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llvm-project/llvm/test/CodeGen/PowerPC/read-set-flm.ll
Chen Zheng eb7d16ea25 [PowerPC] make expensive mflr be away from its user in the function prologue 
mflr is kind of expensive on Power version smaller than 10, so we should
schedule the store for the mflr's def away from mflr.

In epilogue, the expensive mtlr has no user for its def, so it doesn't
matter that the load and the mtlr are back-to-back.

Reviewed By: RolandF

Differential Revision: https://reviews.llvm.org/D137423
2022-11-14 21:14:20 -05:00

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5.7 KiB
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple powerpc64le-unknown-linux | FileCheck %s
; RUN: llc < %s -mtriple powerpc64le-unknown-linux -debug-only=machine-scheduler \
; RUN: 2>&1 | FileCheck %s --check-prefix=LOG
; REQUIRES: asserts
define double @in_nostrict(double %a, double %b, double %c, double %d) {
; CHECK-LABEL: in_nostrict:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: mffs 0
; CHECK-NEXT: xsdivdp 1, 1, 2
; CHECK-NEXT: xsadddp 1, 1, 3
; CHECK-NEXT: xsadddp 0, 1, 0
; CHECK-NEXT: mtfsf 255, 4
; CHECK-NEXT: xsdivdp 1, 3, 4
; CHECK-NEXT: xsadddp 1, 1, 2
; CHECK-NEXT: xsadddp 1, 0, 1
; CHECK-NEXT: blr
;
; LOG: *** MI Scheduling ***
; LOG-NEXT: in_nostrict:%bb.0 entry
; LOG: ExitSU: MTFSF 255, %{{[0-9]+}}:f8rc, 0, 0
; LOG: *** MI Scheduling ***
; LOG-NEXT: in_nostrict:%bb.0 entry
; LOG: ExitSU: %{{[0-9]+}}:f8rc = MFFS implicit $rm
;
; LOG: *** MI Scheduling ***
; LOG-NEXT: in_nostrict:%bb.0 entry
; LOG: ExitSU: MTFSF 255, renamable $f{{[0-9]+}}, 0, 0
entry:
%0 = tail call double @llvm.ppc.readflm()
%1 = fdiv double %a, %b
%2 = fadd double %1, %c
%3 = fadd double %2, %0
call double @llvm.ppc.setflm(double %d)
%5 = fdiv double %c, %d
%6 = fadd double %5, %b
%7 = fadd double %3, %6
ret double %7
}
define double @in_strict(double %a, double %b, double %c, double %d) #0 {
; CHECK-LABEL: in_strict:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: mffs 0
; CHECK-NEXT: xsdivdp 1, 1, 2
; CHECK-NEXT: xsadddp 1, 1, 3
; CHECK-NEXT: xsadddp 0, 1, 0
; CHECK-NEXT: mtfsf 255, 4
; CHECK-NEXT: xsdivdp 1, 3, 4
; CHECK-NEXT: xsadddp 1, 1, 2
; CHECK-NEXT: xsadddp 1, 0, 1
; CHECK-NEXT: blr
;
; LOG: ***** MI Scheduling *****
; LOG-NEXT: in_strict:%bb.0 entry
; LOG: ExitSU: MTFSF 255, %{{[0-9]+}}:f8rc, 0, 0
; LOG: ***** MI Scheduling *****
; LOG-NEXT: in_strict:%bb.0 entry
; LOG: ExitSU: %{{[0-9]+}}:f8rc = MFFS implicit $rm
;
; LOG: ***** MI Scheduling *****
; LOG-NEXT: in_strict:%bb.0 entry
; LOG: ExitSU: MTFSF 255, renamable $f{{[0-9]+}}, 0, 0
entry:
%0 = tail call double @llvm.ppc.readflm()
%1 = call double @llvm.experimental.constrained.fdiv.f64(double %a, double %b, metadata !"round.dynamic", metadata !"fpexcept.strict") #0
%2 = call double @llvm.experimental.constrained.fadd.f64(double %1, double %c, metadata !"round.dynamic", metadata !"fpexcept.strict") #0
%3 = call double @llvm.experimental.constrained.fadd.f64(double %2, double %0, metadata !"round.dynamic", metadata !"fpexcept.strict") #0
call double @llvm.ppc.setflm(double %d)
%5 = call double @llvm.experimental.constrained.fdiv.f64(double %c, double %d, metadata !"round.dynamic", metadata !"fpexcept.strict") #0
%6 = call double @llvm.experimental.constrained.fadd.f64(double %5, double %b, metadata !"round.dynamic", metadata !"fpexcept.strict") #0
%7 = call double @llvm.experimental.constrained.fadd.f64(double %3, double %6, metadata !"round.dynamic", metadata !"fpexcept.strict") #0
ret double %7
}
define void @cse_nomerge(ptr %f1, ptr %f2, double %f3) #0 {
; CHECK-LABEL: cse_nomerge:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: mflr 0
; CHECK-NEXT: .cfi_def_cfa_offset 64
; CHECK-NEXT: .cfi_offset lr, 16
; CHECK-NEXT: .cfi_offset r30, -24
; CHECK-NEXT: .cfi_offset f31, -8
; CHECK-NEXT: std 30, -24(1) # 8-byte Folded Spill
; CHECK-NEXT: stfd 31, -8(1) # 8-byte Folded Spill
; CHECK-NEXT: stdu 1, -64(1)
; CHECK-NEXT: std 0, 80(1)
; CHECK-NEXT: fmr 31, 1
; CHECK-NEXT: mr 30, 4
; CHECK-NEXT: mffs 0
; CHECK-NEXT: stfd 0, 0(3)
; CHECK-NEXT: bl effect_func
; CHECK-NEXT: nop
; CHECK-NEXT: mffs 0
; CHECK-NEXT: stfd 0, 0(30)
; CHECK-NEXT: mtfsf 255, 31
; CHECK-NEXT: addi 1, 1, 64
; CHECK-NEXT: ld 0, 16(1)
; CHECK-NEXT: lfd 31, -8(1) # 8-byte Folded Reload
; CHECK-NEXT: ld 30, -24(1) # 8-byte Folded Reload
; CHECK-NEXT: mtlr 0
; CHECK-NEXT: blr
entry:
%0 = call double @llvm.ppc.readflm()
store double %0, ptr %f1, align 8
call void @effect_func()
%1 = call double @llvm.ppc.readflm()
store double %1, ptr %f2, align 8
%2 = call contract double @llvm.ppc.setflm(double %f3)
ret void
}
define void @cse_nomerge_readonly(ptr %f1, ptr %f2, double %f3) #0 {
; CHECK-LABEL: cse_nomerge_readonly:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: mflr 0
; CHECK-NEXT: .cfi_def_cfa_offset 64
; CHECK-NEXT: .cfi_offset lr, 16
; CHECK-NEXT: .cfi_offset r30, -24
; CHECK-NEXT: .cfi_offset f31, -8
; CHECK-NEXT: std 30, -24(1) # 8-byte Folded Spill
; CHECK-NEXT: stfd 31, -8(1) # 8-byte Folded Spill
; CHECK-NEXT: stdu 1, -64(1)
; CHECK-NEXT: std 0, 80(1)
; CHECK-NEXT: fmr 31, 1
; CHECK-NEXT: mr 30, 4
; CHECK-NEXT: mffs 0
; CHECK-NEXT: stfd 0, 0(3)
; CHECK-NEXT: bl readonly_func
; CHECK-NEXT: nop
; CHECK-NEXT: mffs 0
; CHECK-NEXT: stfd 0, 0(30)
; CHECK-NEXT: mtfsf 255, 31
; CHECK-NEXT: addi 1, 1, 64
; CHECK-NEXT: ld 0, 16(1)
; CHECK-NEXT: lfd 31, -8(1) # 8-byte Folded Reload
; CHECK-NEXT: ld 30, -24(1) # 8-byte Folded Reload
; CHECK-NEXT: mtlr 0
; CHECK-NEXT: blr
entry:
%0 = call double @llvm.ppc.readflm()
store double %0, ptr %f1, align 8
call void @readonly_func()
%1 = call double @llvm.ppc.readflm()
store double %1, ptr %f2, align 8
%2 = call contract double @llvm.ppc.setflm(double %f3)
ret void
}
declare void @effect_func()
declare void @readonly_func() #1
declare double @llvm.ppc.readflm()
declare double @llvm.ppc.setflm(double)
declare double @llvm.experimental.constrained.fadd.f64(double, double, metadata, metadata)
declare double @llvm.experimental.constrained.fdiv.f64(double, double, metadata, metadata)
attributes #0 = { strictfp }
attributes #1 = { readonly }
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