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clang-p2996/llvm/test/CodeGen/AMDGPU/strict_fsub.f16.ll
Jay Foad 3eb2281bc0 [AMDGPU] Aggressively fold immediates in SIFoldOperands 
Previously SIFoldOperands::foldInstOperand would only fold a
non-inlinable immediate into a single user, so as not to increase code
size by adding the same 32-bit literal operand to many instructions.

This patch removes that restriction, so that a non-inlinable immediate
will be folded into any number of users. The rationale is:
- It reduces the number of registers used for holding constant values,
  which might increase occupancy. (On the other hand, many of these
  registers are SGPRs which no longer affect occupancy on GFX10+.)
- It reduces ALU stalls between the instruction that loads a constant
  into a register, and the instruction that uses it.
- The above benefits are expected to outweigh any increase in code size.

Differential Revision: https://reviews.llvm.org/D114643
2022-05-18 10:19:35 +01:00

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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=amdgcn-mesa-mesa3d -mcpu=gfx900 < %s | FileCheck -check-prefixes=GCN,GFX9 %s
; RUN: llc -mtriple=amdgcn-mesa-mesa3d -mcpu=fiji < %s | FileCheck -check-prefixes=GCN,GFX8 %s
; RUN: llc -mtriple=amdgcn-mesa-mesa3d -mcpu=gfx1010 < %s | FileCheck -check-prefixes=GFX10 %s
; FIXME: promotion not handled without f16 insts
define half @v_constained_fsub_f16_fpexcept_strict(half %x, half %y) #0 {
; GCN-LABEL: v_constained_fsub_f16_fpexcept_strict:
; GCN: ; %bb.0:
; GCN-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GCN-NEXT: v_sub_f16_e32 v0, v0, v1
; GCN-NEXT: s_setpc_b64 s[30:31]
;
; GFX10-LABEL: v_constained_fsub_f16_fpexcept_strict:
; GFX10: ; %bb.0:
; GFX10-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX10-NEXT: s_waitcnt_vscnt null, 0x0
; GFX10-NEXT: v_sub_f16_e32 v0, v0, v1
; GFX10-NEXT: s_setpc_b64 s[30:31]
%val = call half @llvm.experimental.constrained.fsub.f16(half %x, half %y, metadata !"round.tonearest", metadata !"fpexcept.strict")
ret half %val
}
define half @v_constained_fsub_f16_fpexcept_ignore(half %x, half %y) #0 {
; GCN-LABEL: v_constained_fsub_f16_fpexcept_ignore:
; GCN: ; %bb.0:
; GCN-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GCN-NEXT: v_sub_f16_e32 v0, v0, v1
; GCN-NEXT: s_setpc_b64 s[30:31]
;
; GFX10-LABEL: v_constained_fsub_f16_fpexcept_ignore:
; GFX10: ; %bb.0:
; GFX10-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX10-NEXT: s_waitcnt_vscnt null, 0x0
; GFX10-NEXT: v_sub_f16_e32 v0, v0, v1
; GFX10-NEXT: s_setpc_b64 s[30:31]
%val = call half @llvm.experimental.constrained.fsub.f16(half %x, half %y, metadata !"round.tonearest", metadata !"fpexcept.ignore")
ret half %val
}
define half @v_constained_fsub_f16_fpexcept_maytrap(half %x, half %y) #0 {
; GCN-LABEL: v_constained_fsub_f16_fpexcept_maytrap:
; GCN: ; %bb.0:
; GCN-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GCN-NEXT: v_sub_f16_e32 v0, v0, v1
; GCN-NEXT: s_setpc_b64 s[30:31]
;
; GFX10-LABEL: v_constained_fsub_f16_fpexcept_maytrap:
; GFX10: ; %bb.0:
; GFX10-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX10-NEXT: s_waitcnt_vscnt null, 0x0
; GFX10-NEXT: v_sub_f16_e32 v0, v0, v1
; GFX10-NEXT: s_setpc_b64 s[30:31]
%val = call half @llvm.experimental.constrained.fsub.f16(half %x, half %y, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
ret half %val
}
define <2 x half> @v_constained_fsub_v2f16_fpexcept_strict(<2 x half> %x, <2 x half> %y) #0 {
; GFX9-LABEL: v_constained_fsub_v2f16_fpexcept_strict:
; GFX9: ; %bb.0:
; GFX9-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX9-NEXT: v_sub_f16_sdwa v2, v0, v1 dst_sel:DWORD dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX9-NEXT: v_sub_f16_e32 v0, v0, v1
; GFX9-NEXT: v_lshl_or_b32 v0, v2, 16, v0
; GFX9-NEXT: s_setpc_b64 s[30:31]
;
; GFX8-LABEL: v_constained_fsub_v2f16_fpexcept_strict:
; GFX8: ; %bb.0:
; GFX8-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX8-NEXT: v_sub_f16_sdwa v2, v0, v1 dst_sel:WORD_1 dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX8-NEXT: v_sub_f16_e32 v0, v0, v1
; GFX8-NEXT: v_or_b32_e32 v0, v0, v2
; GFX8-NEXT: s_setpc_b64 s[30:31]
;
; GFX10-LABEL: v_constained_fsub_v2f16_fpexcept_strict:
; GFX10: ; %bb.0:
; GFX10-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX10-NEXT: s_waitcnt_vscnt null, 0x0
; GFX10-NEXT: v_sub_f16_e32 v2, v0, v1
; GFX10-NEXT: v_sub_f16_sdwa v0, v0, v1 dst_sel:DWORD dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX10-NEXT: v_and_b32_e32 v1, 0xffff, v2
; GFX10-NEXT: v_lshl_or_b32 v0, v0, 16, v1
; GFX10-NEXT: s_setpc_b64 s[30:31]
%val = call <2 x half> @llvm.experimental.constrained.fsub.v2f16(<2 x half> %x, <2 x half> %y, metadata !"round.tonearest", metadata !"fpexcept.strict")
ret <2 x half> %val
}
define <2 x half> @v_constained_fsub_v2f16_fpexcept_ignore(<2 x half> %x, <2 x half> %y) #0 {
; GFX9-LABEL: v_constained_fsub_v2f16_fpexcept_ignore:
; GFX9: ; %bb.0:
; GFX9-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX9-NEXT: v_sub_f16_sdwa v2, v0, v1 dst_sel:DWORD dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX9-NEXT: v_sub_f16_e32 v0, v0, v1
; GFX9-NEXT: v_lshl_or_b32 v0, v2, 16, v0
; GFX9-NEXT: s_setpc_b64 s[30:31]
;
; GFX8-LABEL: v_constained_fsub_v2f16_fpexcept_ignore:
; GFX8: ; %bb.0:
; GFX8-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX8-NEXT: v_sub_f16_sdwa v2, v0, v1 dst_sel:WORD_1 dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX8-NEXT: v_sub_f16_e32 v0, v0, v1
; GFX8-NEXT: v_or_b32_e32 v0, v0, v2
; GFX8-NEXT: s_setpc_b64 s[30:31]
;
; GFX10-LABEL: v_constained_fsub_v2f16_fpexcept_ignore:
; GFX10: ; %bb.0:
; GFX10-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX10-NEXT: s_waitcnt_vscnt null, 0x0
; GFX10-NEXT: v_sub_f16_e32 v2, v0, v1
; GFX10-NEXT: v_sub_f16_sdwa v0, v0, v1 dst_sel:DWORD dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX10-NEXT: v_and_b32_e32 v1, 0xffff, v2
; GFX10-NEXT: v_lshl_or_b32 v0, v0, 16, v1
; GFX10-NEXT: s_setpc_b64 s[30:31]
%val = call <2 x half> @llvm.experimental.constrained.fsub.v2f16(<2 x half> %x, <2 x half> %y, metadata !"round.tonearest", metadata !"fpexcept.ignore")
ret <2 x half> %val
}
define <2 x half> @v_constained_fsub_v2f16_fpexcept_maytrap(<2 x half> %x, <2 x half> %y) #0 {
; GFX9-LABEL: v_constained_fsub_v2f16_fpexcept_maytrap:
; GFX9: ; %bb.0:
; GFX9-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX9-NEXT: v_sub_f16_sdwa v2, v0, v1 dst_sel:DWORD dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX9-NEXT: v_sub_f16_e32 v0, v0, v1
; GFX9-NEXT: v_lshl_or_b32 v0, v2, 16, v0
; GFX9-NEXT: s_setpc_b64 s[30:31]
;
; GFX8-LABEL: v_constained_fsub_v2f16_fpexcept_maytrap:
; GFX8: ; %bb.0:
; GFX8-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX8-NEXT: v_sub_f16_sdwa v2, v0, v1 dst_sel:WORD_1 dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX8-NEXT: v_sub_f16_e32 v0, v0, v1
; GFX8-NEXT: v_or_b32_e32 v0, v0, v2
; GFX8-NEXT: s_setpc_b64 s[30:31]
;
; GFX10-LABEL: v_constained_fsub_v2f16_fpexcept_maytrap:
; GFX10: ; %bb.0:
; GFX10-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX10-NEXT: s_waitcnt_vscnt null, 0x0
; GFX10-NEXT: v_sub_f16_e32 v2, v0, v1
; GFX10-NEXT: v_sub_f16_sdwa v0, v0, v1 dst_sel:DWORD dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX10-NEXT: v_and_b32_e32 v1, 0xffff, v2
; GFX10-NEXT: v_lshl_or_b32 v0, v0, 16, v1
; GFX10-NEXT: s_setpc_b64 s[30:31]
%val = call <2 x half> @llvm.experimental.constrained.fsub.v2f16(<2 x half> %x, <2 x half> %y, metadata !"round.tonearest", metadata !"fpexcept.maytrap")
ret <2 x half> %val
}
define <3 x half> @v_constained_fsub_v3f16_fpexcept_strict(<3 x half> %x, <3 x half> %y) #0 {
; GFX9-LABEL: v_constained_fsub_v3f16_fpexcept_strict:
; GFX9: ; %bb.0:
; GFX9-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX9-NEXT: v_sub_f16_sdwa v4, v0, v2 dst_sel:DWORD dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX9-NEXT: v_sub_f16_e32 v0, v0, v2
; GFX9-NEXT: v_lshl_or_b32 v0, v4, 16, v0
; GFX9-NEXT: v_sub_f16_e32 v1, v1, v3
; GFX9-NEXT: s_setpc_b64 s[30:31]
;
; GFX8-LABEL: v_constained_fsub_v3f16_fpexcept_strict:
; GFX8: ; %bb.0:
; GFX8-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX8-NEXT: v_sub_f16_sdwa v4, v0, v2 dst_sel:WORD_1 dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX8-NEXT: v_sub_f16_e32 v0, v0, v2
; GFX8-NEXT: v_or_b32_e32 v0, v0, v4
; GFX8-NEXT: v_sub_f16_e32 v1, v1, v3
; GFX8-NEXT: s_setpc_b64 s[30:31]
;
; GFX10-LABEL: v_constained_fsub_v3f16_fpexcept_strict:
; GFX10: ; %bb.0:
; GFX10-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX10-NEXT: s_waitcnt_vscnt null, 0x0
; GFX10-NEXT: v_sub_f16_e32 v4, v0, v2
; GFX10-NEXT: v_sub_f16_sdwa v0, v0, v2 dst_sel:DWORD dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX10-NEXT: v_sub_f16_e32 v1, v1, v3
; GFX10-NEXT: v_and_b32_e32 v2, 0xffff, v4
; GFX10-NEXT: v_lshl_or_b32 v0, v0, 16, v2
; GFX10-NEXT: s_setpc_b64 s[30:31]
%val = call <3 x half> @llvm.experimental.constrained.fsub.v3f16(<3 x half> %x, <3 x half> %y, metadata !"round.tonearest", metadata !"fpexcept.strict")
ret <3 x half> %val
}
; FIXME: Scalarized
define <4 x half> @v_constained_fsub_v4f16_fpexcept_strict(<4 x half> %x, <4 x half> %y) #0 {
; GFX9-LABEL: v_constained_fsub_v4f16_fpexcept_strict:
; GFX9: ; %bb.0:
; GFX9-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX9-NEXT: v_sub_f16_sdwa v4, v1, v3 dst_sel:DWORD dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX9-NEXT: v_sub_f16_sdwa v5, v0, v2 dst_sel:DWORD dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX9-NEXT: v_sub_f16_e32 v1, v1, v3
; GFX9-NEXT: v_sub_f16_e32 v0, v0, v2
; GFX9-NEXT: v_lshl_or_b32 v0, v5, 16, v0
; GFX9-NEXT: v_lshl_or_b32 v1, v4, 16, v1
; GFX9-NEXT: s_setpc_b64 s[30:31]
;
; GFX8-LABEL: v_constained_fsub_v4f16_fpexcept_strict:
; GFX8: ; %bb.0:
; GFX8-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX8-NEXT: v_sub_f16_sdwa v4, v1, v3 dst_sel:WORD_1 dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX8-NEXT: v_sub_f16_sdwa v5, v0, v2 dst_sel:WORD_1 dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX8-NEXT: v_sub_f16_e32 v1, v1, v3
; GFX8-NEXT: v_sub_f16_e32 v0, v0, v2
; GFX8-NEXT: v_or_b32_e32 v0, v0, v5
; GFX8-NEXT: v_or_b32_e32 v1, v1, v4
; GFX8-NEXT: s_setpc_b64 s[30:31]
;
; GFX10-LABEL: v_constained_fsub_v4f16_fpexcept_strict:
; GFX10: ; %bb.0:
; GFX10-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GFX10-NEXT: s_waitcnt_vscnt null, 0x0
; GFX10-NEXT: v_sub_f16_e32 v4, v0, v2
; GFX10-NEXT: v_sub_f16_e32 v5, v1, v3
; GFX10-NEXT: v_sub_f16_sdwa v1, v1, v3 dst_sel:DWORD dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX10-NEXT: v_sub_f16_sdwa v0, v0, v2 dst_sel:DWORD dst_unused:UNUSED_PAD src0_sel:WORD_1 src1_sel:WORD_1
; GFX10-NEXT: v_and_b32_e32 v2, 0xffff, v4
; GFX10-NEXT: v_and_b32_e32 v3, 0xffff, v5
; GFX10-NEXT: v_lshl_or_b32 v0, v0, 16, v2
; GFX10-NEXT: v_lshl_or_b32 v1, v1, 16, v3
; GFX10-NEXT: s_setpc_b64 s[30:31]
%val = call <4 x half> @llvm.experimental.constrained.fsub.v4f16(<4 x half> %x, <4 x half> %y, metadata !"round.tonearest", metadata !"fpexcept.strict")
ret <4 x half> %val
}
define amdgpu_ps half @s_constained_fsub_f16_fpexcept_strict(half inreg %x, half inreg %y) #0 {
; GCN-LABEL: s_constained_fsub_f16_fpexcept_strict:
; GCN: ; %bb.0:
; GCN-NEXT: v_mov_b32_e32 v0, s3
; GCN-NEXT: v_sub_f16_e32 v0, s2, v0
; GCN-NEXT: ; return to shader part epilog
;
; GFX10-LABEL: s_constained_fsub_f16_fpexcept_strict:
; GFX10: ; %bb.0:
; GFX10-NEXT: v_sub_f16_e64 v0, s2, s3
; GFX10-NEXT: ; return to shader part epilog
%val = call half @llvm.experimental.constrained.fsub.f16(half %x, half %y, metadata !"round.tonearest", metadata !"fpexcept.strict")
ret half %val
}
define amdgpu_ps <2 x half> @s_constained_fsub_v2f16_fpexcept_strict(<2 x half> inreg %x, <2 x half> inreg %y) #0 {
; GFX9-LABEL: s_constained_fsub_v2f16_fpexcept_strict:
; GFX9: ; %bb.0:
; GFX9-NEXT: s_lshr_b32 s0, s3, 16
; GFX9-NEXT: s_lshr_b32 s1, s2, 16
; GFX9-NEXT: v_mov_b32_e32 v0, s0
; GFX9-NEXT: v_mov_b32_e32 v1, s3
; GFX9-NEXT: v_sub_f16_e32 v0, s1, v0
; GFX9-NEXT: v_sub_f16_e32 v1, s2, v1
; GFX9-NEXT: v_lshl_or_b32 v0, v0, 16, v1
; GFX9-NEXT: ; return to shader part epilog
;
; GFX8-LABEL: s_constained_fsub_v2f16_fpexcept_strict:
; GFX8: ; %bb.0:
; GFX8-NEXT: s_lshr_b32 s0, s3, 16
; GFX8-NEXT: s_lshr_b32 s1, s2, 16
; GFX8-NEXT: v_mov_b32_e32 v0, s0
; GFX8-NEXT: v_mov_b32_e32 v1, s1
; GFX8-NEXT: v_sub_f16_sdwa v0, v1, v0 dst_sel:WORD_1 dst_unused:UNUSED_PAD src0_sel:DWORD src1_sel:DWORD
; GFX8-NEXT: v_mov_b32_e32 v1, s3
; GFX8-NEXT: v_sub_f16_e32 v1, s2, v1
; GFX8-NEXT: v_or_b32_e32 v0, v1, v0
; GFX8-NEXT: ; return to shader part epilog
;
; GFX10-LABEL: s_constained_fsub_v2f16_fpexcept_strict:
; GFX10: ; %bb.0:
; GFX10-NEXT: v_sub_f16_e64 v0, s2, s3
; GFX10-NEXT: s_lshr_b32 s0, s3, 16
; GFX10-NEXT: s_lshr_b32 s1, s2, 16
; GFX10-NEXT: v_sub_f16_e64 v1, s1, s0
; GFX10-NEXT: v_and_b32_e32 v0, 0xffff, v0
; GFX10-NEXT: v_lshl_or_b32 v0, v1, 16, v0
; GFX10-NEXT: ; return to shader part epilog
%val = call <2 x half> @llvm.experimental.constrained.fsub.v2f16(<2 x half> %x, <2 x half> %y, metadata !"round.tonearest", metadata !"fpexcept.strict")
ret <2 x half> %val
}
declare half @llvm.experimental.constrained.fsub.f16(half, half, metadata, metadata) #1
declare <2 x half> @llvm.experimental.constrained.fsub.v2f16(<2 x half>, <2 x half>, metadata, metadata) #1
declare <3 x half> @llvm.experimental.constrained.fsub.v3f16(<3 x half>, <3 x half>, metadata, metadata) #1
declare <4 x half> @llvm.experimental.constrained.fsub.v4f16(<4 x half>, <4 x half>, metadata, metadata) #1
attributes #0 = { strictfp }
attributes #1 = { inaccessiblememonly nounwind willreturn }
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