jirl $ra, $ra, 0
; LA64D-LP64S-NEXT: ld.d $ra, $sp, 72 # 8-byte Folded Reload
; LA64D-LP64S-NEXT: addi.d $sp, $sp, 80
; LA64D-LP64S-NEXT: ld.d $ra, $sp, 88 # 8-byte Folded Reload
; LA64D-LP64S-NEXT: addi.d $sp, $sp, 96
; LA64D-LP64S-NEXT: ret
;
; LA64D-LP64D-LABEL: caller_half_on_stack:
Expand Down
44 changes: 22 additions & 22 deletions llvm/test/CodeGen/LoongArch/can-not-realign-stack.ll
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Expand Up @@ -14,41 +14,41 @@
define dso_local noundef signext i32 @main() nounwind {
; CHECK-LABEL: main:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: addi.d $sp, $sp, -272
; CHECK-NEXT: st.d $ra, $sp, 264 # 8-byte Folded Spill
; CHECK-NEXT: addi.d $sp, $sp, -288
; CHECK-NEXT: st.d $ra, $sp, 280 # 8-byte Folded Spill
; CHECK-NEXT: pcalau12i $a0, %pc_hi20(.LCPI0_0)
; CHECK-NEXT: xvld $xr0, $a0, %pc_lo12(.LCPI0_0)
; CHECK-NEXT: xvst $xr0, $sp, 96 # 32-byte Folded Spill
; CHECK-NEXT: xvst $xr0, $sp, 112 # 32-byte Folded Spill
; CHECK-NEXT: pcalau12i $a0, %pc_hi20(.LCPI0_1)
; CHECK-NEXT: xvld $xr1, $a0, %pc_lo12(.LCPI0_1)
; CHECK-NEXT: xvst $xr1, $sp, 64 # 32-byte Folded Spill
; CHECK-NEXT: xvst $xr1, $sp, 80 # 32-byte Folded Spill
; CHECK-NEXT: pcalau12i $a0, %pc_hi20(.LCPI0_2)
; CHECK-NEXT: xvld $xr2, $a0, %pc_lo12(.LCPI0_2)
; CHECK-NEXT: xvst $xr2, $sp, 32 # 32-byte Folded Spill
; CHECK-NEXT: xvst $xr2, $sp, 48 # 32-byte Folded Spill
; CHECK-NEXT: pcalau12i $a0, %pc_hi20(.LCPI0_3)
; CHECK-NEXT: xvld $xr3, $a0, %pc_lo12(.LCPI0_3)
; CHECK-NEXT: xvst $xr3, $sp, 0 # 32-byte Folded Spill
; CHECK-NEXT: xvst $xr0, $sp, 136
; CHECK-NEXT: xvst $xr1, $sp, 168
; CHECK-NEXT: xvst $xr2, $sp, 200
; CHECK-NEXT: xvst $xr3, $sp, 232
; CHECK-NEXT: addi.d $a0, $sp, 136
; CHECK-NEXT: xvst $xr3, $sp, 16 # 32-byte Folded Spill
; CHECK-NEXT: xvst $xr0, $sp, 152
; CHECK-NEXT: xvst $xr1, $sp, 184
; CHECK-NEXT: xvst $xr2, $sp, 216
; CHECK-NEXT: xvst $xr3, $sp, 248
; CHECK-NEXT: addi.d $a0, $sp, 152
; CHECK-NEXT: pcaddu18i $ra, %call36(foo)
; CHECK-NEXT: jirl $ra, $ra, 0
; CHECK-NEXT: xvld $xr0, $sp, 96 # 32-byte Folded Reload
; CHECK-NEXT: xvst $xr0, $sp, 136
; CHECK-NEXT: xvld $xr0, $sp, 64 # 32-byte Folded Reload
; CHECK-NEXT: xvst $xr0, $sp, 168
; CHECK-NEXT: xvld $xr0, $sp, 32 # 32-byte Folded Reload
; CHECK-NEXT: xvst $xr0, $sp, 200
; CHECK-NEXT: xvld $xr0, $sp, 0 # 32-byte Folded Reload
; CHECK-NEXT: xvst $xr0, $sp, 232
; CHECK-NEXT: addi.d $a0, $sp, 136
; CHECK-NEXT: xvld $xr0, $sp, 112 # 32-byte Folded Reload
; CHECK-NEXT: xvst $xr0, $sp, 152
; CHECK-NEXT: xvld $xr0, $sp, 80 # 32-byte Folded Reload
; CHECK-NEXT: xvst $xr0, $sp, 184
; CHECK-NEXT: xvld $xr0, $sp, 48 # 32-byte Folded Reload
; CHECK-NEXT: xvst $xr0, $sp, 216
; CHECK-NEXT: xvld $xr0, $sp, 16 # 32-byte Folded Reload
; CHECK-NEXT: xvst $xr0, $sp, 248
; CHECK-NEXT: addi.d $a0, $sp, 152
; CHECK-NEXT: pcaddu18i $ra, %call36(bar)
; CHECK-NEXT: jirl $ra, $ra, 0
; CHECK-NEXT: move $a0, $zero
; CHECK-NEXT: ld.d $ra, $sp, 264 # 8-byte Folded Reload
; CHECK-NEXT: addi.d $sp, $sp, 272
; CHECK-NEXT: ld.d $ra, $sp, 280 # 8-byte Folded Reload
; CHECK-NEXT: addi.d $sp, $sp, 288
; CHECK-NEXT: ret
entry:
%s = alloca %struct.S, align 2
Expand Down
4 changes: 2 additions & 2 deletions llvm/test/CodeGen/LoongArch/emergency-spill-slot.ll
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Expand Up @@ -28,12 +28,12 @@ define void @func() {
; CHECK-NEXT: ld.w $a3, $a1, 0
; CHECK-NEXT: ld.w $a2, $a1, 0
; CHECK-NEXT: ld.w $a0, $a1, 0
; CHECK-NEXT: st.d $fp, $sp, 0
; CHECK-NEXT: st.d $fp, $sp, 0 # 8-byte Folded Spill
; CHECK-NEXT: lu12i.w $fp, 1
; CHECK-NEXT: ori $fp, $fp, 12
; CHECK-NEXT: add.d $fp, $sp, $fp
; CHECK-NEXT: st.w $t8, $fp, 0
; CHECK-NEXT: ld.d $fp, $sp, 0
; CHECK-NEXT: ld.d $fp, $sp, 0 # 8-byte Folded Reload
; CHECK-NEXT: st.w $t8, $a1, 0
; CHECK-NEXT: st.w $t7, $a1, 0
; CHECK-NEXT: st.w $t6, $a1, 0
Expand Down
107 changes: 91 additions & 16 deletions llvm/test/CodeGen/LoongArch/frame.ll
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@@ -1,26 +1,42 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc --mtriple=loongarch64 -mattr=+d < %s | FileCheck %s
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
; RUN: llc --mtriple=loongarch64 -mattr=+d,-lsx < %s | FileCheck %s --check-prefixes=CHECK,NOLSX
; RUN: llc --mtriple=loongarch64 -mattr=+d,+lsx < %s | FileCheck %s --check-prefixes=CHECK,LSX

%struct.key_t = type { i32, [16 x i8] }

declare void @llvm.memset.p0.i64(ptr, i8, i64, i1)
declare void @test1(ptr)

define i32 @test() nounwind {
; CHECK-LABEL: test:
; CHECK: # %bb.0:
; CHECK-NEXT: addi.d $sp, $sp, -32
; CHECK-NEXT: st.d $ra, $sp, 24 # 8-byte Folded Spill
; CHECK-NEXT: st.w $zero, $sp, 16
; CHECK-NEXT: vrepli.b $vr0, 0
; CHECK-NEXT: vst $vr0, $sp, 0
; CHECK-NEXT: addi.d $a0, $sp, 4
; CHECK-NEXT: pcaddu18i $ra, %call36(test1)
; CHECK-NEXT: jirl $ra, $ra, 0
; CHECK-NEXT: move $a0, $zero
; CHECK-NEXT: ld.d $ra, $sp, 24 # 8-byte Folded Reload
; CHECK-NEXT: addi.d $sp, $sp, 32
; CHECK-NEXT: ret
; NOLSX-LABEL: test:
; NOLSX: # %bb.0:
; NOLSX-NEXT: addi.d $sp, $sp, -32
; NOLSX-NEXT: st.d $ra, $sp, 24 # 8-byte Folded Spill
; NOLSX-NEXT: st.w $zero, $sp, 16
; NOLSX-NEXT: st.d $zero, $sp, 8
; NOLSX-NEXT: st.d $zero, $sp, 0
; NOLSX-NEXT: addi.d $a0, $sp, 4
; NOLSX-NEXT: pcaddu18i $ra, %call36(test1)
; NOLSX-NEXT: jirl $ra, $ra, 0
; NOLSX-NEXT: move $a0, $zero
; NOLSX-NEXT: ld.d $ra, $sp, 24 # 8-byte Folded Reload
; NOLSX-NEXT: addi.d $sp, $sp, 32
; NOLSX-NEXT: ret
;
; LSX-LABEL: test:
; LSX: # %bb.0:
; LSX-NEXT: addi.d $sp, $sp, -32
; LSX-NEXT: st.d $ra, $sp, 24 # 8-byte Folded Spill
; LSX-NEXT: st.w $zero, $sp, 16
; LSX-NEXT: vrepli.b $vr0, 0
; LSX-NEXT: vst $vr0, $sp, 0
; LSX-NEXT: addi.d $a0, $sp, 4
; LSX-NEXT: pcaddu18i $ra, %call36(test1)
; LSX-NEXT: jirl $ra, $ra, 0
; LSX-NEXT: move $a0, $zero
; LSX-NEXT: ld.d $ra, $sp, 24 # 8-byte Folded Reload
; LSX-NEXT: addi.d $sp, $sp, 32
; LSX-NEXT: ret
%key = alloca %struct.key_t, align 4
call void @llvm.memset.p0.i64(ptr %key, i8 0, i64 20, i1 false)
%1 = getelementptr inbounds %struct.key_t, ptr %key, i64 0, i32 1, i64 0
Expand Down Expand Up @@ -98,3 +114,62 @@ define void @test_large_frame_size_1234576() "frame-pointer"="all" {
%1 = alloca i8, i32 1234567
ret void
}

;; Note: will create an emergency spill slot, if (!isInt<7>(StackSize)).
;; Should involve only one SP-adjusting addi per adjustment.
;; LSX 112 + 16(emergency solt) = 128
define void @test_frame_size_112() {
; NOLSX-LABEL: test_frame_size_112:
; NOLSX: # %bb.0:
; NOLSX-NEXT: addi.d $sp, $sp, -112
; NOLSX-NEXT: .cfi_def_cfa_offset 112
; NOLSX-NEXT: addi.d $sp, $sp, 112
; NOLSX-NEXT: ret
;
; LSX-LABEL: test_frame_size_112:
; LSX: # %bb.0:
; LSX-NEXT: addi.d $sp, $sp, -128
; LSX-NEXT: .cfi_def_cfa_offset 128
; LSX-NEXT: addi.d $sp, $sp, 128
; LSX-NEXT: ret
%1 = alloca i8, i32 112
ret void
}

;; LSX 128 + 16(emergency solt) = 144
define void @test_frame_size_128() {
; NOLSX-LABEL: test_frame_size_128:
; NOLSX: # %bb.0:
; NOLSX-NEXT: addi.d $sp, $sp, -128
; NOLSX-NEXT: .cfi_def_cfa_offset 128
; NOLSX-NEXT: addi.d $sp, $sp, 128
; NOLSX-NEXT: ret
;
; LSX-LABEL: test_frame_size_128:
; LSX: # %bb.0:
; LSX-NEXT: addi.d $sp, $sp, -144
; LSX-NEXT: .cfi_def_cfa_offset 144
; LSX-NEXT: addi.d $sp, $sp, 144
; LSX-NEXT: ret
%1 = alloca i8, i32 128
ret void
}

;; LSX 144 + 16(emergency solt) = 160
define void @test_frame_size_144() {
; NOLSX-LABEL: test_frame_size_144:
; NOLSX: # %bb.0:
; NOLSX-NEXT: addi.d $sp, $sp, -144
; NOLSX-NEXT: .cfi_def_cfa_offset 144
; NOLSX-NEXT: addi.d $sp, $sp, 144
; NOLSX-NEXT: ret
;
; LSX-LABEL: test_frame_size_144:
; LSX: # %bb.0:
; LSX-NEXT: addi.d $sp, $sp, -160
; LSX-NEXT: .cfi_def_cfa_offset 160
; LSX-NEXT: addi.d $sp, $sp, 160
; LSX-NEXT: ret
%1 = alloca i8, i32 144
ret void
}
8 changes: 4 additions & 4 deletions llvm/test/CodeGen/LoongArch/intrinsic-memcpy.ll
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Expand Up @@ -6,19 +6,19 @@
define void @box(ptr noalias nocapture noundef writeonly sret(%Box) align 16 dereferenceable(48) %b, i64 %i) {
; CHECK-LABEL: box:
; CHECK: # %bb.0:
; CHECK-NEXT: addi.d $sp, $sp, -96
; CHECK-NEXT: .cfi_def_cfa_offset 96
; CHECK-NEXT: addi.d $sp, $sp, -112
; CHECK-NEXT: .cfi_def_cfa_offset 112
; CHECK-NEXT: slli.d $a2, $a1, 5
; CHECK-NEXT: alsl.d $a1, $a1, $a2, 4
; CHECK-NEXT: addi.d $a2, $sp, 0
; CHECK-NEXT: addi.d $a2, $sp, 16
; CHECK-NEXT: add.d $a3, $a2, $a1
; CHECK-NEXT: vldx $vr0, $a1, $a2
; CHECK-NEXT: vld $vr1, $a3, 32
; CHECK-NEXT: vld $vr2, $a3, 16
; CHECK-NEXT: vst $vr0, $a0, 0
; CHECK-NEXT: vst $vr1, $a0, 32
; CHECK-NEXT: vst $vr2, $a0, 16
; CHECK-NEXT: addi.d $sp, $sp, 96
; CHECK-NEXT: addi.d $sp, $sp, 112
; CHECK-NEXT: ret
%1 = alloca [2 x %Box], align 16
%2 = getelementptr inbounds [2 x %Box], ptr %1, i64 0, i64 %i
Expand Down
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