e6f868cf71
If we need to compare the result of a computation with 0, we can sometimes replace the last instruction in the computation with one that sets the integer condition codes. We can then branch immediately based on the zero-flag instead of having to use an extra compare instruction (a SUBcc instruction). This is only possible if the result of the compare is not used anywhere else and that no other instruction modifies the integer condition codes between the time the result of the computation is defined and the time it is used. --------- Co-authored-by: Daniel Cederman <cederman@gaisler.com>
84 lines
2.8 KiB
LLVM
84 lines
2.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=sparcv9 -verify-machineinstrs < %s | FileCheck %s --check-prefix=V9
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define fp128 @f128_select_soft(fp128 %a, fp128 %b) #0 {
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; V9-LABEL: f128_select_soft:
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; V9: .cfi_startproc
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; V9-NEXT: ! %bb.0: ! %entry
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; V9-NEXT: add %sp, -144, %sp
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; V9-NEXT: .cfi_def_cfa_register %fp
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; V9-NEXT: .cfi_window_save
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; V9-NEXT: .cfi_register %o7, %i7
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; V9-NEXT: add %sp, 2175, %o0
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; V9-NEXT: or %o0, 8, %o0
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; V9-NEXT: std %f6, [%o0]
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; V9-NEXT: std %f4, [%sp+2175]
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; V9-NEXT: ldx [%o0], %o0
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; V9-NEXT: ldx [%sp+2175], %o1
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; V9-NEXT: sethi 0, %o2
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; V9-NEXT: or %o2, 0, %o2
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; V9-NEXT: sethi 2097152, %o3
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; V9-NEXT: or %o3, 0, %o3
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; V9-NEXT: sllx %o3, 32, %o3
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; V9-NEXT: or %o3, %o2, %o2
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; V9-NEXT: xor %o1, %o2, %o1
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; V9-NEXT: orcc %o0, %o1, %g0
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; V9-NEXT: bne %xcc, .LBB0_2
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; V9-NEXT: nop
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; V9-NEXT: ! %bb.1:
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; V9-NEXT: sethi %h44(.LCPI0_0), %o0
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; V9-NEXT: add %o0, %m44(.LCPI0_0), %o0
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; V9-NEXT: sllx %o0, 12, %o0
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; V9-NEXT: ldd [%o0+%l44(.LCPI0_0)], %f0
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; V9-NEXT: add %o0, %l44(.LCPI0_0), %o0
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; V9-NEXT: ldd [%o0+8], %f2
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; V9-NEXT: .LBB0_2: ! %entry
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; V9-NEXT: retl
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; V9-NEXT: add %sp, 144, %sp
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entry:
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%0 = bitcast fp128 %b to i128
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%xor.i = xor i128 %0, 0
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%cmp19.i = icmp eq i128 %xor.i, -170141183460469231731687303715884105728
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%spec.select277.i = select i1 %cmp19.i, fp128 0xL00000000000000007FFF800000000000, fp128 %a
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ret fp128 %spec.select277.i
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}
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define fp128 @f128_select_hard(fp128 %a, fp128 %b) #1 {
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; V9-LABEL: f128_select_hard:
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; V9: .cfi_startproc
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; V9-NEXT: ! %bb.0: ! %entry
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; V9-NEXT: add %sp, -144, %sp
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; V9-NEXT: .cfi_def_cfa_register %fp
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; V9-NEXT: .cfi_window_save
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; V9-NEXT: .cfi_register %o7, %i7
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; V9-NEXT: stq %f4, [%sp+2175]
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; V9-NEXT: add %sp, 2175, %o0
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; V9-NEXT: or %o0, 8, %o0
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; V9-NEXT: ldx [%o0], %o0
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; V9-NEXT: ldx [%sp+2175], %o1
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; V9-NEXT: sethi 0, %o2
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; V9-NEXT: or %o2, 0, %o2
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; V9-NEXT: sethi %h44(.LCPI1_0), %o3
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; V9-NEXT: add %o3, %m44(.LCPI1_0), %o3
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; V9-NEXT: sllx %o3, 12, %o3
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; V9-NEXT: ldq [%o3+%l44(.LCPI1_0)], %f4
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; V9-NEXT: sethi 2097152, %o3
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; V9-NEXT: or %o3, 0, %o3
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; V9-NEXT: sllx %o3, 32, %o3
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; V9-NEXT: or %o3, %o2, %o2
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; V9-NEXT: xor %o1, %o2, %o1
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; V9-NEXT: or %o0, %o1, %o0
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; V9-NEXT: fmovrqz %o0, %f4, %f0
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; V9-NEXT: retl
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; V9-NEXT: add %sp, 144, %sp
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entry:
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%0 = bitcast fp128 %b to i128
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%xor.i = xor i128 %0, 0
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%cmp19.i = icmp eq i128 %xor.i, -170141183460469231731687303715884105728
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%spec.select277.i = select i1 %cmp19.i, fp128 0xL00000000000000007FFF800000000000, fp128 %a
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ret fp128 %spec.select277.i
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}
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attributes #0 = { "target-features"="-hard-quad-float" }
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attributes #1 = { "target-features"="+hard-quad-float" }
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