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i remember thinking to myself, i don't need to handle this case, it should never happen... i was wrong

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This commit is contained in:
thijs
2021-02-04 15:57:39 +01:00
parent d272841a3d
commit b4873c19f6
4 changed files with 126 additions and 114 deletions
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SRC/claqr5.f
+32 -30
View File
@@ -462,37 +462,39 @@
* . is zero (as done here) is traditional but probably
* . unnecessary. ====
*
IF( H( K+1, K ).NE.ZERO ) THEN
TST1 = CABS1( H( K, K ) ) + CABS1( H( K+1, K+1 ) )
IF( TST1.EQ.RZERO ) THEN
IF( K.GE.KTOP+1 )
$ TST1 = TST1 + CABS1( H( K, K-1 ) )
IF( K.GE.KTOP+2 )
$ TST1 = TST1 + CABS1( H( K, K-2 ) )
IF( K.GE.KTOP+3 )
$ TST1 = TST1 + CABS1( H( K, K-3 ) )
IF( K.LE.KBOT-2 )
$ TST1 = TST1 + CABS1( H( K+2, K+1 ) )
IF( K.LE.KBOT-3 )
$ TST1 = TST1 + CABS1( H( K+3, K+1 ) )
IF( K.LE.KBOT-4 )
$ TST1 = TST1 + CABS1( H( K+4, K+1 ) )
END IF
IF( CABS1( H( K+1, K ) ).LE.MAX( SMLNUM, ULP*TST1 ) )
$ THEN
H12 = MAX( CABS1( H( K+1, K ) ),
$ CABS1( H( K, K+1 ) ) )
H21 = MIN( CABS1( H( K+1, K ) ),
$ CABS1( H( K, K+1 ) ) )
H11 = MAX( CABS1( H( K+1, K+1 ) ),
$ CABS1( H( K, K )-H( K+1, K+1 ) ) )
H22 = MIN( CABS1( H( K+1, K+1 ) ),
$ CABS1( H( K, K )-H( K+1, K+1 ) ) )
SCL = H11 + H12
TST2 = H22*( H11 / SCL )
IF( K.GE.KTOP) THEN
IF( H( K+1, K ).NE.ZERO ) THEN
TST1 = CABS1( H( K, K ) ) + CABS1( H( K+1, K+1 ) )
IF( TST1.EQ.RZERO ) THEN
IF( K.GE.KTOP+1 )
$ TST1 = TST1 + CABS1( H( K, K-1 ) )
IF( K.GE.KTOP+2 )
$ TST1 = TST1 + CABS1( H( K, K-2 ) )
IF( K.GE.KTOP+3 )
$ TST1 = TST1 + CABS1( H( K, K-3 ) )
IF( K.LE.KBOT-2 )
$ TST1 = TST1 + CABS1( H( K+2, K+1 ) )
IF( K.LE.KBOT-3 )
$ TST1 = TST1 + CABS1( H( K+3, K+1 ) )
IF( K.LE.KBOT-4 )
$ TST1 = TST1 + CABS1( H( K+4, K+1 ) )
END IF
IF( CABS1( H( K+1, K ) )
$ .LE.MAX( SMLNUM, ULP*TST1 ) ) THEN
H12 = MAX( CABS1( H( K+1, K ) ),
$ CABS1( H( K, K+1 ) ) )
H21 = MIN( CABS1( H( K+1, K ) ),
$ CABS1( H( K, K+1 ) ) )
H11 = MAX( CABS1( H( K+1, K+1 ) ),
$ CABS1( H( K, K )-H( K+1, K+1 ) ) )
H22 = MIN( CABS1( H( K+1, K+1 ) ),
$ CABS1( H( K, K )-H( K+1, K+1 ) ) )
SCL = H11 + H12
TST2 = H22*( H11 / SCL )
*
IF( TST2.EQ.RZERO .OR. H21*( H12 / SCL ).LE.
$ MAX( SMLNUM, ULP*TST2 ) )H( K+1, K ) = ZERO
IF( TST2.EQ.RZERO .OR. H21*( H12 / SCL ).LE.
$ MAX( SMLNUM, ULP*TST2 ) )H( K+1, K ) = ZERO
END IF
END IF
END IF
*
SRC/dlaqr5.f
+33 -29
View File
@@ -483,36 +483,40 @@
* . is zero (as done here) is traditional but probably
* . unnecessary. ====
*
IF( K.GE.KTOP .AND. H( K+1, K ).NE.ZERO ) THEN
TST1 = ABS( H( K, K ) ) + ABS( H( K+1, K+1 ) )
IF( TST1.EQ.ZERO ) THEN
IF( K.GE.KTOP+1 )
$ TST1 = TST1 + ABS( H( K, K-1 ) )
IF( K.GE.KTOP+2 )
$ TST1 = TST1 + ABS( H( K, K-2 ) )
IF( K.GE.KTOP+3 )
$ TST1 = TST1 + ABS( H( K, K-3 ) )
IF( K.LE.KBOT-2 )
$ TST1 = TST1 + ABS( H( K+2, K+1 ) )
IF( K.LE.KBOT-3 )
$ TST1 = TST1 + ABS( H( K+3, K+1 ) )
IF( K.LE.KBOT-4 )
$ TST1 = TST1 + ABS( H( K+4, K+1 ) )
END IF
IF( ABS( H( K+1, K ) ).LE.MAX( SMLNUM, ULP*TST1 ) )
$ THEN
H12 = MAX( ABS( H( K+1, K ) ), ABS( H( K, K+1 ) ) )
H21 = MIN( ABS( H( K+1, K ) ), ABS( H( K, K+1 ) ) )
H11 = MAX( ABS( H( K+1, K+1 ) ),
$ ABS( H( K, K )-H( K+1, K+1 ) ) )
H22 = MIN( ABS( H( K+1, K+1 ) ),
$ ABS( H( K, K )-H( K+1, K+1 ) ) )
SCL = H11 + H12
TST2 = H22*( H11 / SCL )
IF( K.GE.KTOP ) THEN
IF( H( K+1, K ).NE.ZERO ) THEN
TST1 = ABS( H( K, K ) ) + ABS( H( K+1, K+1 ) )
IF( TST1.EQ.ZERO ) THEN
IF( K.GE.KTOP+1 )
$ TST1 = TST1 + ABS( H( K, K-1 ) )
IF( K.GE.KTOP+2 )
$ TST1 = TST1 + ABS( H( K, K-2 ) )
IF( K.GE.KTOP+3 )
$ TST1 = TST1 + ABS( H( K, K-3 ) )
IF( K.LE.KBOT-2 )
$ TST1 = TST1 + ABS( H( K+2, K+1 ) )
IF( K.LE.KBOT-3 )
$ TST1 = TST1 + ABS( H( K+3, K+1 ) )
IF( K.LE.KBOT-4 )
$ TST1 = TST1 + ABS( H( K+4, K+1 ) )
END IF
IF( ABS( H( K+1, K ) )
$ .LE.MAX( SMLNUM, ULP*TST1 ) ) THEN
H12 = MAX( ABS( H( K+1, K ) ),
$ ABS( H( K, K+1 ) ) )
H21 = MIN( ABS( H( K+1, K ) ),
$ ABS( H( K, K+1 ) ) )
H11 = MAX( ABS( H( K+1, K+1 ) ),
$ ABS( H( K, K )-H( K+1, K+1 ) ) )
H22 = MIN( ABS( H( K+1, K+1 ) ),
$ ABS( H( K, K )-H( K+1, K+1 ) ) )
SCL = H11 + H12
TST2 = H22*( H11 / SCL )
*
IF( TST2.EQ.ZERO .OR. H21*( H12 / SCL ).LE.
$ MAX( SMLNUM, ULP*TST2 ) ) THEN
H( K+1, K ) = ZERO
IF( TST2.EQ.ZERO .OR. H21*( H12 / SCL ).LE.
$ MAX( SMLNUM, ULP*TST2 ) ) THEN
H( K+1, K ) = ZERO
END IF
END IF
END IF
END IF
SRC/slaqr5.f
+33 -29
View File
@@ -483,36 +483,40 @@
* . is zero (as done here) is traditional but probably
* . unnecessary. ====
*
IF( K.GE.KTOP .AND. H( K+1, K ).NE.ZERO ) THEN
TST1 = ABS( H( K, K ) ) + ABS( H( K+1, K+1 ) )
IF( TST1.EQ.ZERO ) THEN
IF( K.GE.KTOP+1 )
$ TST1 = TST1 + ABS( H( K, K-1 ) )
IF( K.GE.KTOP+2 )
$ TST1 = TST1 + ABS( H( K, K-2 ) )
IF( K.GE.KTOP+3 )
$ TST1 = TST1 + ABS( H( K, K-3 ) )
IF( K.LE.KBOT-2 )
$ TST1 = TST1 + ABS( H( K+2, K+1 ) )
IF( K.LE.KBOT-3 )
$ TST1 = TST1 + ABS( H( K+3, K+1 ) )
IF( K.LE.KBOT-4 )
$ TST1 = TST1 + ABS( H( K+4, K+1 ) )
END IF
IF( ABS( H( K+1, K ) ).LE.MAX( SMLNUM, ULP*TST1 ) )
$ THEN
H12 = MAX( ABS( H( K+1, K ) ), ABS( H( K, K+1 ) ) )
H21 = MIN( ABS( H( K+1, K ) ), ABS( H( K, K+1 ) ) )
H11 = MAX( ABS( H( K+1, K+1 ) ),
$ ABS( H( K, K )-H( K+1, K+1 ) ) )
H22 = MIN( ABS( H( K+1, K+1 ) ),
$ ABS( H( K, K )-H( K+1, K+1 ) ) )
SCL = H11 + H12
TST2 = H22*( H11 / SCL )
IF( K.GE.KTOP ) THEN
IF( H( K+1, K ).NE.ZERO ) THEN
TST1 = ABS( H( K, K ) ) + ABS( H( K+1, K+1 ) )
IF( TST1.EQ.ZERO ) THEN
IF( K.GE.KTOP+1 )
$ TST1 = TST1 + ABS( H( K, K-1 ) )
IF( K.GE.KTOP+2 )
$ TST1 = TST1 + ABS( H( K, K-2 ) )
IF( K.GE.KTOP+3 )
$ TST1 = TST1 + ABS( H( K, K-3 ) )
IF( K.LE.KBOT-2 )
$ TST1 = TST1 + ABS( H( K+2, K+1 ) )
IF( K.LE.KBOT-3 )
$ TST1 = TST1 + ABS( H( K+3, K+1 ) )
IF( K.LE.KBOT-4 )
$ TST1 = TST1 + ABS( H( K+4, K+1 ) )
END IF
IF( ABS( H( K+1, K ) ).LE.MAX( SMLNUM, ULP*TST1 ) )
$ THEN
H12 = MAX( ABS( H( K+1, K ) ),
$ ABS( H( K, K+1 ) ) )
H21 = MIN( ABS( H( K+1, K ) ),
$ ABS( H( K, K+1 ) ) )
H11 = MAX( ABS( H( K+1, K+1 ) ),
$ ABS( H( K, K )-H( K+1, K+1 ) ) )
H22 = MIN( ABS( H( K+1, K+1 ) ),
$ ABS( H( K, K )-H( K+1, K+1 ) ) )
SCL = H11 + H12
TST2 = H22*( H11 / SCL )
*
IF( TST2.EQ.ZERO .OR. H21*( H12 / SCL ).LE.
$ MAX( SMLNUM, ULP*TST2 ) ) THEN
H( K+1, K ) = ZERO
IF( TST2.EQ.ZERO .OR. H21*( H12 / SCL ).LE.
$ MAX( SMLNUM, ULP*TST2 ) ) THEN
H( K+1, K ) = ZERO
END IF
END IF
END IF
END IF
SRC/zlaqr5.f
+28 -26
View File
@@ -462,37 +462,39 @@
* . is zero (as done here) is traditional but probably
* . unnecessary. ====
*
IF( H( K+1, K ).NE.ZERO ) THEN
TST1 = CABS1( H( K, K ) ) + CABS1( H( K+1, K+1 ) )
IF( TST1.EQ.RZERO ) THEN
IF( K.GE.KTOP+1 )
$ TST1 = TST1 + CABS1( H( K, K-1 ) )
IF( K.GE.KTOP+2 )
$ TST1 = TST1 + CABS1( H( K, K-2 ) )
IF( K.GE.KTOP+3 )
$ TST1 = TST1 + CABS1( H( K, K-3 ) )
IF( K.LE.KBOT-2 )
$ TST1 = TST1 + CABS1( H( K+2, K+1 ) )
IF( K.LE.KBOT-3 )
$ TST1 = TST1 + CABS1( H( K+3, K+1 ) )
IF( K.LE.KBOT-4 )
$ TST1 = TST1 + CABS1( H( K+4, K+1 ) )
END IF
IF( CABS1( H( K+1, K ) ).LE.MAX( SMLNUM, ULP*TST1 ) )
$ THEN
H12 = MAX( CABS1( H( K+1, K ) ),
IF( K.GE.KTOP ) THEN
IF( H( K+1, K ).NE.ZERO ) THEN
TST1 = CABS1( H( K, K ) ) + CABS1( H( K+1, K+1 ) )
IF( TST1.EQ.RZERO ) THEN
IF( K.GE.KTOP+1 )
$ TST1 = TST1 + CABS1( H( K, K-1 ) )
IF( K.GE.KTOP+2 )
$ TST1 = TST1 + CABS1( H( K, K-2 ) )
IF( K.GE.KTOP+3 )
$ TST1 = TST1 + CABS1( H( K, K-3 ) )
IF( K.LE.KBOT-2 )
$ TST1 = TST1 + CABS1( H( K+2, K+1 ) )
IF( K.LE.KBOT-3 )
$ TST1 = TST1 + CABS1( H( K+3, K+1 ) )
IF( K.LE.KBOT-4 )
$ TST1 = TST1 + CABS1( H( K+4, K+1 ) )
END IF
IF( CABS1( H( K+1, K ) )
$ .LE.MAX( SMLNUM, ULP*TST1 ) ) THEN
H12 = MAX( CABS1( H( K+1, K ) ),
$ CABS1( H( K, K+1 ) ) )
H21 = MIN( CABS1( H( K+1, K ) ),
H21 = MIN( CABS1( H( K+1, K ) ),
$ CABS1( H( K, K+1 ) ) )
H11 = MAX( CABS1( H( K+1, K+1 ) ),
H11 = MAX( CABS1( H( K+1, K+1 ) ),
$ CABS1( H( K, K )-H( K+1, K+1 ) ) )
H22 = MIN( CABS1( H( K+1, K+1 ) ),
H22 = MIN( CABS1( H( K+1, K+1 ) ),
$ CABS1( H( K, K )-H( K+1, K+1 ) ) )
SCL = H11 + H12
TST2 = H22*( H11 / SCL )
SCL = H11 + H12
TST2 = H22*( H11 / SCL )
*
IF( TST2.EQ.RZERO .OR. H21*( H12 / SCL ).LE.
$ MAX( SMLNUM, ULP*TST2 ) )H( K+1, K ) = ZERO
IF( TST2.EQ.RZERO .OR. H21*( H12 / SCL ).LE.
$ MAX( SMLNUM, ULP*TST2 ) )H( K+1, K ) = ZERO
END IF
END IF
END IF
*